gdal_merge.py

mosaics a set of images

SYNOPSIS

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

DESCRIPTION

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.

-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.