Hi ,
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).
I yet have no experience with it, but maybe this paper gives the
necessary insight:
http://www.nceas.ucsb.edu/files/scicomp/GISSeminar/GrassImageProcTools.pdf
Regards,
Markus
Mats Elfström wrote:
Hi all!
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?
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?
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.
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.
I would suggest you follow the advice to obtain a ready made surface
to drape your image on.
Regards, Mats.E
2010/4/27 Ulf Almroth <[email protected]
<mailto:[email protected]>>
Johan,
What you need is a photogrammetric package. I only know one open
source package. Look at http://www.efoto.eng.uerj.br/en:start 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.
Ulf Almroth
----- Original Message ----- From: "Johan Nilsson"
<[email protected] <mailto:[email protected]>>
To: <[email protected] <mailto:[email protected]>>
Sent: Monday, April 26, 2010 3:01 PM
Subject: [Qgis-user] IR-airphoto and 3D
I have very little knowlight of terminology in this area.
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?.
If not QGIS have this, is there any other open
source-applications to
use, for instance GRASS that manage this, and what is the name
of the
process to make a 3D-map from at leaste 2 airphoto in
GIS-terminology?
/Cheers
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--
______________________________________________
Mats Elfström, Väpplingvägen 21, SE-227 38 LUND, Sweden
tel: +46 46 145959 / mob: +46 70 595 39 35
alt e-mail: [email protected] <mailto:[email protected]>
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