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Convert Robinson to Equirectangular

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I have two maps here and want to copy the information (mainly borderlines) of one map into the other map.
As I found out by using Wikipedia, the map i want to extract the information from is a Robinson projection, the map I want the information to copy to is an Equirectangular projection.
The problem is that the only place I can get these informations from is that Robinson map because it's a game map. The land masses are exactly the same as in reality, but the borders and states aren't.

I already tried that by just using Photoshop and just deform the Robinson map, but it's always a bit unaccurate.
So I thought about a more "mathematical" way and used Wikipedia to find out how the maps are projected.

Is there any way to convert simple image maps, even if it may be a bit cumbersome?

Michael Schmeling

Michael Schmeling

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You can use Flexify 2, a Photoshop plugin, to do that. It is able to convert Robinson to equirectangular. You can download a trial version from their website.
Michael Schmeling
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Geocart is made for this sort of work. The problem is more than mathematics. Without proper antialiasing, you’ll lose information.


— daan Strebe
Geocart author

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