gdal_contour Man page

gdal_contour General Commands Manual gdal_contour

NAME

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

SYNOPSIS

Usage: gdal_contour [-b ] [-a ] [-3d] [-inodata] [-snodata n] [-i ] [-f ] [[-dsco NAME=VALUE] …] [[-lco NAME=VALUE] …] [-off ] [-fl …] [-nln ]

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@pobox.com, Silke Reimer silke@intevation.de

GDAL Tue Apr 5 2016 gdal_contour