[Gdal-dev] gdal_translate with -gcp, gdaltindex
naumov at buffalo.edu
Fri Mar 11 17:19:49 EST 2005
Dear Frank and developers,
Thank you for the great work on GDAL. The new 1.2.6 seems to work fine so far
on my Fedora Core 2.
I did encounter a couple of quirks lately with using gdal_translate and
(1) There seems to be a problem with parsing of command arguments to
gdal_translate when -gcp is used. The following:
gdal_translate -of GTiff -gcp 0 0 100 100 1.bmp 1.tif
just returns Usage: ..., but only when <src_dataset> name starts with a digit,
like "1.bmp". If input dataset is changed to "a1.bmp" or there is another
flag after "-gcp 0 0 100 100" then all is fine:
gdal_translate -of GTiff -gcp 0 0 100 100 a1.bmp 1.tif
gdal_translate -of GTiff -gcp 0 0 100 100 -co "TILED=YES" 1.bmp 1.tif
(2) Is there a minimum number of GCPs that can be added to an image?
"gdal_translate" does not complain when only one GCP is given, however
running "gdalinfo" on the output shows no GCPs in it.
Perhaps it does not make sense to add just 1 GCP (since it is not enough to
set up a transform later)? If so, this should be noted in the documentation,
and "gdal_translate" should perhaps give a warning.
(3) A minor problem with "gdaltindex". Running:
gdaltindex index.shp *.tif
ERROR 4: Unable to open index.shp or index.SHP.
However, index.shp is generated and seems to be fine.
Department of Geography
More information about the Gdal-dev