User talk:Redtitan

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I'm fairly inactive here due to limited time, but I plan on updating many of my US state specific maps with the newly released OSU PRISM data for the 1991-2020 period. Redtitan (talk) 09:01, 24 December 2021 (UTC)[reply]

Important note!: Are you here about a complaint or concern about one of my Köppen climate classification maps?

Please see my User Page, where I have an in-depth Frequently Asked Questions section which will very likely address your concerns.

Please be assured, I've done all I could to make them as accurate as I can - using the tools I have available to me - and I take a lot of pride in them.

If you have any more concerns after having read what I've written in the FAQ, feel free to post them here. Thank you!

File:Grandmound womenssuffrage.jpg[edit]

File:Grandmound womenssuffrage.jpg has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

EugeneZelenko (talk) 14:08, 11 July 2016 (UTC) [reply]

Colombia Koppen climate map[edit]

First, I greatly appreciate your contributions to Wikipedia, map makers are very valuable here. Please add a Colombia climate map, because the one we have right now is very inaccurate. Thanks! — Preceding unsigned comment added by Aldiazmo (talk • contribs) 02:11, 16 October 2016 (UTC)[reply]

@Aldiazmo: Sure, I'll plan to make one soon. The quality and accuracy of the map I make will depend on the accuracy of the dataset I'm using (from, so hopefully, Colombia will have good data coverage. If the map I make looks inaccurate, let me know and we can revert it to the current map, in case it's more accurate. Redtitan (talk) 20:15, 16 October 2016 (UTC)[reply]
@Aldiazmo: Hi, just finished the map for Columbia. Does this look accurate?
Köppen climate types of Colombia

Thank you! This is a really good map, it is accurate for the most part and very detailed. Only a few points; the Tatacoa region is a BSh or BWh and Sachica municipality is closer to BSk; bordering it would be would be CSb or CSa, I think. How do you go about making these maps? --Aldiazmo (talk) 21:01, 24 October 2016 (UTC)[reply]

@Aldiazmo: You're welcome - I use GIS to generate the maps. I'm using raster files from, which have climate data embedded in each pixel. Basically, what I do is use a complex set of code in the program to classify each pixel based on the climate data for each pixel.

The climate data I use has a precision of less than 1 sq. km., so it ends up producing a very finely detailed map (it can take a few hours to process a single map). Unfortunately, there's no way to change the data I'm working with, so if the climate types are off from what is expected, there's no way to easily change it. Thankfully, the data seems to be working better than the old maps, based on Peel etc al.'s data., so the maps I'm making so far seem to be improvements. Redtitan (talk) 21:59, 24 October 2016 (UTC)[reply]

Ontario Koppen climate map[edit]

Please add the Ontario climate map by Koppen because I want to see the region of climate I am on.--2607:FEA8:A29F:FDEE:69C0:FE90:89D5:EC90 22:14, 3 August 2016 (UTC)[reply]

Will do! It'll be the next one I make. Redtitan (talk) 07:13, 8 August 2016 (UTC)[reply]

Bad news, someone has been reverting your edits and put the old, less detailed maps such as this: --2607:FEA8:A29F:FDEE:B8C0:AE77:CC32:330F 01:13, 9 August 2016 (UTC)[reply]

Yep, I noticed that . . . Ontario map might be a bit delayed now, but I'll promise I'll get to it! Hopefully by this week. Redtitan (talk) 04:39, 9 August 2016 (UTC)[reply]
Also, glad you like my maps! I'm planning to do all of Canada. Redtitan (talk) 05:57, 9 August 2016 (UTC)[reply]
Looks issue with the map reversions was that my original maps were in PNG format and not the preferred SVG format. I've since made SVG versions and have put most of them back up, and it really is a more versatile file format. I'm hoping if there's any additional issues, I'm hoping I can discuss them with the guy doing the reversions. Redtitan (talk) 21:06, 9 August 2016 (UTC)[reply]
Ontario map is done: Redtitan (talk) 08:00, 10 August 2016 (UTC)[reply]
Köppen climate types of Ontario
Just my note that your work is appreciated. I don't know much about Koeppen climate maps, etc, but map-makers are a valued resource for us at Commons. If I may note, however, please use the most specific categories for your files going forward, when possible, such as what I did with this edit. I'll be going through your other recent uploads (as I did with the previous PNG Koeppen maps) and updating them as well. Let me know if there are any questions. Huntster (t @ c) 00:06, 10 August 2016 (UTC)[reply]
Thanks for the note! I'll make sure to do that from now on for any maps I upload. Redtitan (talk) 00:17, 10 August 2016 (UTC)[reply]

Sorry for the misconception[edit]

Hello dear Redtitan. Just wanted to say sorry for my misconception. I didn't really know you calculated all that data. Did you done them with a software? Ali Zifan 04:24, 10 August 2016 (UTC)[reply]

No worries - Yep, I used GIS software to run the Koeppen type calculations. QGIS is a great free open-source GIS software, if you're interested in using GIS for mapmaking. There's some great tutorials online. Redtitan (talk) 04:27, 10 August 2016 (UTC)[reply]
Thanks! Ali Zifan 04:29, 10 August 2016 (UTC)[reply]

World Koppen map[edit]

Can you please make a world Koppen climate map? Thanks. —Preceding unsigned comment was added by (talk) 00:01, 02 September 2016 (UTC)\[reply]

I would, but I'm afraid my computer doesn't have the processing power to calculate Koppen types for the whole world, and it just freezes up. If I get enough coutnries, however, then I could put together a world map that way. 02:12, 2 September 2016 (UTC)[reply]

File:Greece's Köppen Climate Types Peel et al. (2007).png[edit]

File:Greece's Köppen Climate Types Peel et al. (2007).png has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

Artoxx (talk) 10:23, 25 September 2016 (UTC) [reply]

Opinion on existing map of Mexico[edit]

Mapa de México con la Clasificación Climática de Köppen.png

Hi @Redtitan: , I wanted to know what your opinion on the existing Koppen map of Mexico was- it is very detailed, but the uploader (User:JavierRA) does not give a source for the climate info. From my knowledge, it seems accurate but we still need a source. Doing some searching, the creator of the map seems to be a user on I'm not convinced that the upload is a copyright violation: the original post there was made June 2015 with map upload to commons being in November 2015, yet the origin address for the pic on that site is for Wikimedia Commons; the user also posts other detailed climate maps in that thread, including a similar map with the states outlined, which seem to be made by them. (no other pics are hosted on Commons)

Your climate maps are beautiful, would you be willing to create a map of Mexico in case the existing one is deleted? I will try to contact the user on that site and see if they can provide a source for the climate data. AuroralColibri (talk) 20:57, 21 October 2016 (UTC)[reply]


          Hi @Redtitan:  & @AuroralColibri: ...  I've seen your maps Redtitan, and they look awsome, nice work...   I have a doubt with the US maps that have been posted everywhere, In my data files I've seen there's a strip at the most western side of the Cfa climate, where at least a month in winter has less than 30mm, and that makes it a Cwa climate...     

           I also would be willing you can create a  map of Mexico with that accuracy that you make your maps... Thanks a lot.   (talk)

@JavierRA: @AuroralColibri: Hello, thanks for the compliments. I saw your map previously and was very impressed with the quality - it's great to see other raster climate maps here on Wikipedia.
I was surprised to see the strip of Cwa along the eastern boundary of the Cfa zone in the southeastern United States in your climate map of Mexico. As you've seen, my maps have the Cfa zone bordering areas of BSk and BSh climate.
Can I ask which source you used to define the 'Cw' climate type? I've never seen 'at least one month in winter <30 mm' as the threshold for qualifying a 'Cw' climate. The definition I've found for 'Cw' is that the wettest summer month must be at least 10 times as wet as the driest winter month. You can find that threshold for 'Cw' listed on the Wikipedia page for the Koeppen climate classification system, and in these two journal articles that I use for sources: (This paper adds an additional requirement that the driest winter month must be drier than the driest summer month)
The closest requirement to the one you mentioned for 'Cw' (at least month <30mm precipitation) would be a for 'Cs' climate, where the driest summer month must be <1/3 as wet as the wettest winter month and also must be below 40 mm precipitation. Some versions of this use a 30 mm threshold for this instead, I think based on Trewartha's modifications of the Koeppen climate classification system. Redtitan (talk) 20:32, 23 October 2016 (UTC)[reply]
I'd be happy to make a map of Mexico next if a replacement map is necessary. I'm currently working on a map for Colombia, and could make a map for Mexico in the next few weeks. It'd be great to stick with the current map if possible. Looks like the two outstanding issues are the lack of attributable data source and a possible error with the calculations for the 'Cw' type.
It looks like you spent a lot of time on your map, and so if it's really difficult to change the Cw area, it'd be no trouble at all for me to calculate up a new Koeppen map. I've got the process streamlined. Doesn't take more than 15 minutes of effort altogether. It's more just finding time for my computer to compute everything, which can take a few hours for a large country like Mexico. I use a dataset from which is accurate <1 sq km, so it comes out really accurate, but the amount of detail can take a bit longer to computer. Redtitan (talk) 22:39, 23 October 2016 (UTC)[reply]

New Koeppen map of Mexico[edit]

@JavierRA: @AuroralColibri: So I had some free time tonight and decided to make a new Koeppen map for Mexico. I read on the talk page for your map, JavierRA, that you used the DIVA-GIS dataset. That ultimately uses data, just with a less detailed resolution (2.5 arcminutes, vs. < 1 sq. km.). So we're working with the same dataset, just slightly different resolutions.

It looks like there are two areas of significant difference between our two maps that I wanted to bring up. The deserts and semi-arid regions came out similar, as did the Af, Aw, and Am regions.

However, there's quite a large difference in the distribution of Cw and Cs climates. I think the difference in Cw is due to the difference in the formulas we both used.

For Cs, I was surprised to see it so widespread in the west of the country. I suspect that has to do with how I calculated that type. One of the quirks of the Koeppen classification scheme has to do with how summer and winter are defined. Summer is considered to be the 'summer half-year', or April to September, while winter is considered to be the 'winter half-year', or October to March.

That can lead to an odd situation where a location has its wettest months from July through September, yet because it has a dry month in spring, it still meets the qualifications for a 'Cs' climate.

Consider Ciudad Madera which is located within a Csb climate zone in my map, in the state of Chihuahua. If you look at its climate on its wiki page (, you can see it fulfills all three of the following requirements for a 'Cs' climate:

1) The driest month in the summer half-year (April-September) must have a monthly precipitation <40 mm.
2) The driest month in the summer half-year must be lower than the driest month in the winter half year (October-March).
3) The driest month in the summer half-year must be less than 1/3 as wet as the wettest month in the winter half year.

(reference for these requirements for 'Cs':

So strangely, even with a maximum in summer precipitation, a dry spring month in April or May can lead to an area being classified as a 'Cs' or dry-summer climate. It's strange, but following the rules of the Koeppen system, that's how it's turning out. Redtitan (talk) 08:08, 25 October 2016 (UTC)[reply]

Mexico koppen


@Redtitan: ...   I'm really surprised with the final map... however I was wondering how you were going to solve one of my biggest problems when doing the map. And I'm somehow disappointed there where no C_c dots.  
 See, in Mexico the official maps, both from universities and government offices use a different classification, they say it's modified to match real climates (translated in actual biomes).  That's why I decided to work on a map with international standards. 
 When I was doing the map I found myself with a lot of crossroads, mainly because they didn't match official classification, or even international maps (like the one you found in the Cs climate) that's why I looked for further sources, like the one that I used for Cw that is quoted in wikipedia: "w indicates dry winters (driest winter month average precipitation less than one-tenth wettest summer month average precipitation; one variation also requires that the driest winter month have less than 30 mm average precipitation)"  I looked for the source that states that the driest winter month should have less than 30mm average precipitation, and I found it (somehow I can't right now).  So I used it in the formula, and suddenly a lot of places matched with the maps I've seen in official papers and sources...  so I stuck with that condition, but then I found a weird situation in the western Sierra,  lots of places didn't match neither with Cw, nor Cs or on the other hand, places where they matched both: Cw and Cs..  so I used the next sentence in order to give it a name: " f means significant precipitation in all seasons (neither above-mentioned set of conditions fulfilled)." as those places, didn't fulfilled any of Cw nor Cs conditions I set them with the f letter, as they have both rain seasons in summer and winter, and both dry seasons in summer and winter.   In the mexican modified formula, almost the whole western sierra is classified with the x' letter, a letter that came out just for national maps.   
 I  was also comparing the mexican biomes that matched certain climate with those in other countries, and I found out a new condition, a different one, that may define high altitude climate for C climates. For example:  Subtropical climates (C_a) with a winter month >10°C might have biomes that may look more like those in tropical climates (say, wide leafs), and Subtropical climates with a winter month <10°C may have biomes that may look more likely to those in temperate climates (say pine or coniferous trees)....   The same will happen to C_b... (talk)— Preceding unsigned comment added by JavierRA (talk • contribs) 16:02, 25 October 2016 (UTC)[reply]
@JavierRA: Hi JavierRA, you're right - there is a sentence later in the Koeppen climate classification article that mentions that there's a variation of Cw having at least one winter month <30 mm. I'm really curious where that came from - the article cites the Peel et al. 2007 article for that section, but that alternative threshold for Cw isn't mentioned anywhere in that journal article. I went all the way back to 2008 in the history for the Koeppen climate classification wiki article and that sentence is still there, but is uncited. Let me know if you can turn up the source that you found - I'd be curious to see it.

I can see one issue with that definition for Cw, and that is that a given location could meet the following criteria:

1) The driest month in the summer half-year (April-September) must have a monthly precipitation <40 mm.
2) The driest month in the summer half-year must be lower than the driest month in the winter half year (October-March).
3) The driest month in the summer half-year must be less than 1/3 as wet as the wettest month in the winter half year.

And also meet the proposed Cw criteria:

1) The driest month in winter must have a monthly precipitation <30 mmm.

Since they're not mutually exclusive, you could end up with areas that match both types - maybe not in Mexico or the U.S., but possibly elsewhere.

The Koeppen climate classification wiki article is unfortunately a bit of a mess. I was referring to the table at the beginning for the Cw definition, which is cited correctly, but there's random bits of uncited material throughout the article that contradicts other parts. I'm hoping sometime to add a table that lists out all the major variations of the Koeppen climate scheme that can be found in the literature. For example, there are definitely differences in the threshold used to distinguish C/D types (-3C or 0C) as well as differences in the formula used to calculate B climates (66% rainfall or 70% of rainfall as threshold in seasons).

It sounds like there might be room for two Mexico Koeppen maps here: one using the most widely used international standards for the Koeppen scheme, and then another using the modified Mexican version of Koeppen that makes the most sense for its biomes.

My goal with my mapmaking is to follow the guidelines of Koeppen completely, regardless of how it makes sense locally. That way, you can compare the map on a global scale and then judge the value of the Koeppen scale. Redtitan (talk) 17:01, 25 October 2016 (UTC)[reply]

GDBarnstar1.png The Graphic Designer's Barnstar
Thank you very much Redtitan for your wonderful climate maps. AuroralColibri (talk) 18:57, 1 November 2016 (UTC)[reply]
@AuroralColibri: Thank you so much! Excited to get my first barnstar. Redtitan (talk) 04:57, 2 November 2016 (UTC)[reply]

Minor error on British Columbia koppen climate map[edit]

You listed all the climates it shows, but I think you forgot one, the hot-summer mediterranean climate. I think around the Vancouver area where it is warm-summer mediterannean I noticed a few dots of some brighter colour. It could also be semi-arid, but considering the average rainfall here, I highly doubt that. Thanks for reading, please edit it if I am right. — Preceding unsigned comment added by Socialistboyy (talk • contribs) 04:40, 31 October 2016 (UTC)[reply]

@Socialistboyy: Hi - I think what you might be seeing are very small white areas where there's lack of climate information. If you compare those areas with Google Maps, those same areas correspond with the branches of the Fraser River within the Fraser River Valley Delta. Thanks to the cooling effect of the coast, Csa (hot-summer mediterranean) doesn't appear on the coast until you get as far south as Los Angeles.
The program I use to generate the maps automatically detects individual pixels and adds them to the map, so if there were any individual pixels anywhere of the map of Csa or for any other time - even just a few of them - it'd automatically add them to the legend. Redtitan (talk) 05:19, 31 October 2016 (UTC)[reply]

Crap, opened it on ms paint and it was indeed white, the colour around it sort of rubbed off making it look light yellow. Sorry Socialistboyy (talk) 10:08, 31 October 2016 (UTC)Socialistboyy[reply]

@Socialistboyy: No worries and thanks for the interest. I definitely do make errors on my maps occasionally, so it's always nice to have an extra pair of eyes out there checking them over in case I do. Redtitan (talk) 17:57, 31 October 2016 (UTC)[reply]

Contact info?[edit]

I love your maps and I don't wanna clog your discussion page with ideas, and comments about your maps, so do you have email, or skype? 04:32, 2 November 2016 (UTC)socialistboyy[reply]

@Socialistboyy: Hi, feel free to post whatever ideas and comments you have on my talk page - I don't mind at all if it gets cluttered, and am excited to hear your thoughts. If you'd like to send me an email though, there should be a link on the left pane titled 'Email this user' when you're on my user page. That goes straight to my email. Redtitan (talk) 04:55, 2 November 2016 (UTC)[reply]

There doesn't seem to be any button of that sort. Anyways, a climate map I'd love to see is one of Morocco, because it has an interesting climate and the existing map of it doesn't look accurate at all. Can you just post your email here? Socialistboyy (talk)socialistboyy

@Socialistboyy: Funny you should ask! I have Morocco next on my list and have it partially done already. I'll have it done shortly. Not to give out a spoiler, but I was curious whether there was any of the rare Csc climate in Morocco, but it appears there is not from the map.
The "Email this User" link is in the left pane. If you scroll all the way up to the top of the page, you'll see a list of links under the Wikimedia Commons Logo. It's in the list of links, under "Tools". I try to keep my email off webpages, since I'm worried I'll get spammed mercilessly from spam bots that scan the internet for email addresses. I made that mistake with my last email address. Redtitan (talk) 15:45, 3 November 2016 (UTC)[reply]
Here's Morocco:
Köppen climate types in Morocco
— Preceding unsigned comment added by Redtitan (talk • contribs) 19:40, 03 November 2016 (UTC)[reply]

Tutorial for climate maps[edit]

Hey, it's great to see you're into this type of maps. I know you follow the guidelines to get the Köppen climate classification of the Meteorologische Zeitschrift publication. I'd like to know if you have any online tutorial to get the climate types. I did one of Venezuela, i think it's ok. But I wanna do one for a temperate country, and it's kinda difficult for me to get the C and D climates... So I'd appreciate if you can explain to me it. (if you need my email, let me know). This is the map I generated for Venezuela, I think it's really accurate!

Koppen Venezuela

--Gabrielsanz (talk) 05:33, 3 November 2016 (UTC)[reply]

@Gabrielsanz: That's a really great map! Well done! Glad to see some other climate map makers on here.
Doing C and D climate types is really complicated, although I've found the B climates to be the hardest though personally - calculating the three separate thresholds for Pth based on the three differing precipitation patterns is really time-intensive and was difficult to piece together at first.
One thing I've yet to do is calculate the 'w', 's', and 'f' subtypes for C and D types in countries spanning the equator. Since those all depend on the timing of precipitation based on the half-year, you end up with different definitions of the half-year for the parts of the country north and south of the equator. It's doable, but would take two sets of calculations for either side of the country. I've kind of stayed away from the equator for that reason and only did Colombia when requested (thankfully, the equator ran through solid 'A' climate type territory for Colombia, so that wasn't an issue). Countries like Ecuador and Kenya look a bit daunting though.
Unfortunately, I don't have a tutorial written up that I could send. I should do that sometime - I'm in graduate school now for GIS and so my time is unfortunately a bit limited. I make a few maps every now and then for fun. Any tutorial I'd make would have to be very long! I developed a very complex series of functions in the GIS program I use to calculate the different types. It's pretty complicated and would be hard to describe (it'd also depend on the mapmaking program you're using, the version of it, and the functions in that particular program). And it'd depend on the country you're trying to calculate. If it had B, C, D, E, and A climates (like the US) it requires a different series of actions than if you have a country with just B, C, D, and A climates, for instance. The code I use changes based on which climate types are present, since some types take primacy over others (E over B, B over C & D, and so on). Hope that makes sense.
Can I ask which program you're using? And also which climatic guidelines? Knowing those two things might be able to help me help you out. Redtitan (talk) 06:07, 3 November 2016 (UTC)[reply]
Thanks a lot for you reply. I use ArcGis 10.2.2 and the climate guidelines the one from Meteorologische Zeitschrift publication. On other hand I really want to congratulate you for those amazing maps you've done. They're a masterpiece and very accurate :) --Gabrielsanz (talk) 21:55, 3 November 2016 (UTC)[reply]
Thanks so much! I appreciate the compliment. It might take me a little while, but I'll try to put together a tutorial for you sometime soon. Redtitan (talk) 16:49, 7 November 2016 (UTC)[reply]
Just chiming in here. I'd love to get your tutorial on this as well. I've been using QGIS and the raster calculator to create climate maps, but I've not been getting the same results as you for Alaska (it's missing out the semi-arid and "s" type climate zones your map shows), so I'm thinking I'm either doing something wrong or missing out a step somewhere. --VulcanTrekkie45 (talk) 19:05, 3 June 2017 (UTC)[reply]

Belarus please?[edit]

I'm doing an assignment on Belarus for school, and a koppen map may help. Thanks for reading Socialistboyy (talk) 02:12, 6 November 2016 (UTC)socialistboyy[reply]

I've already got Belarus 90% done actually. I ran my mapmaking program and did all of Europe. I just need to clip it out, along with the rest of the countries I haven't yet done, and create a map. However - Belarus is admittedly kind of boring. It's solid Dfb on my map. Basically, it'll be an outline of Belarus with a bunch of blue in the middle. Is that alright? I've definitely made climate maps of states/countries that are all just one climate type before. Redtitan (talk) 16:24, 7 November 2016 (UTC)[reply]

CFA climate weirdness?[edit]

Why is New York City classified as subtropical? I know koppen can be weird sometimes, but that makes absolutely no sense. I'm not asking you to change anything, because I know you can't control system weirdness, but can you please explain why koppen would classify somewhere like NYC as subtropical when it obviously isn't? Also, where I live is classified as CFB, yet our winters are more mild than NYC.

So, there's a bunch of layers to this one. New York City, at least the downtown portion, does qualify as Cfa (humid subtropical). There are two thresholds used to separate 'C' and 'D' climates in the Köppen system: the original and more internationally used -3 deg C threshold for lowest average monthly temperature, and a 0 deg C threshold used in the US. (In my maps, even though I'm in the US, I use -3 deg C in an attempt to be neutral and use the most widely accepted standards)
However, even under both of those thresholds, the downtown of NYC qualifies as a Cfa climate. Its coldest month barely ekes out at having an average monthly temp just above 0 deg C. NYC suburbs, however, are definitely below 0 deg C. So under the US Köppen variant, you'll find those labeled as a 'D' climate, whereas in my maps, they're 'C' climates.
So NYC does count as 'Cfa' under the Köppen definition, but what about the 'humid subtropical' label? That's the label that's become associated with the 'Cfa' type. I haven't gone over the original Köppen works (they're in German, and my German is getting rusty), but Trewartha - who tried to update Köppen's work - definitely used that label for his modified Köppen system (he used the 0 threshold for his modified version). However, often the labels given to Köppen types don't always fit the places they're assigned to, especially around the edges. Climate is a spectrum, and we're breaking it up into categories. The places in the middle of the category bounds tend to fit better with the names given to those categories.
You say you live in a Cfb climate. Based on your comment on the BC map and knowing where the most populated parts of Cfb climates are in North America, I gather you might be from the west coast of BC/Vancouver Island area? If so, you would definitely live in an area with milder winters than NYC. Since your area and NYC both have a coldest winter month with an average low greater than -3 C, you get lumped into the 'C' category by Köppen. However, winters with a lowest monthly temperature above -3 deg C are just one of the qualifying features of having a 'Cfa' climate. The 'a' part is another important part of the humid subtropical label: NYC has very hot summers. And so in summer, its humid hot summers truly would feel 'humid' if not, 'humid subtropical'.
The label 'Subtropical' tends to conjure up palm trees and a certain type of landscape that doesn't quite match up with New York. That's mainly due to the frost zones. New York is far enough north that palm trees and other subtropical flora can't take their harsh winters. Oddly enough though, where I live in western Washington state in a Csb climate, people manage to grow palm trees, olive trees, eucalyptus, and other subtropical plants, thanks to our lack of frost - they grow slow, but they don't die. In fact, the tallest palm tree I've seen north of the Oregon-California border was in Victoria, BC.
Hope that all makes sense! Redtitan (talk) 02:49, 8 November 2016 (UTC)[reply]

Thank you for, that very informative. Sorry for bothering you so much, but I have another question. What exactly is the difference between DF_ climates and DW_ climates? On the legends in your picture they both have the exact same description. Please explain? Socialistboyy (talk) 09:55, 8 November 2016 (UTC)socialistboyy[reply]

Sure thing and it's no bother - I like talking about climate. I forgot to mention in my explanation the reason the West coast of North America is so mild compared to the east coast: Seattle is almost as far north of northern Maine and lies further north than even Montreal. Yet it has much milder winters. That's thanks to the warm-water current off-shore - it's kind of the equivalent to what the Gulf Stream does, but this one is in the Pacific and it's not quite as strong. Those are all present on the west side of continents, which is why C climates extend so far north in western North America and in western Europe (you rarely find D climates in the southern hemisphere, so it doesn't quite apply to S. America, Africa, or Australia).
So Df_ and Dw_ climates: Df_ climates have year round precipitation, while Dw_ climates have particularly dry winters. Dw climates are found primarily in Eastern Asia (particularly in Siberia and China), while Df climates are common throughout the east side of continents in the temperate belt.
Many Df_ climates are actually a bit rainier in the summer than the winter (this is actually not too uncommon for Df_ types: look at the climate section for St. Paul, Minnesota and you can see the noticeable increase in summer). Given the high requirements for difference between summer and winter precipitation for an area to qualify as Dw_, the areas with a Dw_ climate tend to be more limited to where the difference is extreme.
I didn't give Dw_ climates unique names because no unique names have sprung up for Dw_. The precipitation low in Dw_ climates is in the winter, and there's low evaporation from those areas in winter, when most vegetation isn't actively growing. Trees have lost their leaves, everything is pretty frozen and brown. And so there isn't as much of a change on the landscape. Whereas, with Ds climates, you have the precipitation low in the summer, when you can have some significant heat. That results in increased evaporation at a time when plants are most active. That has a notable influence on the landscape, and which is why Ds_ climates got a distinct name.
That all being said, there's no standardized naming system in the literature that I could find, so I drew from what I saw already being used here on Wikipedia. Redtitan (talk) 16:31, 8 November 2016 (UTC)[reply]

Makes sense. I think DWA should be "dry-hot-summer humid continental" and so on. Also, I like talking about climate and learning stuff about it to, so if I continue to ask you stuff, would that bother you? EDIT: I do live in Coquitlam, British Columbia, just to note. Also, I think you should make something that lists the criterias for all different climate types, if it's not too hard. Thanks for reading! Oh, yeah, Trump or Clinton? Socialistboyy (talk) 22:31, 8 November 6969 (UTC)socialistboyy[reply]

Clinton. Very much Clinton. Before that Sanders. Proud Cascadian blue-stater here. Redtitan (talk) 04:40, 9 November 2016 (UTC)[reply]

Oh, I'm definitely for Trump, lol, even though I'm Canadian. Where do you plan on making maps of next/ what will be uploaded soon? Socialistboyy (talk) 04:46, 9 November 2016 (UTC)socialistboyy[reply]

Trump, really? With a name like socialistboy? I would've taken you for an NDP supporter. Redtitan (talk) 04:57, 9 November 2016 (UTC)[reply]
Thinking of finishing up parts of Europe next. I have that done - just need to clip individual countries. Redtitan (talk) 04:58, 9 November 2016 (UTC)[reply]

The way I see it is Trump and Hillary are both far-right, except Trump is less corrupt. Your Europe maps are so cool, good luck. Socialistboyy (talk) 18:45, 9 November 2016 (UTC)socialistboyy[reply]

Just realized this morning that I'm losing my healthcare in two months now. I have to give up my mapmaking to find a second job. Enjoy your relative safety in BC. Redtitan (talk) 20:40, 9 November 2016 (UTC)[reply]

Fuck, I didn't even know he was doing that. I thought when he said get rid of obamacare he was going to immidiately replace it with something better. If it makes you feel better, I didn't really know much about the US election. You should start a page where people can donate to you. Socialistboyy (talk) 01:58, 10 November 2016 (UTC)socialistboyy[reply]

Trewartha climate maps.[edit]

Is it possible for you to upload Trewartha climate maps for other areas like Canada, Europe, or more? --2607:FEA8:A29F:FDEE:933:4F71:BC2F:1D72 01:33, 5 December 2016 (UTC)[reply]

I could, although I'm still confused about the Trewartha classification criteria regarding the boundary between Mediterranean and humid subtropical climates. There's an area where I believe it's quite undefined. I erred on the side of humid subtropical for my US map, but now that that's not a citable source, I've considered replacing that with a gray category called 'undefined'. See the talk page of Trewartha climate classification for more details. Redtitan (talk) 22:18, 23 January 2017 (UTC)[reply]


You on? Ever? — Preceding unsigned comment added by Socialistboyy (talk • contribs) 05:52, 12 December 2016 (UTC)[reply]

No, I've taken a break from Wikipedia for the foreseeable future. Redtitan (talk) 22:16, 23 January 2017 (UTC)[reply]

Maps and GIS[edit]

Hi Adam, I've found your page after Russia's climate map, it was 30 min or more ago but I am still amazed by your maps, they are great, awesome and masterpieces. I don't know how you will react but now I have new goal to learn making of climate maps like you, I've read your FAQ and I am ready to spend even a year but I will achieve my goal. I will be very happy (and lucky) if I receive some help from you. I am beginner in GIS and not bad in relief maps (e.g. File:Poti-Tbilisi-Baku Railway Map.svg). I have no idea how long does it take but I'll learn to make similar climate maps, also I can help you with doing this (if it will be needed). I will wait for your response to ask other questions.--g. balaxaZe 20:34, 26 January 2017 (UTC)[reply]

Shoot me a kml file i Google Earth[edit]

Can you please shoot me out a email on with a .kml file please? —Preceding unsigned comment was added by (talk) 23:41, 3 February 2017 (UTC) 23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC)23:41, 3 February 2017 (UTC) —Preceding unsigned comment was added by (talk) 23:41, 3 February 2017 (UTC)[reply]

Climates innacurate of today, I think.[edit]

I live in Coquitlam, British Columbia. I think the daytime climates in summer are generally over 22 degrees celsius. The last few summers I've noticed here is generally between 22-28 degrees. — Preceding unsigned comment added by Socialistboyy (talk • contribs) 03:45, 21 February 2017 (UTC)[reply]

@Socialistboyy: The 22 deg C threshold refers to the mean monthly temperatures (highs and lows averaged). Nighttime temperatures dip down enough in the summer to keep the mean monthly temperature below 22 deg C. Redtitan (talk) 18:29, 5 April 2017 (UTC)[reply]

Ontario and Quebec Map innacurate for sure[edit]

According to the wikipedia article on Toronto the hottest month of July, the average temperature is 22.3 degrees, which would put this in the "hot-summer continental" climate zone, not the warm-summer one. The same thing is with Montreal, which has an average temperature of 22.3 celsius in July. Thanks for reading! There may be other cities that could be innacurate, but I didn't check. --Socialistboyy (talk) 03:28, 2 March 2017 (UTC)socialistboyy[reply]

@Socialistboy: The most up to date data I could find for Canada was for 1960-1990, I believe. So any increases in temperature in recent decades thanks to climate change wouldn't incorporate those changes. Thus, Toronto is shown with a Dfb climate and not Dfa. Hopefully, there will be an updated dataset available and the map can be updated. Redtitan (talk) 18:32, 5 April 2017 (UTC)[reply]

Hey, just saying, if you DO get new data, keep the old maps, just label them as older. It would be nice to see how the world's climate has changed. Thank you. Socialistboyy (talk) 18:08, 25 April 2017 (UTC)socialistboyy[reply]

Official climate types in the Koppen system[edit]

First of all I must tell you that your climate maps based on Koppen system are a useful contribution to wikipedia therefore deserve thanks. These are created with great precision and professionalism and it is evident that they are the result of a great work of research on your part. Obviously I do not think of having to criticize the correctness of the maps or the correspondence of the climate zones with those represented by Koppen. However, the only little big mistake that finding is a semantic error and is important in my view because the words have a very specific meaning, especially if they are read around the world. I refer to the fact that you do not use the original definitions of the Koppen system to define the climate types but a simplified and confused version, born in the american continent, which in recent years has been used on the web by generating understandable controversy. A classic example (not the only) is the label 'humid subtropical' that does not exist in the original classification of Koppen and in all its elaborate versions later by the official climatology that defines the climate type CFA = Humid temperate with hot summer. Probably the label 'humid subtropical' has been confused some years ago with climatic type elaborated by Trewartha but with different criteria than those of Koppen. In fact Trewartha defines the climate zones that have a real subtropical climate, humid or dry. As I said the words have a precise meaning and subtropical literally means next to the tropics. and call subtropical the climate of cities like New York or Washington DC, Milan or Belgrade, seems absurd since they are places situated not at subtropical latitudes (40/45 °) characterized by fairly cold winters that have nothing to do with those of subtropical latitudes (20/35 °) and by hot summers but not to such an extent as to be subtropical where moreover there is a much greater rainfall. Same goes for the vegetation, it is clear that around nyc or milan can not exist tobacco plantations or similar species typical of the subtropics. So I believe that your important graphic contribution should indicate the official descriptions of climate types processed by Official climatology that are known all over the world and should remove simplified and unofficial labels, inappropriate and questionable. Even because what we write on wikipedia is for the people all over the world not only for american people.. Anyway, thanks for your attention and congratulations again for your graphic work. — Preceding unsigned comment added by Swan 73 (talk • contribs) 15:41, 20 March 2017 (UTC)[reply]

@Swan 73: If I were to make the maps again, I think I would have left the accompanying labels out and just listed the abbreviations (e.g. "Csa", "Csb"). I haven't found a full list anywhere of names for each Koppen type that was substantiated in the literature, and there is certainly a huge amount of disagreement over what to call each climate type in English on Wikipedia. Going to the original Koppen papers would require me to translate the names for those types in German, which would constitute an original work on my part (people have criticized me for doing this before). So I'm not sure your proposed method would work, unfortunately.
While I don't feel too strongly about it, I wouldn't be against removing the names from the maps I made and just listing the Koppen type abbreviation. That being said, to go back now and do that would take a few days. I've generally left Wikipedia and am not active on here, and don't feel that the naming situation is crucial to warrant that level of time investment.
Also, I would like to add that I aimed to make my maps as international as possible. I chose to use the -3 deg C threshold between C and D climates, as opposed to the 0 C threshold commonly used in the US. That decision received some disapproval from other American Wikipedians, for instance. I've also received criticism that I haven't used Koppen systems that are specific to the countries I've made maps for, such as Spanish or Greek modifications to the Koppen system. So it appears I can't make everyone happy, which I think might be a good sign that I've been fairly neutral.
If you feel very strongly about this, you're more than welcome to create your own Koppen maps and label them how you like. You can also debate this issue on the talk section of the Koppen page with other Wikipedians. Again, since I've largely left Wikipedia, my mapmaking is on indefinite pause. Redtitan (talk) 18:51, 5 April 2017 (UTC)[reply]

Map of Spain[edit]

Could you delete it? It is wrong and contradicts AEMET. — Preceding unsigned comment added by Inactive user 20171 (talk • contribs) 12:42, 28 March 2017 (UTC)[reply]

@Inactive user 20171: No - I will keep it in place. It may be less accurate, but as the most accurate free alternative to a map that's only available under fair use, it could be useful to people who need a Koppen map of Spain, but are restricted by the Fair Use restrictions on the AEMET map. Redtitan (talk) 19:01, 5 April 2017 (UTC)[reply]

Issue on map, or wikipedia page[edit]

According to wikipedia Honolulu has a semi-arid climate. Your map shows otherwise. Please fix. Thanks. Socialistboyy (talk) 08:15, 7 May 2017 (UTC)socialistboyy[reply]

A barnstar for you![edit]

Team Barnstar Hires.png The Teamwork Barnstar
You have AWESOME Koppen Maps. Keep up your great work! Manualy20 (talk) 02:24, 14 August 2017 (UTC)[reply]

@Manualy20: Thank you! Redtitan (talk) 00:15, 12 September 2017 (UTC)[reply]

Dependent territories and independence referendums[edit]

Would it be nice if you could add dependent territories of countries (e.g. Azores, Madeira, Canary Islands, Ceuta, Melilla, etc.) because most of these country maps are only preferred to the mainland, oh and Catalonia declared independence from Spain.2602:30A:C0FF:A6E0:4D65:697:A4B4:5E4D 23:55, 11 September 2017 (UTC)[reply]

Thanks for the note. The data source I use to calculate my maps (I've actually quit making them several months ago due to time restrictions) doesn't cover the territories of Spain, so I'm unable to calculate the Koppen types. (I calculate the types from climate data, I don't fill in the types myself). If I could add those areas, I would, but I'm afraid I can't. I make efforts to include territories and dependencies where they exist, so it wasn't a deliberate oversight. You'll notice that my Koppen map for Spain was removed from every Wikipedia page it was on, due to very strong feelings from Spanish users about perceived issues with it. (See the lengthy discussion page for the Valencia wiki page). I currently see no climate maps on the w:Climate of Spain page, so it appears none have met the criteria of an acceptable Koppen map by the community there. I do not plan to make future climate maps of Spain in the future due to the intense debate surrounding the country's climate. Redtitan (talk) 00:10, 12 September 2017 (UTC)[reply]
@2602:30A:C0FF:A6E0:4D65:697:A4B4:5E4D: I see there's been an edit about the Catalonian referendum to the original question since my reply. Not sure how that is relevant, but I do not plan to make a map of Catalonia (regardless of its current or potential future political status) either. Redtitan (talk) 20:21, 27 September 2017 (UTC)[reply]

kml file[edit]

Could you post a kml file for the US? I would like the lower 48 states. — Preceding unsigned comment added by Kgbmac (talk • contribs) 16:59, 5 December 2017 (UTC)[reply]

File:Alaska Köppen.svg[edit]

File:Alaska Köppen.svg has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues.

Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

2601:203:4000:72E7:2183:917B:F376:7088 03:29, 28 March 2018 (UTC) [reply]

png to svg conversion?[edit]

So I'm currently working on my own set of climate maps similar to yours. I'm using the same isotherms and data sources that you are. However I'm adding in a couple of things:

  • Internal subdivisions (such as states and counties for the United States) in order to allow for people to more easily see the spread of climate zones within a country
  • Climate zones of surrounding countries/states/other polities in faded out tones (in order to show the continuity of climate zones)
  • Creating a consistent scale for all maps of one square pixel to the kilometer (so people can more easily cobble them together if they need)

Anyway, I'd love to upload them to Wikimedia, but I know they prefer svg files. I only have the capability to make png files and other conventional image files. Would you be able/willing to convert them to svg for use on Wikipedia? —Preceding unsigned comment was added by 2601:18C:402:DEE0:5556:6C40:204A:C788 (talk) 02:31, 9 April 2018 (UTC)[reply]

@2601:18C:402:DEE0:5556:6C40:204A:C788: I'd recommend downloading Inkscape. It can be loaded on multiple operating systems and should allow you to convert between PNG and SVG. Best of luck with your mapmaking. Friendly note - I actually have done Koppen climate maps for all US states, some US territories, major US regions, Canadian provinces and territories, Australian states and territories, and constituent countries of the UK, and a few administrative regions of Chile, so if you're hoping to cover an uncovered area by going after internal subdivisions, I've got those particular ones covered. However, if you're hoping to make your own versions of those, you're more than welcome to make your own. (Also, all the maps outside of the US that I've made do use a consistent scale of 1 km = 1 pixel; those in the US have a finer scale though, drawing on more accurate PRISM data which I think goes to a scale of 800 m per pixel). Happy mapmaking! Redtitan (talk) 05:20, 9 April 2018 (UTC)[reply]
@Redtitan: This is sort of what I meant if that helps at all: —Preceding unsigned comment was added by 2601:18C:402:DEE0:29E2:FA61:2E20:6934 (talk) 06:31, 12 April 2018 (UTC)[reply]

Long time since we have talked[edit]

Hey dude, it's been a long time since we have talked. Can you make a higher res version of the British Columbia map? Also, please don't feel as if I'm trying to boss you around and make you do things, because I'm not. I just have an eagerness in the maps as well. Also, please email me, it's Thanks for reading. Alex of Canada (talk) 01:02, 22 July 2018 (UTC)[reply]

Maps of Brazil and its states[edit]

Hello, in many articles I have seen your wonderful maps with the climatic classification of Köppen, the quality of them is very good! I appreciate it! I know that you have stopped making maps, but I would very much like you to make a map of Brazil and its states. I did some maps but the quality of your maps is much better. Thank you very much and congratulations! Allice Hunter (talk) 00:43, 16 November 2018 (UTC)[reply]

@Allice Hunter: Thanks Alice! I've actually started making maps again recently. I'll definitely consider Brazil for my next country. I've automated my mapmaking using Python code, but that code doesn't work as well on countries much larger than Ethiopia. I just managed to run the code on India, so I think the code is getting close. Redtitan (talk) 17:12, 22 November 2018 (UTC)[reply]
So I guess it would be easier for you to just do maps of the states. I already made several climatic maps for Brazilian states, but they all used as base File:Climate of Brazil.tif, you can see more in my contributions. But I'm sure your maps will be much more accurate. Allice Hunter (talk) 17:38, 22 November 2018 (UTC)[reply]
@Allice Hunter: I just finished my code and I'm happy to say I have successfully calculated the climate types for Brazil. I'm going to aim to get it in a map and uploaded sometime this week. Clipping out the Brazil state portions of the climate types and putting them in maps might take a bit longer, but I plan on doing those too. If you'd be interested, I'd be happy to make versions of the map with Portuguese text. I've worked with a few other Wikipedians to make French and Irish language versions of maps and would love to have the Brazil maps in Portuguese. All I'd need are translations for the standard text I have in my maps (you can see that text in the Ethiopia map here: Redtitan (talk) 17:14, 27 November 2018 (UTC)[reply]
Yes, I can translate the names of the climates for you, I'll create a translation table for you, when I finish I'll put it here. I'd like if possible, you send the maps of the states of Brazil as a new version of my existing ones (to avoid duplication), you can change my author's name to yours if you want. Allice Hunter (talk) 19:06, 27 November 2018 (UTC)[reply]
@Redtitan: . I just finished the translations table, you may access whenever you want: translations list. Allice Hunter (talk) 20:06, 27 November 2018 (UTC)[reply]
@Allice Hunter: Thanks so much! I'll try to get a map of Brazil up by this weekend. Redtitan (talk) 06:25, 5 December 2018 (UTC)[reply]
Ok, I'm anxious to see how it will be. Allice Hunter (talk) 20:43, 8 December 2018 (UTC)[reply]
@Allice Hunter: English version done - just about to upload. I'll upload the English version separately, then upload the Portuguese version as a new version of yours to avoid duplication. Redtitan (talk) 03:48, 10 December 2018 (UTC)[reply]
@Redtitan: The map is absolutely perfect!!!!!!! I have maps in English and Portuguese of some Brazilian states, they need to be updated. Allice Hunter (talk) 04:34, 10 December 2018 (UTC)[reply]
For you to find them more easily: in this page (Maps) you can find all climate maps I made in Portuguese. In Category: Köppen climate classification maps of states of Brazil and Category:Köppen climate classification maps of regions of Brazil are all maps in English. Thanks for everything! Allice Hunter (talk) 05:05, 10 December 2018 (UTC)[reply]

Climate map of South Africa[edit]

Hi and thanks for creating the climate map of South Africa. I have noticed a small problem with it though. It appears to miss out a small part of South African territory near the Indian Ocean coast immediately south of the South Africa-Mozambique border. If you look at a map, the coast is aligned NNE-SSW in this area, but in your climate map the edge of the shaded area is aligned NNW-SSE, indicating a missing wedge-shaped area of land. I'm interested in the area because I suspect it is the only area of South Africa with an Aw (or any A-type) climate, based on places such as St Lucia to the immediate South being marginally below 18 C in the coolest months. Booshank (talk) 15:50, 27 November 2018 (UTC)[reply]

@Booshank: Afraid I'm still a little confused - I see the area you're talking about, but I think it might be the map projection that makes it appear to slant in a different direction. I've got a new script which automates the climate classification process and will run Mozambique soon. I can zoom in around the border area you're talking about, perhaps in a better projection (this is an older map of mine), and then you can see that area up close. Redtitan (talk) 18:15, 27 November 2018 (UTC)[reply]
I don't think it's a map projection issue because other maps don't show any marked change in alignment of the coast north of St Lucia, but your map has quite a sharp break where the alignment turns to the north west. Also, the South Africa - Mozambique border (the shorter East-West one, not the longer North-South one) is roughly as long as Swaziland is wide, but in your map it is only about a quarter of the width of Swaziland. Basically I think that the map is missing a roughly triangular piece of South Africa bounded by the Mozambican border, the Indian Ocean and a line running from about Sodwana Bay to about half way along the SA-Mozambique border. Perhaps it's missed out because it has an Aw climate that didn't show up? Booshank (talk) 19:15, 27 November 2018 (UTC)[reply]
@Booshank: Ah, I see the area you're talking about now. And you're exactly right - the 'A' tropical climate got left out. I just went back to my old map file and the I didn't break down the A layer into subtypes, so it got left out. Thanks for the catch there! My older maps involved manual processing, where I combined each type step by step, and it usually took hours. It was also a bit more open to human error as a result. It should be an easy fix though - I can run my new code which automates all the classification work and have a corrected map up soon. But you're right - that is the only area of A climate in South Africa. Redtitan (talk) 19:37, 27 November 2018 (UTC)[reply]
@Booshank: On an interesting side note, looks like there's some minor area of 'A' climate on the Mozambique-SA border just north of Swaziland as well. Although my old map went off the 1960-1990 climate normals from, and I'm now using 1970-2000 climate normals, so that might change in the corrected version I run. Redtitan (talk) 19:56, 27 November 2018 (UTC)[reply]
Very interesting! I was intrigued by the coastal area even though it's only small and doesn't contain any important settlements because I hadn't seen any evidence of an 'A' climate existing in South Africa, but thought it might there. I hadn't even considered the possibility of it existing in the other border area.Booshank (talk) 20:07, 27 November 2018 (UTC)[reply]

How to get the 2nd letter of C and D climates?[edit]

Hi! I want to know, where do you get information such as the precipitation of the driest month in winter and the precipitation of the wettest month in winter? I'm using the bioclim raster on ArcGis. So I think I need this kinda info to get the 2nd letter to calculate C and D climates. Thx in advance --Gabrielsanz (talk) 15:59, 22 January 2019 (UTC)[reply]

Source of derivative work is not properly indicated: File:Resistance to US Withdrawal from Paris Agreement.svg[edit]

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Yann (talk) 09:10, 6 February 2019 (UTC) [reply]

KML/GIS shapefile availability?[edit]

You are clearly working with high resolution datasets and your maps have the highest resolution I've seen available for Köppen climates. I see a few other comments about posting KML. Would you be willing to post KML files or make your GIS shapefiles available? I'm most interested in California. —Preceding unsigned comment was added by (talk) 03:58, 18 February 2019 (UTC)[reply]

Same here, but Canada (and BC in particular). Alex of Canada (talk) 18:32, 27 March 2019 (UTC)[reply]

Warp map to new projection[edit]

I noticed that you created a köppen climate map of the world in January of last year as an svg file around the same time that Noemi Vergopolan posted a similar world köppen map.

Map world Köppen climate map by Redtitan (Adam Peterson). Isotherm used is -3°C
Map world Köppen climate map by Noemi Vergopolan et al.. Isotherm used is 0°C.

Since both files are svg vector image files, they should be easily transformed into a new map projection without altering the original image severely. I wanted to know if you were aware of a plugin for Inkscape that allows the user to take a given world map projection and transform it into a new map projection. I remember using a similar tool for transforming raster map files to different projections that used java several years ago, but I don't know if the program is still available. I would like to modify sections of both your world map and Noemi Vergopolan's world map into orthographic or polar projections for use in Wikipedia articles on climate in order to correct for distortion at high latitudes. — Preceding unsigned comment added by Rigognos Molinarios (talk • contribs) 23:13, 1 January 2020 (UTC) [reply]

If you're still interested in reprojecting my map, I'm happy to do that on my end in the GIS software and re-export out this map. What projection did you have in mind? It looks like I used Robinson here (can't recall exactly why I chose that one since it's been a while since I made that map). Redtitan (talk) 09:04, 24 December 2021 (UTC)[reply]

Koppen Climate Map for Colombia with departments[edit]

Thank you for your great contributions in making these maps. Can you please make this map Colombia Köppen.svg with department boundaries on it? It will be a useful contribution. See this map of Argentina pls Koppen-Geiger Map ARG present.svg Shaheen Hassan (talk) 18:28, 19 May 2021 (UTC)[reply]

Köppen Climate Classification for Antarctica and Greenland[edit]

Dear Redtitan,

I am incredibly impressed that you are able to provide accurate and "pixel-rough" Köppen climate maps of numerous countries and subdivisions; I bet that the pixel-rough detail is probably a combination of using the known data in landmark locations, plus the interpolative data you probably devised. However, I am looking forward for the Köppen climate maps for Greenland and Antarctica, which are the two primarily EF places on Earth? I wonder, which parts of Antarctica aren't EF?

I am curious, which techniques did you use to provide such finely detailed Köppen maps, and is it really a product of ingenious interpolation based on geographical factors?

Best of luck,

--MULLIGANACEOUS-- (talk) 21:26, 31 May 2021 (UTC)[reply]

Thank you for the compliment about the maps. I make my maps based off raster climate data, so there is interpolation involved, but not anything I'm involved generating. All I really do is use GIS software to classifying climate data into types, using climate data generated by climatologists.
My main source of climate data for areas outside of the US has been from That dataset does include climate data for both Greenland and Antarctica, but the accuracy of that data is going to depend on how well there is station coverage in those areas. My sense is that those areas might be more broadly interpolated from a more limited data source. Redtitan (talk) 08:53, 24 December 2021 (UTC)[reply]


I love your Köppen climate classification charts — Preceding unsigned comment added by ザアンノウンエディター (talk • contribs) 14:12, 8 June 2021 (UTC)[reply]

Thanks! Redtitan (talk) 08:53, 24 December 2021 (UTC)[reply]