1gdal_polygonize(1)          General Commands Manual         gdal_polygonize(1)
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NAME

6       gdal_polygonizeProduces a polygon feature layer from a raster.
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SYNOPSIS

9       gdal_polygonize.py [-8] [-nomask] [-mask filename] raster_file [-b band]
10                       [-q] [-f ogr_format] out_file [layer] [fieldname]
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DESCRIPTION

13       This utility creates vector polygons for all connected regions of
14       pixels in the raster sharing a common pixel value. Each polygon is
15       created with an attribute indicating the pixel value of that polygon. A
16       raster mask may also be provided to determine which pixels are eligible
17       for processing.
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19       The utility will create the output vector datasource if it does not
20       already exist, defaulting to GML format.
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22       The utility is based on the GDALPolygonize() function which has
23       additional details on the algorithm.
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25       -8:
26           (GDAL >= 1.10) Use 8 connectedness. Default is 4 connectedness.
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28       -nomask:
29           Do not use the default validity mask for the input band (such as
30           nodata, or alpha masks).
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32       -mask filename:
33           Use the first band of the specified file as a validity mask (zero
34           is invalid, non-zero is valid). If not specified, the default
35           validity mask for the input band (such as nodata, or alpha masks)
36           will be used (unless -nomask is specified)
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38       raster_file
39           The source raster file from which polygons are derived.
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41       -b band:
42           The band on raster_file to build the polygons from. Starting with
43           GDAL 2.2, the value can also be set to 'mask', to indicate that the
44           mask band of the first band must be used (or 'mask,band_number' for
45           the mask of a specified band)
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47       -f ogr_format
48           Select the output format. Starting with GDAL 2.3, if not specified,
49           the format is guessed from the extension (previously was GML). Use
50           the short format name
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52       out_file
53           The destination vector file to which the polygons will be written.
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55       layer
56           The name of the layer created to hold the polygon features.
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58       fieldname
59           The name of the field to create (defaults to 'DN').
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61       -q:
62           The script runs in quiet mode. The progress monitor is suppressed
63           and routine messages are not displayed.
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AUTHORS

66       Frank Warmerdam warmerdam@pobox.com
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70GDAL                            Tue Mar 3 2020              gdal_polygonize(1)
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