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       gdal_contour - gdal_contour builds vector contour lines from a raster
       elevation model


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


       This program generates a vector contour file from the input raster
       elevation model (DEM).

       -b band:
           picks a particular band to get the DEM from. Defaults to band 1.

       -a name:
           provides a name for the attribute in which to put the elevation. If
           not provided no elevation attribute is attached.

           Force production of 3D vectors instead of 2D. Includes elevation at
           every vertex.

           Ignore any nodata value implied in the dataset - treat all values
           as valid.

       -snodata value:
           Input pixel value to treat as ’nodata’.

       -f format:
           create output in a particular format, default is shapefiles.

       -i interval:
           elevation interval between contours.

       -off offset:
           Offset from zero relative to which to interpret intervals.

       -fl level:
           Name one or more ’fixed levels’ to extract.

       -nln outlayername:
           Provide a name for the output vector layer. Defaults to ’contour’.


       This would create 10meter contours from the DEM data in dem.tif and
       produce a shapefile in contour.shp/shx/dbf with the contour elevations
       in the ’elev’ attribute.

       gdal_contour -a elev dem.tif contour.shp -i 10.0


       Frank Warmerdam <>, Silke Reimer