Hi, I tried gdal_merge.py but I got a memory Error because I use the -n nodata value option. Several threads sugest that I must use gdalwrap instead. This behavior of gdal_merge.py is very important to me in this particular case "In areas of overlap, the last image will be copied over earlier ones".
Does gdalwrap has the same behavior? (I ask because it is difficult to test and validate with my data)? Also, the doc says "Mosaicing into an existing output file is supported if the output file already exists." But how? What is the option to append data? When launching a command for another image it says that I must delete the output file. I would appreciate if someone could validate if this gdalwarp -srcnodata -3.4028234663852886e+38 -dstnodata -3.4028234663852886e+38 -of "GTiff" EstRN.img icu.tif is the equivalent of this gdal_merge.py -n -3.4028234663852886e+38 -o icu.tif -of "GTiff" EstRN.img EstSh.img It works but maybe some more parameters are important. Thanks for your help, Steve Steve Toutant, M. Sc. Analyste en géomatique Secteur environnement Direction des risques biologiques, environnementaux et occupationnels Institut national de santé publique du Québec 945, avenue Wolfe Québec, Qc G1V 5B3 Tél.: (418) 650-5115 #5281 Fax.: (418) 654-3144 [email protected] http://www.inspq.qc.ca
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