NAME
d.what.rast - Permite la consulta interactiva de los valores
y categorías, en uno o varios mapas raster, pinchando con el ratón
en el monitor gráfico activo.
(GRASS Display Program)
USO
d.what.rast
d.what.rast help
d.what.rast [-1tc] [map=nombre[,nombre,...]]
[fs=nombre]
DESCRIPCION
Si no se especifica los nombres de los mapas, se extraen los valores de
los mapas que han sido dibujados en el monitor gráfico con d.rast.
Para salir del comando, sbe pinchase en el monitor gráfico con
el botón derecho del ratón, de no hacerlo así el monitor
gráfico quedaría colgado dando problemas en su uso
posterior.
OPCIONES
Flags:
-
-1
-
Identifica sólo un punto.
-
-t
-
Simplifica la salida
-
-c
-
Obtiene los valores de fila y columna en lugar de latitud y longitud.
Parámetros:
-
map=nombre
Hasta 15 mapas raster
-
fs=nombre
-
Separador de campos cuando la opción -t está
activada
Por defecto, la salida que produce son las coordenadas UTM del punto seleccionado,
el valor de la categoría y la etiqueta.
EJEMPLO
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. The subsequent
two lines give the map name and mapset, map category value (within parentheses),
and map category label corresponding to this user-selected map location,
for each of the maps queried by the user.
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.
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.
VER
d.rast
d.what.vect
d.where
g.region
parser
AUTOR
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory