I know this kind of problem as been posted previously, but I can't solve my problem with the answers.
I'm running a simple gdal_merge command, but I get shut down every time by permission problems. I'm administrator of the directories, running CMD as Administrator. My account has writing permissions over all the folders I use for this. I'm running on Windows 7, 64bits.
Here is the command:
gdal_merge -o "C:\Users\Catherine Plante\Desktop\SuiviHydroGranby" --optfile "\\Server\DONNEES\MNE\liste.txt"
All I can think of is that GDAL (through OSGeo4W) runs the commands as another user, and that this one is blocked.
Does this make sense?
EDIT: In the end, I had forget to clearly identify the output format. While doing so, I realized that I also had problems with the native format (.img). So this was mostly my fault! Just sad that GDAL identified the problem as a permission problem, rather then an incomplete query.