I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3…but on Windows 7.
I "just" want to merge my raster.
I've got a folder with 50 GTiff raster from Lidar data.
The aim is to merge raster before or after an import into GRASS in order to do some contours…
Before GRASS, I tried gdal_merge with QGIS's gui, without any option. I had an error message : "permission denied".
So I tried it in GRASS with r.patch but :
First the gui don't allows you to select multiple raster at one time…
Then I don't know how to batch with GRASS functions in Windows…I tried the GRASS command line but can't locate in the current mapset (didn't understand how). When I had the windows installer for QGIS, this commandline putted you in the current mapset but it's not the case with the basic installation of QGIS.
I'm quite locked…Any help ?
Best Answer
MSYS
(It should have been downloaded along if you used OSGeo4W utility to install qgis)cd
(Change Directory) to your folder with your data.cd c:/(path to)/(my data)/
(Hint: pressing tab, autocompletes)gdal_merge.py -o out.tif $(ls *.tif)
out.tif
-> is your output file, name it to whatever you want.$(ls *.tif)
-> lists all the files ending with tif, and parses it at a parameter to gdal_merge. Change it as needed.you can explore more options of gdal_merge.py at the relevant page.