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       gdal_merge - mosaics a set of images

SYNOPSIS [-o out_filename] [-of out_format] [-co NAME=VALUE]*
                            [-ps pixelsize_x pixelsize_y] [-separate] [-v] [-pct]
                            [-ul_lr ulx uly lrx lry] [-n nodata_value] [-init value]
                            [-ot datatype] [-createonly] input_files


       This utility will automatically mosaic a set of images. All the images
       must be in the same coordinate system and have a matching number of
       bands, but they may be overlapping, and at different resolutions.

       -o out_filename:
           The name of the output file, which will be created if it does not
           already exist (defaults to ’out.tif’).

       -of format:
           Output format, defaults to GeoTIFF (GTiff).

       -co NAME=VALUE:
           Creation option for output file. Multiple options can be specified.

       -ot datatype:
           Force the output image bands to have a specific type. Use type
           names (ie. Byte, Int16,...)

       -ps pixelsize_x pixelsize_y:
           Pixel size to be used for the output file. If not specified the
           resolution of the first input file will be used.

       -ul_lr ulx uly lrx lry:
           The extents of the output file. If not specified the aggregate
           extents of all input files will be used.

           Generate verbose output of mosaicing operations as they are done.

           Place each input file into a separate stacked band.

           Grab a pseudocolor table from the first input image, and use it for
           the output. Merging pseudocolored images this way assumes that all
           input files use the same color table.

       -n nodata_value:
           Ignore pixels from files being merged in with this pixel value.

       -init value:
           Pre-initialize the output file with this value. However, it is not
           marked as the nodata value in the output file.

           The output file is created (and potentially pre-initialized) but no
           input image data is copied into it.

       NOTE: is a Python script, and will only work if GDAL was
       built with Python support.


       Frank Warmerdam <>, Silke Reimer