GDAL_MERGE(1) GDAL GDAL_MERGE(1)
NAME
gdal_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>
Select the output format. Starting with GDAL 2.3, if not speci-
fied, the format is guessed from the extension (previously was
GTiff). Use the short format name.
-co <NAME=VALUE>
Many formats have one or more optional creation options that can
be used to control particulars about the file created. For in-
stance, the GeoTIFF driver supports creation options to control
compression, and whether the file should be tiled.
The creation options available vary by format driver, and some
simple formats have no creation options at all. A list of op-
tions supported for a format can be listed with the --formats
command line option but the documentation for the format is the
definitive source of information on driver creation options.
See raster_drivers format specific documentation for legal cre-
ation options for each format.
-ot <type>
Force the output image bands to have a specific data type sup-
ported by the driver, which may be one of the following: Byte,
UInt16, Int16, UInt32, Int32, Float32, Float64, CInt16, CInt32,
CFloat32 or CFloat64.
-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 (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>
Assign a specified nodata value to output bands.
-init <"value(s)">
Pre-initialize the output image bands with these values. How-
ever, 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 initial-
ized to 255.
gdal_merge.py -init "0 0 255" -o out.tif in1.tif in2.tif
AUTHOR
Frank Warmerdam <warmerdam@pobox.com>, Silke Reimer <silke@inteva-
tion.de>
COPYRIGHT
1998-2021
Dec 27, 2021 GDAL_MERGE(1)
Generated by dwww version 1.14 on Tue Apr 22 12:38:43 CEST 2025.