gdal_merge(1)gdal_merge(1)NAMEgdal_merge - Mosaics a set of images.
SYNOPSIS
gdal_merge.py [-o out_filename] [-of out_format] [-co NAME=VALUE]*
[-ps pixelsize_x pixelsize_y] [-tap] [-separate] [-q] [-v] [-pct]
[-ul_lr ulx uly lrx lry] [-init "value [value...]"]
[-n nodata_value] [-a_nodata output_nodata_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. In
areas of overlap, the last image will be copied over earlier ones.
-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.
See format specific documentation for legal creation options for
each format
-ot datatype:
Force the output image bands to have a specific type. Use type
names (i.e. 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.
-tap:
(GDAL >= 1.8.0) (target aligned pixels) align the coordinates of
the extent of the output file to the values of the -tr, such that
the aligned extent includes the minimum extent.
-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 band.
-pct:
Grab a pseudo-color table from the first input image, and use it
for the output. Merging pseudo-colored 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.
-a_nodata output_nodata_value:
(GDAL >= 1.9.0) Assign a specified nodata value to output bands.
-init 'value(s)':
Pre-initialize the output image bands with these values. However,
it is not marked as the nodata value in the output file. If only
one value is given, the same value is used in all the bands.
-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.
EXAMPLE
Create an image with the pixels in all bands initialized to 255.
% gdal_merge.py -init 255 -o out.tif in1.tif in2.tif
Create an RGB image that shows blue in pixels with no data. The first
two bands will be initialized to 0 and the third band will be
initialized to 255.
% gdal_merge.py -init "0 0 255" -o out.tif in1.tif in2.tif
AUTHORS
Frank Warmerdam warmerdam@pobox.com, Silke Reimer silke@intevation.de
GDAL Sun Dec 17 2017 gdal_merge(1)
