Ubuntu Manpage: d.what.rast - Allows the user to interactively query the category contents of multiple

NAME

       d.what.rast   -  Allows  the user to interactively query the category contents of multiple
       raster map layers at user specified locations within the current geographic region.

KEYWORDS

       display, raster

SYNOPSIS

       d.what.rast
       d.what.rast help
       d.what.rast [-1tc] map=name[,name,...]  [fs=character]   [--verbose]  [--quiet]

   Flags:
       -1
           Identify just one location

       -t
           Terse output. For parsing by programs

       -c
           Print out col/row for the entire map in grid resolution of the region

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       map=name[,name,...]
           Name of existing raster map(s)

       fs=character
           Field separator (terse mode only)
           Default: :

DESCRIPTION

       d.what.rast outputs the category values  and  labels  associated  with  cell(s)  at  user-
       specified location(s) on user-named raster map layer(s).

       The  program  will  query  the  contents  of  raster map layer(s) named by the user on the
       command line. These map layers must exist in the user's current mapset  search  path.   If
       the  user  does not name any raster map layers on the command line, d.what.rast will query
       the category contents of whatever raster map layer is  already  displayed  in  the  active
       frame on the graphics monitor.

       The  program activates the mouse, and expects the user to indicate the cell location(s) to
       be queried by depressing a mouse  button  over  desired  location(s)  within  the  current
       geographic region in the active display frame on the graphic monitor.

NOTES

       Mouse  button return values are as follows: 0 indicates no button was pressed, 1 indicates
       that the left mouse button was pressed, 2 indicates the middle button was pressed,  and  3
       indicates that the right mouse button was pressed.

       d.what.rast  will  always print its output to the terminal screen.  d.what.rast output can
       be redirected into a file; however, if it is, the output will go both to the screen and to
       the file.  For example:

       d.what.rast map=soils,aspect > what.out

       will  both  send d.what.rast output to the screen and capture its output in the file named
       what.out.

       The maximum number of raster map layers that can be queried at one time is 15.

       d.what.vect allows the user to interactively  query  the  category  contents  of  multiple
       vector map layers at user-specified locations.

EXAMPLES

It is helpful, but not necessary, to first display a map to be used for reference in the
active display frame before running d.what.rast. For example, the user might type the
following series of commands and receive the output below.

d.rast map=soils

To first display the soils map in the active frame.

d.what.rast map=soils,aspect

User then moves the mouse to desired location on the displayed soils map layer, and
presses the left mouse button to query the category contents of the soils and aspect maps
at this geographic location. The program then outputs the below information to the user's
terminal.

617112(E) 3732014(N)
soils in PERMANENT (44)Nunn clay loam, NdC
aspect in PERMANENT (20)15 degrees north of west

The first line of output gives the easting (E) and northing (N) coordinates of the
geographic location at which the user clicked the mouse. Subsequent lines give the
selected map(s) name and mapset, map category value (within parentheses), and map category
label corresponding to this user-selected map location.

The query may be repeated as often as desired using the left mouse button. The right
button on the mouse is used to quit the d.what.rast session.

Users can set the -t flag to obtain a terse output from d.what.rast. This is useful when
the user wishes output to be parsed by another program (like awk). If the -t flag is set,
users can also select the field separator used (with the fs=name option), or elect to use
the default : field separator. In this case, the command

d.what.rast -t map=soils,aspect

produces output in the form shown below. The first line of output gives the easting,
northing, and the mouse button return value (see NOTES below). Each subsequent line gives
the map name and its mapset, the category value, and category label of the point specified
on the user-named raster map layers. The default output field separator, a colon, is used
since none was specified on the command line.

617112:3732014:1
soils@PERMANENT:44:Nunn clay loam, NdC
aspect@PERMANENT:20:15 degrees north of west

Users can also use this program inside of shell scripts that require as input a map
category value and a mouse button depressed. Users can choose an option to run
d.what.rast only once, and return only the map category value found and the number of the
mouse button depressed.

AUTHOR

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

       Last changed: $Date: 2013-04-13 03:41:41 -0700 (Sat, 13 Apr 2013) $

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