1gdal_sieve(1)               General Commands Manual              gdal_sieve(1)
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NAME

6       gdal_sieveRemoves small raster polygons.
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SYNOPSIS

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

13       The gdal_sieve.py script removes raster polygons smaller than a
14       provided threshold size (in pixels) and replaces replaces them with the
15       pixel value of the largest neighbour polygon. The result can be written
16       back to the existing raster band, or copied into a new file.
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18       The input dataset is read as integer data which means that floating
19       point values are rounded to integers. Re-scaling source data may be
20       necessary in some cases (e.g. 32-bit floating point data with min=0 and
21       max=1).
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23       Additional details on the algorithm are available in the
24       GDALSieveFilter() docs.
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26       -q:
27           The script runs in quiet mode. The progress monitor is suppressed
28           and routine messages are not displayed.
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30       -st threshold:
31           Set the size threshold in pixels. Only raster polygons smaller than
32           this size will be removed.
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34       -o name=value:
35           Specify a special argument to the algorithm. Currently none are
36           supported.
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38       -4:
39           Four connectedness should be used when determining polygons. That
40           is diagonal pixels are not considered directly connected. This is
41           the default.
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43       -8:
44           Eight connectedness should be used when determining polygons. That
45           is diagonal pixels are considered directly connected.
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47       srcfile
48           The source raster file used to identify target pixels. Only the
49           first band is used.
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51       -nomask:
52           Do not use the default validity mask for the input band (such as
53           nodata, or alpha masks).
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55       -mask filename:
56           Use the first band of the specified file as a validity mask (zero
57           is invalid, non-zero is valid).
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59       dstfile
60           The new file to create with the filtered result. If not provided,
61           the source band is updated in place.
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63       -of format:
64           Select the output format. Starting with GDAL 2.3, if not specified,
65           the format is guessed from the extension (previously was GTiff).
66           Use the short format name.
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AUTHORS

69       Frank Warmerdam warmerdam@pobox.com
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73GDAL                            Thu Jul 25 2019                  gdal_sieve(1)
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