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Cylindrical Equal-Area Projection with two parallels

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#1
Johnny

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I have a map in cylindrical equal-area projection with two parallels at 14° 13' N and 14° 13' S.

I have never heard of such a projection with two standard parallels. :o

Does anybody have additional information for this map?
Perhaps you even have an EPSG code for it??

#2
François Goulet

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Projections with two standard parallels aren't uncommon. It only means that it's a secant cylindrical projection. You have a lot of examples on that page:
http://www.progonos....EA/projCEA.html

With two standard parallels, there's less distortions in the northern or southern part of the maps than with only one standard parallel at 0°. You'll see at the page mentioned above.

As for the name of yours, it's hard to say without an image and even then, the cartographer could have choose to change the standard parallels to fit its needs... :(

The one I've seen the most is the Gall's stereographic projection (http://www.progonos....CEA/Img/gas.png), since it's the one I work with every day (it seems to be the projection that fits best a 11x17 page... at least that the one my bosses preferred ;) ) but it's a long shot...




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