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r.transect.1grass - Man Page

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


raster, profile, 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]



Output easting and northing in first two columns of four column output


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


map=name [required]

Raster map to be queried

line=east,north,azimuth,distance[,east,north,azimuth,distance,...] [required]

Transect definition


String representing NULL value
Default: *


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.


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.

See Also

r.profile, wxGUI profile tool


Michael Shapiro, U.S. Army Construction Engineering Research Laboratory

Source Code

Available at: r.transect source code (history)

Accessed: Tuesday May 14 13:40:48 2024

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