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   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.

   The input coordinates can be entered directly on the command line, or
   redirected via stdin from an input text file, script, or piped from
   another program (like [1]d.where).

   If none of the above input methods are used and the module is run from
   the terminal prompt, the program will interactively query the user for
   point locations and labels.

   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" must be typed after the last pair of input coordinates.

   r.what output consists of the input geographic location and label, and,
   for each user-named raster map layer, the category value, and (if the
   -f label flag is specified) the category label associated with the
   cell(s) at this geographic location.

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    Input from stdin on the command line

   Input coordinates may be given directly from stdin, for example:
   (input data appears between the "EOF" markers)

r.what input=soils,aspect << EOF
635342.21 7654321.09 site 1
653324.88 7563412.42 site 2
EOF

635342.21|7654321.09|site 1|45|21
653324.88|7563412.42|site 2|44|20

echo "635342.21 7654321.09" | r.what input=soils,aspect

635342.21|7654321.09|45|21

    Input from a text file containing coordinates

   The contents of an ASCII text file can be redirected to r.what as
   follows. If we have a file called input_coord.txt containing the
   coordinates and labels given in the example above:

r.what input=soils,aspect < input_coord.txt

635342.21|7654321.09|site 1|45|21
653324.88|7563412.42|site 2|44|20

    Input coordinates given as a module option

   The module's east_north parameter can be used to enter coordinate pairs
   directly. The maximum number of pairs will be limited by your system's
   maximum input line length (e.g. 4096 characters).

r.what input=soils,aspect east_north=635342.21,7654321.09,653324.88,7563412.42

635342.21|7654321.09|45|21
653324.88|7563412.42|44|20

    Input coordinates piped from another program

   The input coordinates may be "piped" from the stdout of another
   program. For example:

d.where | r.what input=soils,aspect

635342.21|7654321.09|45|21
653324.88|7563412.42|44|20

   In the next example, vector point coordinates are piped from the
   v.out.ascii module . The standard UNIX program "tr" is used to convert
   the column separators in v.out.ascii's output into spaces for r.what.

v.out.ascii bugsites fs=' ' | r.what input=soils,aspect

    Output containing raster map category labels

   Here we use the -f label flag to enable the output of category labels
   associated with the raster cell(s), as well as values. (categorical
   maps only)

r.what -f input=soils,aspect << EOF
635342.21 7654321.09 site 1
653324.88 7563412.42 site 2
EOF

635342.21|7654321.09|site 1|45|NaC|21|30 degrees NW
653324.88|7563412.42|site 2|44|NdC|20|15 degrees NW

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   The maximum number of raster map layers that can be queried at one time
   is 150.

СÐ. ТÐÐÐÐ

   [2]d.where, [3]r.category, [4]r.report, [5]r.stats, [6]r.series,
   [7]r.univar, [8]v.what, [9]v.what.rast, [10]v.what.vect

ÐÐТÐÐ

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

   Last changed: $Date: 2007-10-10 03:01:00 -0500 (СÑ, 10 Ð¾ÐºÑ 2007) $

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References

   1. file://localhost/root/tmp/2/fin/d.where.html
   2. file://localhost/root/tmp/2/fin/d.where.html
   3. file://localhost/root/tmp/2/fin/r.category.html
   4. file://localhost/root/tmp/2/fin/r.report.html
   5. file://localhost/root/tmp/2/fin/r.stats.html
   6. file://localhost/root/tmp/2/fin/r.series.html
   7. file://localhost/root/tmp/2/fin/r.univar.html
   8. file://localhost/root/tmp/2/fin/v.what.html
   9. file://localhost/root/tmp/2/fin/v.what.rast.html
  10. file://localhost/root/tmp/2/fin/v.what.vect.html