1gdal_contour(1)             General Commands Manual            gdal_contour(1)
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NAME

6       gdal_contour - .TH "gdal_contour" 1 "Fri Apr 22 2011" "GDAL"
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NAME

9       gdal_contour - builds vector contour lines from a raster elevation
10       model
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SYNOPSIS

13       Usage: gdal_contour [-b <band>] [-a <attribute_name>] [-3d] [-inodata]
14                           [-snodata n] [-f <formatname>] [-i <interval>]
15                           [-off <offset>] [-fl <level> <level>...]
16                           [-nln <outlayername>]
17                           <src_filename> <dst_filename>
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DESCRIPTION

20       This program generates a vector contour file from the input raster
21       elevation model (DEM).
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23       Starting from version 1.7 the contour line-strings will be oriented
24       consistently. The high side will be on the right, i.e. a line string
25       goes clockwise around a top.
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27       -b band:
28           picks a particular band to get the DEM from. Defaults to band 1.
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30       -a name:
31           provides a name for the attribute in which to put the elevation. If
32           not provided no elevation attribute is attached.
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34       -3d:
35           Force production of 3D vectors instead of 2D. Includes elevation at
36           every vertex.
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38       -inodata:
39           Ignore any nodata value implied in the dataset - treat all values
40           as valid.
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42       -snodata value:
43           Input pixel value to treat as 'nodata'.
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45       -f format:
46           create output in a particular format, default is shapefiles.
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48       -i interval:
49           elevation interval between contours.
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51       -off offset:
52           Offset from zero relative to which to interpret intervals.
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54       -fl level:
55           Name one or more 'fixed levels' to extract.
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57       -nln outlayername:
58           Provide a name for the output vector layer. Defaults to 'contour'.
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EXAMPLE

61       This would create 10meter contours from the DEM data in dem.tif and
62       produce a shapefile in contour.shp/shx/dbf with the contour elevations
63       in the 'elev' attribute.
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65       gdal_contour -a elev dem.tif contour.shp -i 10.0
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AUTHORS

68       Frank Warmerdam <warmerdam@pobox.com>, Silke Reimer
69       <silke@intevation.de>
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73GDAL                            Fri Apr 22 2011                gdal_contour(1)
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