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gdal_sieve - gdal_sieve.py removes small raster polygons


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


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

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

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

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

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

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

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

Do not use the default validity mask for the input band (such as nodata, or alpha

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

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.


Frank Warmerdam warmerdam@pobox.com

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