DESCRIPTION
r.what outputs the category values and (optionally) the category
labels associated with user-specified locations on raster input map(s).
Locations are specified as geographic x,y coordinate pairs (i.e., pair of
eastings and northings); the user can also (optionally) associate a label
with each location.
If the user does not redirect an input file containing these coordinates
into the program or specify them on the command line, the program will
query the user for point locations and labels.
EXAMPLES
The contents of the ASCII inputfile to r.what can be typed
in at the keyboard, redirected from a file, or piped from another program
(like d.where). Each line of the input
consists of an easting, a northing, and an optional label, which are
separated by spaces. In interactive mode, the word end is typed to
end input of coordinates to r.what. For example:
-
- 635342.21 7654321.09 site 1
- 653324.88 7563412.42 site 2
- end
r.what output consists of the input geographic location and label,
and, for each user-named raster map layer, the category value, and (if
-f is specified) the category label associated with the cell(s) at
this geographic location. Sample input (in regular font) to and output
(in plain text) from r.what are given below.
-
- r.what input=soils,aspect
- 635342.21 7654321.09 site 1
- 653324.88 7563412.42 site 2
- end
-
- 635342.21|7654321.09|site 1|45|21
- 653324.88|7563412.42|site 2|44|20
-
- r.what -f input=soils,aspect
- 635342.21 7654321.09 site 1
- 653324.88 7563412.42 site 2
end
-
- 635342.21|7654321.09|site 1|45|NaC|21|30 degrees NW
- 653324.88|7563412.42|site 2|44|NdC|20|15 degrees NW
Coordinates for query may be entered on the command line directly:
r.what input=soils,aspect east_north=635342.21,7654321.09,653324.88,7563412.42
635342.21|7654321.09|site 1|45|21
653324.88|7563412.42|site 2|44|20
NOTE
The maximum number of raster map layers that can be queried at one time is 150.
SEE ALSO
d.vect,
d.where,
r.cats,
r.report,
r.stats,
r.series,
v.what.rast
AUTHOR
Michael Shapiro,
U.S. Army Construction Engineering Research Laboratory
Last changed: $Date$