[GRASS-user] Stereoscopic images

[Amagine]

I have not had enough time to seriously spend finding an OpenSource  
alternative.
UNBC GIS Lab (University of British Columbia) http:// 
www.gis.unbc.ca/  They are doing some fantastic work there.

uhmm I believe Stacy Porter did some work which is similar in nature  
to what you are wondering Morten.

http://www.gis.unbc.ca/courses/geog499/projects/2005/proters1/index.html

yes, and it appears she used PCI Geomatics orthoengine for extraction.

Here are a couple links to investigate further:

http://www.pcigeomatics.com/cgi-bin/pcihlp/OESE
http://www.pcigeomatics.com/cgi-bin/pcihlp/PACE

Now, there is a very old opensource solution that can also do the  
parallax maths I believe, although I have not been able to test it,  
and I do not know anyone who has.
I am sure the theory is solid though.

You can also check out http://mpa.itc.it/markus/spectral_unmixing/  
about spectral angle mapping.

Thanks to Markus Neteler and company from Trento Italy,
not too sure how that project developed but seeing as he replied  
here ...

Anyways there is a good paper in the above link covering image  
registry using i.ortho.photo (?) in GRASS.

And you may also want to check out OpenDX, they may have some tricks  
over there as well.
http://www.opendx.org
There is some really good info on methodology of photogrametry  
analysis there anyways: ie. http://activetectonics.asu.edu/LabDocs/ 
Orthomax.html

As for hardware, there are specialized systems that will Externally  
display a pseudo-3D of stereo pairs,
but I do not believe they actually physically process stereo pairs  
into useable elevation maps for GIS data.
Perhaps I am wrong, but I am sure these systems are crippling in cost  
anyways and a fully licensed software solution would be much cheeper.

This is pretty much all the informations I have attained a few months  
ago in investigating the same end.

So hopefully there is something in here that will guide you to your  
final destination point.

Good luck, and I would really love to hear how things develop at your  
end.

cheers!

Mars

On 30-Jun-07, at 7:20 PM, Glynn Clements wrote:

>
> Markus Neteler 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?
>>
>> As far as I know, there is some stereo support in openGL
>
> I don't think that helps here. AFAICT, Morten is interested in
> converting a stereo pair of 2D images to 3D, while OpenGL's stereo
> support amounts to support for rendering to a stereo pair (you still
> have to render each view separately).
>
> -- 
> Glynn Clements <glynn at gclements.plus.com>

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