For those unfamiliar with ISO 19107, a cube is a polyhedral surface, 6 face polygons with 4 distinct points each (5 to close with the first = last). Each face shares its 4 edges with 4 other faces (with orientation reversed).
A unit cube at the origin is (using a variant of SF4SQL WKT):
POLYHEDRAL_SURFACE
(
POLYGON(0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0),
POLYGON(1 0 0, 1 0 1, 0 0 1, 0 0 0, 1 0 0),
POLYGON(1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0),
POLYGON(0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0),
POLYGON(0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0),
POLYGON(0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)
)
Regards,
John, editor of ISO 19107
The opinions expressed in this email are purely my own and
do not necessarily represent the opinions of any organization
or otherwise sane person or persons. B^}
John R. Herring
Architect, Spatial Products
Oracle Corporation
One Oracle Drive
Nashua, New Hampshire 03062
ph: 1 603 897 3216
fx: 1 603 897 3334
Annue cœptis - Novus Ordo Seclorum
--- Begin Message --- Title: [Geoapi-devel] Make a cube, win prizes
See :
http://docs.codehaus.org/display/GEOTOOLS/An+ISO+19107+Cube+ContestCan you harness the raw power of the third dimension? If you can figure
out how to make a cube with ISO 19107 geometry objects, please educate me.
Your wisdom shall be placed on the wiki for all to see! Win fame and empty
flattery!Bryce
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