On 14/03/2015 05:35, Even Rouault wrote:
Selon Gergely Czuczy <[email protected]>:
Hello,
I would like to ask whether there's any support for reading 3D TIN data
from WKBs, and if so, how can I do this?
Currently when I try to read the following's WKB:
TIN Z (((512 -512 0,512 512 0,-512 -512 0,512 -512 0)),((512 512 0,512
-512 0,-512 -512 0,512 512 0)))
I get the error message:
ERROR 6: Unsupported WKB type 1016
ERROR 3: OGR Error: Unsupported geometry type
I would like to read TINZ data from PostGIS into C++ and Python
programs, however there doesn't seem to be many libraries that support this.
So, how can I read such 3D TINs using GDAL?
Gergely,
There's no support in GDAL for TIN. If you would want to implement it, you could
take inspiration of what has been done recently to support curve geometries.
Reading http://trac.osgeo.org/gdal/wiki/rfc49_curve_geometries should direct you
at the places to modify.
If you want to take a shorter route, you could just parse the WKB/WKT returned
by PostGIS at your application side.
Even
Thank you for your reply. To be honest I would like to focus on my pet
project, and probably you could find better people with 3D/graphics
coding experience than me. That's one of the reasons why I am looking
for some library to do the heavy lifting instead of me.
Could you please give me some pointers on how to parse a WKB/WKT?
Especially the float representation in the WKB I'm interested in. I
think I will try to parse it myself.
After that, if I parse it manually, can I construct a gdal object out of
it for manipulation, and at the end export it again to one or more TINZs
for propagating it back into postgis?
Gergely
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