Morten,
I have experience with softcopy photogrammetry workstations and have
done some searching for open source software related to
photogrammetry with out much luck.
As several people have already mentioned, there is E-FOTO which is an
open souce project and appears to support hardware stereo as well as
anaglyph viewing. Unfortunately, I can't read Portuguese so I don't
know much about it.
OSSIM is capable of reading an exterior orientation and camera
calibration files to generate Orthophotomosaics, but it doesn't have
a auto-correlation routine for the automated extraction of DSM's nor
is it capable of viewing image pairs for stereo viewing.
There is a free , but not open source, program called hypercube. It
does allow for viewing stereo models in anaglyph mode and has a auto-
correlation routine for the automatic extraction of DSM's, but it
requires a RPC model rather than the exterior orientations and camera
calibration file that are normally used with aerial photo's. It
doesn't allow for the generation of RPC files which kind of leaves
you SOL unless you have another means of generating these types of
files. I am unfamiliar with the Rational Polynomial Coefficient
method of sensor modeling so I don't know if it is possible to
georeference an image in this fashion with open source software.
http://www.tec.army.mil/Hypercube/
There are no open source or free software programs that I have been
able to find and work that allow one to perform aerotriangulation.
The USGS still distributes the source code for a package called AT
SYS321. It a a bunch of old programs written in fortran that were
originally written for Aviion Unix based platform (I've never even
heard of that one). I tried to get them to compile once and quickly
abandoned the effort without much success. Doesn't look like and
development has been done on them in a very long time so resurrecting
such a program is probably more work that it is worth.
http://mcmcweb.er.usgs.gov/atsys/atsys.html
As far as commercial solutions go.... there are several. But you may
want to slip some Nitro under your tongue before you ask how much
cause a sophisticated high end softcopy workstation will cost you
your first born child. The least expensive system I know is LISA-foto
mated with BLUH aerotriangulation package. a licence is 10000 euro's
but you can get one for half that if it's for academic purposes.
http://www.ipi.uni-hannover.de/lisa/
If I recall correctly PCI geomatica with the OrthoEngine Airphoto
models, OrthoEngine productivity tools, Automatic DEM extraction and
OrthoEngine Stereo support will run around 20000US (errrr.... I think).
To move into a full function high end system like the software
produced by inpho GmbH, BAE Socet Set or Z/I imaging, (Take nitro
now) your looking at around 50k plus hardware for one seat. We use
products from inpho GmbH and can vouch for their quality.... as well
as their cost.
http://www.inpho.de/
http://www.intergraph.com/photogrammetry/
http://www.socetgxp.com/
To view in Stereo you do need special hardware. AFAIK they all
require CRT monitors and such monitors generally need to have a
refresh rate of at least 120Hz at the desired resolution. The
graphics cards need to be quad buffered which means that you're
looking at the pro series cards such as ATI Fire GL cards, Wildcat
and NVIDIA Quadro series. Finally you need LCD shutter glasses (~
$1000) or polarizing panels (~$2000).
http://www.reald-corporate.com/scientific/
However, different systems may have a limited number of supported
cards so it's best to chose your software and then go with whatever
platform they recommend.
Hope this helps more than it discourages.
Cheers,
Mike
On 29-Jun-07, at 4:56 AM, Morten Sickel wrote:
I am involved in a project using aerial photographs, earlier we have
been using dias and an 'old fashioned' stereoscope for
interpretations.
Now we are to get the pictures as files. What kind of hard- and
software
do we need to view stereoscopic images on screen? Is this possible
within grass / ossim or otherwhere in the free software family? Do we
need to get some special hardware, or is is possible to calculate the
heightinformation from a couple of georeferenced images and then
use eg
nviz? Does anyone here have any experience on that kind of work?
Morten
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