Talk:Gall-Peters projection
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An example of this one would be great. I'm familiar with the Mercator projection, but can't imagine what this one would look like. --KQ 18:09 Aug 8, 2002 (PDT)
- Here are some samples of various projections (copyrighted page, so we can't steal them): http://www.geog.ouc.bc.ca/physgeog/contents/2a.html --Brion VIBBER
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- Here one can find PDF versions of MANY projections: http://www.ilstu.edu/microcam/map_projections/index.html and it says at the bottom "Graphics as of 12/24/2004, created and released into the Public Domain by Paul B. Anderson pbander@yahoo.com (A member of the International Cartographic Association's Commission on Map Projections)" --
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- Oh... those. I've seen those. I don't think they'd be too hard to "reverse engineer", actually--just take a PD Mercator projection and use the GIMP or Photoshop to squash it at the top and bottom. I'd try it now except I have to pack for a trip. Anyway, thanks. --KQ 18:19 Aug 8, 2002 (PDT)
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- I think (and I might be wrong) that what you've suggest would not work. The Peters map is not just a stretched or squashed version of Mercator. In fact, I think you'll find it's stretched N-S at the equator (but squashed E-W there, relative;y speaking) but at the poles it's the other way around. Anyway, I don't think simple manipulation of a Mercator in GIMP will give you a real Peters, though maybe you could created something that looked a bit like one.
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Where can I get data showing the outlines of the continents? With that I could code up the map projections (I have code for some stashed away somewhere, and Gall-Peters is pretty easy) and draw them. -phma
FTA: Within geography more generally, some commentators see the cartographic controversy over the Peters world map as a sign of immaturity in the cartographic profession regarding the fact that all maps are political.
Perhaps I've been drinking the koolaid for too long, but there are technical reasons for some map projects. Or perhaps it is just a coincidence that routes on a Mercator projection are a straight line!
Some commentators may think that all maps are political. I don't doubt that some commentators think that all maps are a conspiracy against flat earthers. :D
I'm unhappy with the wording of the quoted sentence. Perhaps we need a pro/cons section of the article?
--Dasunt 23:26, 5 February 2006 (UTC)
It's impossible to eliminate an "agenda" from a map, since the map has a purpose. All maps distort. You must choose what to put on and what to leave off a map. The agenda, and the decisions that go into fulfilling it, are argued to be "political". While that may be true (depending on definitions), it would be an unfounded leap to claim that the political aspects of most map carry significance for their audience. Therefore I think rather dimly of the unjustified politicization promoted by some commentators, but I don't question the fact that all maps are (at least faintly) political.
Strebe 05:51, 10 April 2006 (UTC)
Contents |
[edit] NPOV
The section entitled "the controversy" needs some serious NPOV work and should have citations. WP doesn't say things like "All of those claims were erroneous", even if such is true, without attributing the statement. -- Jonel | Speak 13:12, 8 April 2006 (UTC)
I can't find any citation to justify the claim that Peters finally acknowledged the prior art of Gall. I wonder if he really did.
Strebe 05:40, 10 April 2006 (UTC)
the 'controversy' section says, in part, "Faced with his notoriety, by 1980 many cartographers had turned overtly hostile to the problematic claims many viewed to be truculent, exaggerated, or outright erroneous." wow. there's a serious pov issue here, not to mention a prose so purple it borders on ultraviolet. anyone want to take on a rewrite? frymaster 20:16, 4 May 2006 (UTC)
Frymaster, could you describe precisely what you think is wrong with the point of view, rather than just accusing the prose of having a "serious pov issue"? The passage reports that some cartographers viewed the claims a particular way. That's completely neutral. As for your complaint about the prose color, is it the use of capital letters that blinds you, or was it just the hardly-exotic-words you don't happen to know?
Strebe 23:28, 6 May 2006 (UTC)
[edit] Citation needed ?
The paragraph about the names given to the Gall-Peters projection is crisp clear and absolutely neutral. In its last period it is said that, in recent years, the designation Gall-Peters “seems to prevail” . Why is a citation needed to justify this statement? Is there any published study revealing a systematic counting of all written and spoken occurrences? If not, better to accept the fact that, in specialized literature, the name Gall-Peters is indeed prevailing. Of course, I took off the “citation needed” tag. Alvesgaspar 08:31, 12 May 2006 (UTC)
[edit] Individual points needed
It would be nice to have a list of the individual points the map aims to address. That is, the fact that the equator is placed in the middle, the Greenland v.s. Africa problem, North v.s. South , europe v.s. Africa and so on. Those are found on the web site and on the actual printed maps as well.
[edit] Explicit formula?
Could someone please add the function that relates a point of the Earth's surface to the point on the map under hits projection? Tompw 16:43, 20 June 2006 (UTC)
Here it is: x = cos(45)*long; y = sin(lat)/cos(45) (lat = latitude, long = longitude) Alvesgaspar 21:45, 20 June 2006 (UTC)
[edit] New image
I've replaced the old line drawing with a projection of a satellite view of the Earth. The black bars on each side may be "disturbing", but it needs to be noted that this is part of a larger series of images of projections I have prepared with a common image size to ease comparisons. For example, view this article in one window and you can "blink" compare with Winkel Tripel or Goode homolosine projection and so forth in another window. Of course, if this is insufficient rationale, feel free to revert and I'll leave this article all by itself. mdf 14:40, 14 September 2006 (UTC)
