1gdal_sieve(1) General Commands Manual gdal_sieve(1)
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6 gdal_sieve - .TH "gdal_sieve" 1 "Fri Apr 22 2011" "GDAL"
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9 gdal_sieve - removes small raster polygons
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12 gdal_sieve.py [-q] [-st threshold] [-4] [-8] [-o name=value]
13 srcfile [-nomask] [-mask filename] [-of format] [dstfile]
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16 The gdal_sieve.py script removes raster polygons smaller than a
17 provided threshold size (in pixels) and replaces replaces them with the
18 pixel value of the largest neighbour polygon. The result can be written
19 back to the existing raster band, or copied into a new file.
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21 Additional details on the algorithm are available in the
22 GDALSieveFilter() docs.
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24 -q:
25 The script runs in quiet mode. The progress monitor is supressed
26 and routine messages are not displayed.
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28 -st threshold:
29 Set the size threshold in pixels. Only raster polygons smaller than
30 this size will be removed.
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32 -o name=value:
33 Specify a special argument to the algorithm. Currently none are
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36 -4:
37 Four connectedness should be used when determining polygons. That
38 is diagonal pixels are not considered directly connected. This is
39 the default.
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41 -8:
42 Eight connectedness should be used when determining polygons. That
43 is diagonal pixels are considered directly connected.
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45 srcfile
46 The source raster file used to identify target pixels. Only the
47 first band is used.
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49 -nomask:
50 Do not use the default validity mask for the input band (such as
51 nodata, or alpha masks).
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53 -mask filename:
54 Use the first band of the specified file as a validity mask (zero
55 is invalid, non-zero is valid).
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57 dstfile
58 The new file to create with the filtered result. If not provided,
59 the source band is updated in place.
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61 -of format:
62 Select the output format. The default is GeoTIFF (GTiff). Use the
63 short format name.
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66 Frank Warmerdam <warmerdam@pobox.com>
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70GDAL Fri Apr 22 2011 gdal_sieve(1)