NAME
r.profile - Outputs the raster map layer values
lying on user-defined line(s).
(GRASS Raster Program)
SYNOPSIS
r.profile
r.profile help
r.profile [-g] [-i]
input=name output=name
profile=east,north[,east,north,east,north,...]
res=resolution
null=string
DESCRIPTION
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.
OPTIONS
Flags:
- -g
- Output easting and northing in first two columns of four column output
- -i
- Interactive mode
- The user selects the profile from the GRASS monitor by clicking the left mouse button along the profile, clicking the right mouse button ends the profile
Parameters:
- input
- The name of the GRASS raster file from which to generate the profile info
- output
- The name of the 2 or 4 column ASCII file to send profile results to
- Use "-" to send output to standard output (stdout)
- profile
- The comma separated geographic coordinates for profile line endpoints
- The interactive flag (-i) overrides this option
- res
- This sets the distance between each profile point (resolution)
- The resolution must be provided in GRASS database units (i.e. decimal degrees for Lat Long database and meters for UTM)
- By default r.profile uses the resolution of the current GRASS region
- null
- Character string to represent no data cell
OUTPUT FORMAT
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 sites=elev.profile
The 2 column output is compatible with most plotting programs.
NOTES
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.
SEE ALSO
d.profile
r.what
r.transect
AUTHOR
Bob Covill
Last changed: $Date: 2004/02/24 00:06:26 $