New answers tagged gdal-merge
It is nearest neighbor as written in http://lists.osgeo.org/pipermail/gdal-dev/2006-November/010619.html There is also a hint in the mail "If you want control over the resampling used, you should use gdalwarp instead."
If you can do from osgeo import gdal,ogr your GDAL was built with the Python bindings otherwise you wouldn't be able to import it. If you want to start a GDAL utility (gdalwarp, gdal_translate, gdal_merge) from within Python your best bet is to use Pythons subprocess module as these utilities are spawned from the command line. An example: import ...
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