[GRASSLIST:5950] Re: oblique photography

[Maciek Sieczka]

From: "Trevor Wiens" <twiens at interbaun.com>

> Markus Neteler <neteler at itc.it> wrote:
>
>> On Sat, Feb 19, 2005 at 12:52:15AM -0700, Trevor Wiens wrote:
>> > Does anyone have any experience using oblique images from known
>> > locations (2 or more cameras at different locations) to extract 2 and 3
>> > d information?
>> >
>> > The intended application would be to track fire growth and expansion
>> > over time.
>> >
>>
>> Nothing helpful, but we have at least extended the i.ortho.photo
>> procedure to
>> geocode oblique imagery:
>>
>> - M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C.
>> Furlanello. New image
>>   processing tools for GRASS. In Proc. Free/Libre and Open Source
>> Software for Geoinformatics:
>>   GIS-GRASS Users Conference 2004, Sept. 12-14, Bangkok, Thailand, 2004.
>>   http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37
>>
>> - M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C.
>> Furlanello, 2005,
>>   An integrated toolbox for image registration, fusion and
>> classification.
>>   International Journal of Geoinformatics, Special Issue
>>   on FOSS/GRASS 2004 & GIS-IDEAS 2004 (in press)
>>
>> On top of the geocoded imagery one could think of developing something
>> maytbe with r.series etc.

> Thanks. This would be helpful for 2-d data, but for objects like smoke
> plumes, I'm not sure how this could work. Since posting the question on
> the list, I've run across the Stereo application that appears to have sat
> dormant for some years.
> A collegue and I are going to redo the interface
> in PyQt and keep most of the underlying C code for camera calibration,
> coordinate tranformation, etc.

So will it be possible to extract the elevation from a stereo pair of 
vertical aerial photos using your Stereo-based application?

> The planned output will be tab delimited ascii files.

And I could import it into Grass and interpolate into a raster DEM, correct?

> The long term plan is to incorporate Deluany Triangulation
> code to export 3-d objects rather than just point clouds.

Which e.g. could be an shp file and imported into Grass for visualization in 
NVIZ as a 3d polygon vector layer etc.?

If I'm any wrong here please correct me. But If I'm not - yippie! what a 
perspective! Thank you for this inintiative a tone!

> Once this work
> is running we will set up a small website for the project in the event
> that others want to use or develop it further.

Please keep the grasslist informed.

Maciek