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r.transect(1grass) Grass User's Manual r.transect(1grass)

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

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.

SEE ALSO

r.profile, wxGUI profile tool

AUTHOR

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

Last changed: $Date: 2012-11-25 02:59:42 -0800 (Sun, 25 Nov 2012) $

SOURCE CODE

Available at: r.transect source code (history)

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© 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual

GRASS 7.2.0