Re: [PanoToolsNG] Re: Peirce Quincuncial Projection
- jeffrey wrote:
> Oh my god. I think I ate too many of those little mushrooms.No, those are the bad ones. Send them to me and I'll "get rid" of them
for you. =8^)
> -- 3a. Peirce Quincuncial ProjectionPat Swovelin
> Posted by: "mdgrosse" adv@... mdgrosse
> Date: Sun Jan 7, 2007 9:40 am ((PST))
> After I saw the different projections in the "An album of map
> projections" (http://pubs.er.usgs.gov/usgspubs/pp/pp1453), I decided
> to implement the Peirce Quincuncial projection. The special thing
> about this projection is, that it is possible to tessellate the images.
> Unfortunately it turned out to be more difficult then I expected.
> Especially the calculation of the inverse made a lot of problems. But
> after a lot of trial and error I got working (although very slow) version.
> Here is an example:
> The projection:
> The tessellation:
> And this is the clou (sorry - 6MB):
> If someone is interested in the code:
> To compile the code routines from "Numerical Recipes in C"
> (http://www.nr.com) are needed.
> Michael Gross
Cool Guy @ Large