r.profile - Outputs the raster map layer values lying on user-defined line(s).

r.profile

r.profile help

r.profile [-ig] input=string [output=string] [profile=east,north[,east,north,...]] [res=float] [null=string]

Flags:

Parameters:

This program outputs two or four column (with -g) data to stdout or an ASCII file. The default two column output consists of cumulative profile length (in meters) and raster value. The optional four column output consists of easting, northing, cumlative profile length (m), and raster value. Profile end or "turning" points can be set manually with the profile argument or selected interactively from the GRASS monitor by setting the -i flag. The profile resolution, or distance between profile points, is obtained from the current region resolution, or can be manually set with the res argument.

The -i flag allows the user for selecting the profile from the GRASS monitor by clicking the left mouse button along the profile; clicking the right mouse button ends the profile.

The profile parameter can be set to comma separated geographic coordinates for profile line endpoints. The interactive flag (-i) overrides this option.

The res parameter sets the distance between each profile point (resolution). The resolution must be provided in GRASS database units (i.e. decimal degrees for Lat Long databases and meters for UTM). By default r.profile uses the resolution of the current GRASS region.

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

The 2 or 4 column output from r.profile is intended for easy use in other programs. The output can be piped (|) directly into other programs or saved to a file for later use. The 4 column output is compatible with s.in.ascii and can be piped direcly into this program for later plotting.

r.profile -ig input=elev.rast | s.in.ascii output=elev.profile

The 2 column output is compatible with most plotting programs.

The profile resolution is measured exactly from the supplied end or turning" point along the profile. The end of a profile segment will be an exact multiple of the profile resolution and will therefore not always match the end point coordinates entered for the segmanet.

To extract the numbers in scripts, following parameters can be used:

r.profile input=dgm12.5 profile=3570631,5763556 2>/dev/null

This filters out the everything except the numbers.

d.profile, r.what, r.transect

Bob Covill

Last changed: $Date: 2004/02/24 00:29:59 $

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