gdal_contour (1) Linux Manual Page

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][-i<interval>]
                    [-f<formatname>][[-dsco NAME = VALUE]...][[-lco NAME = VALUE]...]
                    [-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.

-dsco NAME=VALUE:

Dataset creation option (format specific)

-lco NAME=VALUE:

Layer creation option (format specific)

-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 [at] pobox.com, Silke Reimer silke [at] intevation.de

Index