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Hi ,<br>
<br>
there are also some GRASS modules like i.ortho.photo, which might be an
option (note: yet they are neither included in the native windows
version of GRASS nor in QGIS for Win).<br>
I yet have no experience with it, but maybe this paper gives the
necessary insight:
<a class="moz-txt-link-freetext" href="http://www.nceas.ucsb.edu/files/scicomp/GISSeminar/GrassImageProcTools.pdf">http://www.nceas.ucsb.edu/files/scicomp/GISSeminar/GrassImageProcTools.pdf</a><br>
<br>
Regards,<br>
Markus<br>
<br>
<br>
Mats Elfström wrote:
<blockquote
cite="midv2u1dc6d33c1004271322zde35194cq536358d85d1203d5@mail.gmail.com"
type="cite">Hi all!<br>
<br>
I agree, this software effort seems interesting enough to take a closer
look at. However, I notice that the material on the website is not
updated since 2008. I wonder why?<br>
Anyway, as an experienced photogrammetrist, I know that you need more
than two random shots with sparse geometric info to create an oriented
stereomodel. You mention corner coordinates. Do you have the ground
elevation for these as well? Do you know the lens data? Ground control
points?<br>
OK I know that you can compute a semblance of a 3D model from a number
of random shots, but that will only be valid in it's own context
without ground control. <br>
See if you can drape the images on the Google Earth surface? That may
give you an idea of the topography if your area is not too small.<br>
I would suggest you follow the advice to obtain a ready made surface to
drape your image on.<br>
<br>
Regards, Mats.E<br>
<br>
<div class="gmail_quote">2010/4/27 Ulf Almroth <span dir="ltr"><<a
href="mailto:ulf.almroth@lillabjoern.se">ulf.almroth@lillabjoern.se</a>></span><br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Johan,<br>
What you need is a photogrammetric package. I only know one open source
package. Look at <a href="http://www.efoto.eng.uerj.br/en:start"
target="_blank">http://www.efoto.eng.uerj.br/en:start</a> and download
the latest version. It has all you need to accomplish your task,
includning a modul for DEM (digital elevation model) extraction from
the stereo pair. Yoy dont need dual screens, fancy cards and polaroid
glasses. A split screen or re/blue glasses like som childrens books had
when I was a kid will do. Note: I found this package recentlly and had
no time to test it, but I am going to. There used to be another free
package, photomodeler, but i don't think it is free anymore and anyway
it is phocused on terrestrial and not on aerial images.<br>
<br>
Ulf Almroth<br>
<br>
<br>
----- Original Message ----- From: "Johan Nilsson" <<a
href="mailto:joni8135@gmail.com" target="_blank">joni8135@gmail.com</a>><br>
To: <<a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a>><br>
Sent: Monday, April 26, 2010 3:01 PM<br>
Subject: [Qgis-user] IR-airphoto and 3D
<div>
<div class="h5"><br>
<br>
<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I have very little knowlight of terminology in this area.<br>
<br>
Is there a possibility if you have 2 semi-overlapping IR-photo, with<br>
known flight-altitude, distance between picture, camera-model and<br>
pictures corners coordinat, to make a 3D model with height-data?<br>
<br>
To use 2 pictures to get "stereo-vision", requere quite special<br>
dual-screens and gfx-card and polaroid-glasses, so to skip this, are<br>
there some other software that can pick altitude for every pixel in<br>
the area there 2 IR-photo cover?.<br>
<br>
If not QGIS have this, is there any other open source-applications to<br>
use, for instance GRASS that manage this, and what is the name of the<br>
process to make a 3D-map from at leaste 2 airphoto in GIS-terminology?<br>
<br>
/Cheers<br>
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<br>
-- <br>
______________________________________________<br>
Mats Elfström, Väpplingvägen 21, SE-227 38 LUND, Sweden<br>
tel: +46 46 145959 / mob: +46 70 595 39 35<br>
alt e-mail: <a href="mailto:mats.elfstrom@telia.com">mats.elfstrom@telia.com</a><br>
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