Wikipedia:Reference desk/Archives/Mathematics/2015 March 25

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March 25

Identify map projection in NASA eclipse atlas

Miller cylindrical projection?

Can anyone tell

1. What map projection is used in this image (original at http://eclipse.gsfc.nasa.gov/SEatlas/SEatlas.html ), and
2. What the latitude of the top edge of the map is?

Cheers! cmɢʟee⎆τaʟκ 13:35, 25 March 2015 (UTC)

It looks like a Miller projection, and the mapping from y pixel coordinate to latitude is $\varphi ={\frac {5}{4}}\tan ^{-1}\sinh \,0.002956\,(682-y)$, putting the top and bottom at about ±85°. -- BenRG (talk) 18:31, 25 March 2015 (UTC)