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# gdal_merge.py

mosaics a set of images

Usage:

    gdal_merge.py [-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 to be created.
-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.
-v:
  Generate verbose output of mosaicing operations as they are done.
-separate:
  Place each input file into a separate stacked band.
-pct:
  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.
-createonly:
  The output file is created (and potentially pre-initialized) but no input image data is copied into it.

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

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