Dori wrote:
Hi,
I have used gdal_merge.py to stitch geotiff images created with a 3rd
party software for a couple of years now.
These programs were moved to new hosts a while ago and from there on,
although the stitching works the output image seems to loose the
projection information when they are created at certain times of day but
not at some other times.
When the projection info is lost, the image cannot be viewed in the 3rd
party software used to create the images been stitched, making it
useless. However, all images can be displayed with ImageMagick or openEV.
Is there any command I could use to make sure the projection information
is stored in the output image at all times?
Dori,
You can use gdalinfo to check the projection information.
I think my intermittent problem might be cause by some memory shortage
on the new hosts at certain times of the day . The input images are not
very big ~4 Mb each and there is 16 of them. The output images are not
that huge either:~22Mb
If this is true then, there is not much I could do to resolve my
immediate problems.
I am no expert so, I may be missing the real cause of the problem.
What makes it hard to guess what it is is the fact that there are no
errors logged as the program work all the time.
I *suspect* you are running into problems that have now been fixed
in GDAL and libtiff. Are you using GDAL 1.6.0? Are you using the latest
libtiff distributed with GDAL or a recent libtiff 4 beta? If not, I
would suggest you upgrade.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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