d.where(1grass) GRASS GIS User's Manual d.where(1grass)
NAME
d.where - Identifies the geographic coordinates associated with point
locations given in display coordinates.
KEYWORDS
display, sampling, position, querying
SYNOPSIS
d.where
d.where --help
d.where [-dlwf] [at=x,y[,x,y,...]] [input=name] [--help] [--ver-
bose] [--quiet] [--ui]
Flags:
-d
Output lat/long in decimal degree
-l
Output lat/long referenced to current ellipsoid
-w
Output lat/long referenced to WGS84 ellipsoid using datum transfor-
mation parameters defined in current location (if available)
-f
Output frame coordinates of current display monitor (percentage)
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
at=x,y[,x,y,...]
Display coordinates to convert
input=name
File from which to read coordinates ("-" to read from stdin)
DESCRIPTION
d.where is an interactive program that allows the user, using the
pointing device (mouse), to identify the geographic coordinates associ-
ated with point locations within the current geographic region in the
active display frame on the graphics monitor.
Each mouse click will output the easting and northing of the point cur-
rently located beneath the mouse pointer. A mouse-button menu is pre-
sented so the user knows which mouse buttons to use. The output is al-
ways printed to the terminal screen; if the output is redirected into a
file, it will be written to the file as well.
Mouse buttons:
Left: where am i
Middle: draw to/from here
Right: quit this
The left mouse button prints the coordinates at the selected point, the
middle mouse button allows you to query two points (they are connected
by a line for convenience). Use the right mouse button to exit the mod-
ule.
NOTES
This program uses the current geographic region setting and active
frame. It is not necessary, although useful, to have displayed a map
in the current frame before running d.where. The -d flag allows the
user to optionally output latitude/longitude coordinates pair(s) in
decimal degree rather than DD:MM:SS format. The -w flag is only valid
if a datum is defined for the current location. If the -f flag is
given the x,y frame coordinates of the active display monitor will be
returned (as a percentage, 0,0 is bottom left).
EXAMPLE
Query position in map (North Carolina sample dataset):
d.rast elevation
d.where
SEE ALSO
d.what.rast, d.what.vect, g.region, v.what.rast, v.what.vect
AUTHORS
James Westervelt,
Michael Shapiro,
U.S. Army Construction Engineering Research Laboratory
SOURCE CODE
Available at: d.where source code (history)
Accessed: unknown
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GRASS 7.8.7 d.where(1grass)
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