[Geotiff] Image processing project - getting started

[David Burken]

Justin,

If you have access to the actual sensor/camera physics/support data, one 
way to do the initial geo-positioning would be to create a sensor model 
and then orthorectify the image to the terrain.   You could do this with 
the ossim library.

See: http://trac.osgeo.org/ossim/

The tricky part would be making the sensor model if one does not exist 
already.  If you can't do that Kyle's suggestion might be best, perhaps 
using gdalwarp.

Take care,
Dave


On 11/08/2010 02:26 PM, Kyle Shannon wrote:
> Justin,
> I would look at GDAL, gdal.org <http://gdal.org>.  There are a few 
> things that may be of use for you.  There are several command line 
> utilities that may be of use and good a good api for C/C++, python and 
> other languages.  The documentation is good too.  Read through the 
> website and see if it works for you.
>
> kss
>
> # ============================
> Kyle Shannon
> Physical Science Technician
> RMRS Fire Sciences Lab
> Fire, Fuels & Smoke - RWU 4405
> 5775 Highway 10 W.
> Missoula, MT 59808
> (406)829-6954
> kshannon at fs.fed.us <mailto:kshannon at fs.fed.us>
> # ============================
>
>
> On Mon, Nov 8, 2010 at 10:32 AM, Justin Close <justinclose at comcast.net 
> <mailto:justinclose at comcast.net>> wrote:
>
>     Hello all.  I am new to the list and I am looking for some
>     guidance and
>     pointers.
>
>     I am a computer science student working on a project involving
>     manipulation of a large number of images.  The images are aerial shots
>     of the cities at night (taken from space, actually).  We are
>     taking the
>     RAW camera images, saving to TIFF, using the date/time stamp of the
>     image to generally locate what/where the image is of, then manually
>     morphing the image to scale/rotate/position it accurately to reality.
>     Reality in this case is Google Earth; the images will eventually be
>     served up as Google Earth layers.
>
>     The CS part of this is how to automate this process.  We wanted to
>     embed
>     the lat/long information we got back into the image, and GeoTIFF seems
>     to be the perfect format for this.  Low and behold, it can also
>     contain
>     morphing information too, it seems.  And there are all these nifty
>     tools
>     out there that can do this manipulation, apparently.  But for me,
>     who is
>     just starting out with it all, it seems a bit overwhelming; I
>     don't know
>     where to start in order to find out what tools I should be using.
>     Libgeotiff seems like it has a bunch of things that we (it is a team
>     project) should be using; we don't want to reinvent the wheel (not
>     completely anyway - a bit of learning by doing can be good, though).
>
>     So far the images have just been processed within GE itself, using its
>     Image overlay features.  But that is tedious and awkward.  First
>     step is
>     perhaps a better manual tool that can achieve the same results (an
>     image
>     that is rotated and scaled to fit GE accurately).  A next step is
>     to try
>     and get those manual operations automated so that a large number of
>     images can be done quickly, without intervention.
>
>     For the tagging (approximate lat/long) I was thinking of something to
>     read the TIFF tag data, interface with the database that will
>     yield the
>     lat/long of the image, and then writing that back to the TIFF (now
>     that
>     I know something about GeoTIFF, probably as a GeoTIFF now instead of
>     TIFF).  It looks like listgeo/geotifcp are the tools I would want
>     to be
>     using for doing that.
>
>     So, I am just asking for some guidance from folks who have used these
>     tools and could comment on what might work well for what I am looking
>     for.  If you want more details, let me know.
>
>     Thanks,
>     Justin
>
>
>
>
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