Thank you for your help. Do you know any software that would be able to
create/handle theses projections in a geographical context?
Thanks again,
Simon
Spencer Simpson a écrit :
"Tetrahedral projection" can mean one of two different things:
1. A computer graphics technique for rendering solid 3D objects on a 2d
screen. The solid objects are broken into individual tetrahedrons and each
tetrahedron is projected onto the screen.
2. A multisuperficial map projection. You can nest the Earth inside a
polyhedron, project the Earth's surface onto the polyhedron and then unroll
it. In practice, you strategically position several gnomonic projections
and trim them to fit together as the faces of the polyhedron. The most
famous of these is Buckminster Fuller's Dymaxion Map, which uses an
icosahedron, but it will work with a tetrahedron.
For the latter, which is what I suspect you actually mean, I found the
following:
http://www.progonos.com/furuti/MapProj/Normal/ProjInt/ProjStar/projStar.html
HTH
Spencer
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Simon Roy
Sent: Wednesday, June 21, 2006 4:16 PM
To: Mapinfo-L
Subject: [MI-L] Tetrahedral projection
Hi,
I'm looking for information on tetrahedral projections. I did not
find much on google and directionsmag... Can Anybody can help?
Thank you!
Simon
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Sam Knight a écrit :
Hello Simon,
Bartholomew's Projection comes pretty close, but it is not a true polyhedron.
You've probably already hit this if you've been Googling but, an example is
shown on this page:
http://www.progonos.com/furuti/MapProj/Normal/ProjInt/ProjStar/projStar.html
Have you tried searching "tetrahedric" instead of "tetrahedral"?
Lee Conformal Tetrahedric Projection:
http://www.ilstu.edu/microcam/map_projections/Miscellaneous/Lee_Conformal_Tetrahedric.pdf
Good Luck!
Regards,
Sam Knight
Applications Specialist
Blue Marble Geographics
[EMAIL PROTECTED]
Ph: 800-616-2725 ext. 24
Ph: 207-582-6747 ext. 24
Fax: 207-582-7001
http://www.bluemarblegeo.com
and
http://www.beyondgeo.com
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