NAME¶
gdal_contour - gdal_contour builds vector contour lines from a raster elevation
model
SYNOPSIS¶
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>
DESCRIPTION¶
This program generates a vector contour file from the input raster elevation
model (DEM).
Starting from version 1.7 the contour line-strings will be oriented
consistently. The high side will be on the right, i.e. a line string goes
clockwise around a top.
- -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.
- -3d:
- Force production of 3D vectors instead of 2D. Includes
elevation at every vertex.
- -inodata:
- 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'.
EXAMPLE¶
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
AUTHORS¶
Frank Warmerdam warmerdam@pobox.com, Silke Reimer silke@intevation.de