GRASS GIS manual: r.transect

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.4, available here.
Updated manual page: here

NAME

r.transect - Outputs raster map layer values lying along user defined transect line(s).

KEYWORDS

raster, transect

SYNOPSIS

r.transect

r.transect --help

r.transect [-g] map=name line=east,north,azimuth,distance[,east,north,azimuth,distance,...] [null_value=string] [--help] [--verbose] [--quiet] [--ui]

Flags:

-g: Output easting and northing in first two columns of four column output
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Raster map to be queried
line=east,north,azimuth,distance[,east,north,azimuth,distance,...] [required]: Transect definition
null_value=string: String representing NULL value; Default: *

DESCRIPTION
NOTES
SEE ALSO
AUTHOR

DESCRIPTION

This program outputs, in ASCII, the values in a raster map which lie along one or more user-defined transect lines. The transects are described by their starting coordinates, azimuth, and distance.

The line parameter is a definition of (each) transect line, specified by the geographic coordinates of its starting point (easting, northing), the angle and direction of its travel (azimuth), and its distance (distance).

The azimuth is an angle, in degrees, measured to the east of north. The distance is in map units (meters for a metered database, like UTM).

The null parameter can optionally be set to change the character string representing null values.

NOTES

This program is a front-end to the r.profile program. It simply converts the azimuth and distance to an ending coordinate and then runs r.profile. There once were width= and result=raw|median|average options which are not currently implemented.