Editing Talk:2489: Bad Map Projection: The Greenland Special

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New xkcd up: Pre-Pandemic Ketchup [[Special:Contributions/162.158.78.64|162.158.78.64]] 15:08, 16 July 2021 (UTC)
 
New xkcd up: Pre-Pandemic Ketchup [[Special:Contributions/162.158.78.64|162.158.78.64]] 15:08, 16 July 2021 (UTC)
 
:::: Ideally, we should overlay the xkcd map to Tobler (not K5, the poles - or at least the visible bits at the south - are clearly different in the same way K5 is to Tobler) in the same way. I'm sure the other day I saw an assertion it ''was'' K7 (clearly wrong, to my eyes) but not sure it was even here (edited out?) so let me just reinforce my objection to that without any obvious reason in case it gets read by the same people who share my other relevent lurking/participatory habits. [[Special:Contributions/141.101.99.13|141.101.99.13]] 09:00, 19 July 2021 (UTC)
 
:::: Ideally, we should overlay the xkcd map to Tobler (not K5, the poles - or at least the visible bits at the south - are clearly different in the same way K5 is to Tobler) in the same way. I'm sure the other day I saw an assertion it ''was'' K7 (clearly wrong, to my eyes) but not sure it was even here (edited out?) so let me just reinforce my objection to that without any obvious reason in case it gets read by the same people who share my other relevent lurking/participatory habits. [[Special:Contributions/141.101.99.13|141.101.99.13]] 09:00, 19 July 2021 (UTC)
βˆ’
:Before I totally forget, and long after I should probably have completed the job, for reference I created https://imgur.com/a/ZJ5aCSa (easier to put there than upload here, when I did it). It shows the close match between the Tobler map (ripped from Wiki, and rescaled to the line drawing without being reproportioned) except for probable drawing differences. The 'real' Iceland is actually under the Mercator Greenland (again, ripped from Wiki, needed slight rotation as well as rescaling) forcing the drawn one to be moved. Svalbard could not be matched despite other near-latitude features working well and there's some other minor coastal disagreements (greater or lesser area under the illustrated version). This is perhaps not the bestest-of-best-fits, to the pixel, but it is close. (I did not upload the x2 version of the image, but rescaled back down first. Intended to perfect things before any unveiling, with the ultimate possibility of fully animating transitions between the various display options as well, without making a super-huge .gif as a result.)
 
βˆ’
:The Mollweide and various Kavrayskiy versions mismatched (or, if you prefer, are systematically unmatchable) notably more from the xkcd so, yes, it's very much a Tobleresque original, or some projection I didn't get my hands on to compare. And the remaining 'errors' are from the redrawing process itself.
 
βˆ’
:Finally, I splined in some revised continuations of the Tobler latitude/longitude marks to try to be consistent with their actual passage over/round the Mercatorial Greenland bit. Which was tricky (east-westings winding up and through the gap between G and UK in particular) and might not be how others might have done it, but was a lot easier than trying to overlay the relevent Tissot markings. - So that's how it is, for anyone who is still following this. Enjoy? [[Special:Contributions/162.158.155.157|162.158.155.157]] 20:55, 24 July 2021 (UTC)
 

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