[Qgis-user] IR-airphoto and 3D

[Sylvain Maillard]

> Is there a possibility if you have 2 semi-overlapping IR-photo, with
>> known flight-altitude, distance between picture, camera-model and
>> pictures corners coordinat, to make a 3D model with height-data?
>>
>> To use 2 pictures to get "stereo-vision", requere quite special
>> dual-screens and gfx-card and polaroid-glasses, so to skip this, are
>> there some other software that can pick altitude for every pixel in
>> the area  there 2 IR-photo cover?.
>>
>

just to be sure, what kind of result are you hoping? a DEM map with the
altitude for each pixel, or just to watch your area in 3D?

if you just want to wach your area in 3d, you can take a look at
http://grass.osgeo.org/wiki/Stereo_anaglyphs! just consider that your 2
IR-photo are the result of step 1 to 3 ...

so you will have to do:

   1. "ppmtorgb3 left.ppm"
   → Creates from left.ppm the files left.red, left.green, left.blue
   2. "ppmtorgb3 right.ppm"
   → Creates from right.ppm the files right.red, right.green, right.blue
   3. "rgb3toppm left.red right.green right.blue > myfirstanaglyph.ppm"
   4. Put on the red-green glasses and view myfirstanagly.ppm with your
   favourite image viewer.

(ppmtorgb3 is part of the netpbm software http://netpbm.sourceforge.net/)




Sylvain Maillard

Doctorant en Sciences de l'Environnement
Laboratoire Chimie Provence - UMR 6264 / Université de Provence
la Tour du Valat - Centre de recherche pour la conservation des zones
humides méditerranéennes
Le Sambuc
13200 Arles
France
tél:04.90.97.29.79
fax:04.90.97.20.19
www.tourduvalat.org
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