Peirce Quincuncial Projection

Thursday, March 1. 2007

Peirce Quincuncial Projection

Invented at the end of the 1800's, this is the Peirce Quincuncial Projection (commonly, and wrongly, spelled as Pierce) of this panorama.

This is a projection with very few uses in Geography, but with fascinating properties. It is conformal except for 4 points, which means that you can recognize anything no matter where it is placed, albeit with some distortion in size. It can be tessellated (more on that later). Its nadir is in the center and the zenith is split in the 4 corners.

Michael Gross helped me with the math and the basic code to implement it. It is also part of Flexify 2.

Posted by dmg in 20d, Colour, Panorama, Peleng 8mm, Victoria, Working spaces at 23:14 | Comments (0) | Trackbacks (0)

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