1GDAL_CONTOUR(1)                      GDAL                      GDAL_CONTOUR(1)
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NAME

6       gdal_contour  -  Builds  vector  contour  lines from a raster elevation
7       model.
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SYNOPSIS

10          gdal_contour [-b <band>] [-a <attribute_name>] [-amin <attribute_name>] [-amax <attribute_name>]
11                       [-3d] [-inodata]
12                       [-snodata n] [-i <interval>]
13                       [-f <formatname>] [[-dsco NAME=VALUE] ...] [[-lco NAME=VALUE] ...]
14                       [-off <offset>] [-fl <level> <level>...] [-e <exp_base>]
15                       [-nln <outlayername>] [-q] [-p]
16                       <src_filename> <dst_filename>
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DESCRIPTION

19       The gdal_contour generates a vector contour file from the input  raster
20       elevation model (DEM).
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22       The  contour  line-strings  are oriented consistently and the high side
23       will be on the right, i.e. a line string goes clockwise around a top.
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25       -b <band>
26              Picks a particular band to get the DEM from. Defaults to band 1.
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28       -a <name>
29              Provides a name for the attribute in which to put the elevation.
30              If  not provided no elevation attribute is attached.  Ignored in
31              polygonal contouring (-p) mode.
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33       -amin <name>
34              Provides a name for the attribute in which to  put  the  minimum
35              elevation  of contour polygon. If not provided no minimum eleva‐
36              tion attribute is attached. Ignored in default  line  contouring
37              mode.
38
39              New in version 2.4.0.
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42       -amax <name>
43              Provides  a  name  for the attribute in which to put the maximum
44              elevation of contour polygon. If not provided no maximum  eleva‐
45              tion  attribute is attached.  Ignored in default line contouring
46              mode.
47
48              New in version 2.4.0.
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51       -3d    Force production of 3D vectors instead of 2D.   Includes  eleva‐
52              tion at every vertex.
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54       -inodata
55              Ignore  any nodata value implied in the dataset - treat all val‐
56              ues as valid.
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58       -snodata <value>
59              Input pixel value to treat as "nodata".
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61       -f <format>
62              Create output in a particular format.
63
64              New in version 2.3.0: If not specified, the  format  is  guessed
65              from the extension (previously was ESRI Shapefile).
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68       -dsco <NAME=VALUE>
69              Dataset creation option (format specific)
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71       -lco <NAME=VALUE>
72              Layer creation option (format specific)
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74       -i <interval>
75              Elevation interval between contours.
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77       -off <offset>
78              Offset from zero relative to which to interpret intervals.
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80       -fl <level>
81              Name one or more "fixed levels" to extract.
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83       -e <base>
84              Generate  levels on an exponential scale: base ^ k, for k an in‐
85              teger.
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87              New in version 2.4.0.
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89
90       -nln <name>
91              Provide a name for the output vector layer.  Defaults  to  "con‐
92              tour".
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94       -p     Generate contour polygons rather than contour lines.
95
96              New in version 2.4.0.
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99       -q     Be quiet.
100

C API

102       Functionality of this utility can be done from C with GDALContourGener‐
103       ate().
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EXAMPLE

106       This would create 10-meter contours from the DEM data  in  dem.tif  and
107       produce  a shapefile in contour.shp|shx|dbf with the contour elevations
108       in the elev attribute.
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110          gdal_contour -a elev dem.tif contour.shp -i 10.0
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AUTHOR

113       Frank  Warmerdam  <warmerdam@pobox.com>,  Silke  Reimer  <silke@inteva‐
114       tion.de>
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117       1998-2021
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122                                 Sep 07, 2021                  GDAL_CONTOUR(1)
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