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Re: [PanoToolsNG] Re: Peirce Quincuncial Projection

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  • Pat Swovelin
    ... No, those are the bad ones. Send them to me and I ll get rid of them for you. =8^) ... Pat Swovelin Cool Guy @ Large
    Message 1 of 9 , Jan 8, 2007
      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 Projection
      > Posted by: "mdgrosse" adv@... mdgrosse
      > Date: Sun Jan 7, 2007 9:40 am ((PST))
      >
      > Hi
      > 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:
      > http://mdgrosse.net/gallery2/main.php/f/pq
      > The tessellation:
      > http://mdgrosse.net/gallery2/main.php/f/pqt
      > And this is the clou (sorry - 6MB):
      > http://mdgrosse.net/gallery2/main.php/f/pqm
      >
      >
      >
      > If someone is interested in the code:
      > http://mdgrosse.net/pano/peircequincuncial.c
      >
      > To compile the code routines from "Numerical Recipes in C"
      > (http://www.nr.com) are needed.
      >
      >
      > Michael Gross




      Pat Swovelin
      Cool Guy @ Large
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