gdal_contour

Langue: en

Version: 336789 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME

gdal_contour - .TH "gdal_contour" 1 "Wed Sep 29 2010" "GDAL"

NAME

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).

-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>