gdal_sieve man page on Kali

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gdal_sieve(1)							 gdal_sieve(1)

NAME
       gdal_sieve - Removes small raster polygons.

SYNOPSIS
       gdal_sieve.py [-q] [-st threshold] [-4] [-8] [-o name=value]
		  srcfile [-nomask] [-mask filename] [-of format] [dstfile]

DESCRIPTION
       The gdal_sieve.py script removes raster polygons smaller than a
       provided threshold size (in pixels) and replaces replaces them with the
       pixel value of the largest neighbour polygon. The result can be written
       back to the existing raster band, or copied into a new file.

       The input dataset is read as integer data which means that floating
       point values are rounded to integers. Re-scaling source data may be
       necessary in some cases (e.g. 32-bit floating point data with min=0 and
       max=1).

       Additional details on the algorithm are available in the
       GDALSieveFilter() docs.

       -q:
	   The script runs in quiet mode. The progress monitor is suppressed
	   and routine messages are not displayed.

       -st threshold:
	   Set the size threshold in pixels. Only raster polygons smaller than
	   this size will be removed.

       -o name=value:
	   Specify a special argument to the algorithm. Currently none are
	   supported.

       -4:
	   Four connectedness should be used when determining polygons. That
	   is diagonal pixels are not considered directly connected. This is
	   the default.

       -8:
	   Eight connectedness should be used when determining polygons. That
	   is diagonal pixels are considered directly connected.

       srcfile
	   The source raster file used to identify target pixels. Only the
	   first band is used.

       -nomask:
	   Do not use the default validity mask for the input band (such as
	   nodata, or alpha masks).

       -mask filename:
	   Use the first band of the specified file as a validity mask (zero
	   is invalid, non-zero is valid).

       dstfile
	   The new file to create with the filtered result. If not provided,
	   the source band is updated in place.

       -of format:
	   Select the output format. The default is GeoTIFF (GTiff). Use the
	   short format name.

AUTHORS
       Frank Warmerdam warmerdam@pobox.com

GDAL				Sun Dec 17 2017			 gdal_sieve(1)
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