Hi,
By the way, which OTB version are you using ?
I don't think you need this kind of directory structure. The "DEM
Directory" generally contains the whole set of SRTM tiles (in the .hgt
format, for instance : N43E001.hgt).
Here is what I tried on my side :
- using gdal_translate to convert one SRTM tile into TIF.
- I move the TIF tile alone in a separate folder.
- I do an ortho-rectification using standard SRTM folder : -elev.dem
DEM/srtm_directory -elev.geoid DEM/egm96.grd
- I do an ortho-rectification using the TIF file : -elev.dem
my_tile.tif -elev.geoid DEM/egm96.grd
- both ortho-images are the same.
Note that in each case, I set the geoid.You could try to generate a
custom DEM tile with the same footprint as a standard SRTM tile.
Regards,
Guillaume
Le 19/09/2014 07:53, emre a écrit :
Hi,
I did quite a few experiments and I dont think tiff files are
supported that easily. The directory name is important (e.g., E20
doesnt work but it should be E020). Also, if there is no .hgt or .DT2
file inside the directory, the
otb:DEMHandler::Instance()->OpenDEMDirectory() function gets an
exception. I changed the name of the tiff file to supported hgt and
dt2 formats but I couldnt make it work. Frankly, it would be
excellent, if you can provide a directory structure and a file name
that you believe to be appropriate for the task. As an example, I used
a directory structure something like:
D:\myFiles\E020\N43.tif
and I provided "D:\myFiles\" as the dem directory. When there is a
.hgt file or a .dt2 file, the
otb:DEMHandler::Instance()->OpenDEMDirectory() function works
flawlessly but my tif file (which has coordinate information for sure)
doesnt seem to be working. I wish we still had the good old way of
providing the dem file as it is.
All the best
Emre
On Thursday, September 18, 2014 7:01:06 PM UTC+3, Guillaume Pasero wrote:
Hi,
In the Orthorectification application, you can give the path to
your TIFF DEM using the same setting "DEM directory". The TIFF
file will be used by the DEM handler as long as it has its
projection information embedded.
Maybe you should also give a default elevation above ellipsoid so
that the DEM handler returns a reasonable value outside your TIFF
DEM. However I don't know precisely its behaviour in this case.
Regards,
Guillaume
Le 18/09/2014 16:43, emre a écrit :
Hi. I have a small DEM that was generated via orfeo (in tiff
format). How can use that file to orthorectify the left image of
the stereo pair? Should I use setdemdirectorypath as usual (the
dem I have is lat-long projection but it is very small piece of
image patch)? If tiff format ok? Is otbdemhandler capable of
reading that info?
All the best
Emre
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<https://thor.si.c-s.fr/blogs/cs-blogs-business/>*- Département
APPLICATIONS*
*CS Systèmes d'Information*
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31506 Toulouse Cedex 05 - FRANCE
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