gdal_merge(1) [debian man page]

gdal_merge(1)						      General Commands Manual						     gdal_merge(1)

NAME

       gdal_merge - 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] [-tap] [-separate] [-v] [-pct]
		     [-ul_lr ulx uly lrx lry] [-n nodata_value] [-init "value [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.

       -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.

       -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 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.

       -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
       initalized 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
								  Tue Sep 18 2012						     gdal_merge(1)

Check Out this Related Man Page

thumbnail(1)							   User Commands						      thumbnail(1)

NAME

       thumbnail - create a TIFF file with thumbnail images

SYNOPSIS

       thumbnail [options] input.tif output.tif

DESCRIPTION

       The  thumbnail  command shows how to use the SubIFD tag (#330) to store thumbnail images. thumbnail copies a TIFF Class F facsimile file to
       the output file and, for each image, an 8-bit grayscale thumbnail sketch. The output file contains the thumbnail image with the	associated
       full-resolution page linked below with the SubIFD tag.

       By  default, thumbnail images are 216 pixels wide by 274 pixels high.  Pixels are calculated by sampling and filtering the input image with
       each pixel value passed through a contrast curve.

OPTIONS

       The following options are supported:

       -c	       Specify a contrast curve to apply when generating the thumbnail images. By default, pixel values are passed through a  lin-
		       ear contrast curve that simply maps the pixel value ranges. Alternative curves are as follows:

		       exp50		       50% exponential curve

		       exp60		       60% exponential curve

		       exp70		       70% exponential curve

		       exp80		       80% exponential curve

		       exp90		       90% exponential curve

		       exp		       pure exponential curve

		       linear		       linear curve

       -h	       Specify the height of thumbnail images in pixels.

       -w	       Specify the width of thumbnail images in pixels.

OPERANDS

       The following operands are supported:

       input.tif       The name of the input TIFF file.

       output.tif      The name of the output file.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWTiff			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)

NOTES

       There are no options to control the format of the saved thumbnail images.

       Updated by Breda McColgan, Sun Microsystems Inc., 2004.

SunOS 5.11							    26 Mar 2004 						      thumbnail(1)

Linux and UNIX Man Pages

gdal_merge(1) [debian man page]

Check Out this Related Man Page