[GIS] How to batch “gdal_merge” on Win7 in one command line command

gdal

I want to create a mosaic of all tif files in a directory on windows 7.

How could I create a one-line command in the windows command line to loop through all tifs and merge them all together using gdal_merge.py?

I tried this;

for %i in (*.tif) do gdal_merge.py -of GTiff %i mosaic.tif

but it gives me an error about mosaic not being a supported dataset name??

Best Answer

Your command line will try to merge mosaic.tif (as part of *.tif) with itself. Creating the mosaic in another folder would prevent that.

The correct syntax for batch processing is:

for %%N in (D:\Karten\gdal\gdal2tiles\NL50\*.tif) DO gdal_translate -of vrt -expand rgba %%N D:\Karten\gdal\gdal2tiles\NL50\%%~nN.vrt
gdalbuildvrt -allow_projection_difference index.vrt NL50\*.vrt
pause

This should also work for gdal_merge.py, but I prefer to work with the vrt solution.

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[GIS] GDAL Merge Py on ubuntu many tif tiles into one

gdal_merge.py -o output.tif `ls *.tif`

The back ticks mean execute whatever is inside the back ticks before the main command, so this will find all tif files in current directory, which will then be used as the input to gdal_merge.py.

Instead of backticks, you can also use the $(command) syntax, ie,

gdal_merge.py -o output.tif $(ls *.tif)

is equivalent to the previous.

If you have more complicated search requirements, you can use the unix/linux find command first in conjunction with ls to create a list to pass to gdal_merge.

I just did this successfully with 16 tiffs on ubuntu, so it certainly should work for you.

[GIS] Merge tif files with python

As crmackey notes in his comment, the first element in sys.argv needs to be the current script. You also need to use '-o' instead of 'o' as your first argument for gdal_merge

Try:

sys.path.append('C:/Python27/ArcGIS10.2/Scripts/') 
import gdal_merge as gm 
workspace="D:/Satellitendaten/rapideye/img/testregion/cannyedge/out/"
os.chdir(workspace)

sys.argv[1:] = ['-o', 'out.tif', 'allre1.tif', etc...]

Best Answer

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[GIS] GDAL Merge Py on ubuntu many tif tiles into one

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