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d.where - Identifies the geographic coordinates associated with point locations given in display coordinates.


display, sampling, position, querying


d.where --help
d.where [-dlwf] [at=x,y[,x,y,...]] [input=name] [--help] [--verbose] [--quiet] [--ui]


Output lat/long in decimal degree
Output lat/long referenced to current ellipsoid
Output lat/long referenced to WGS84 ellipsoid using datum transformation parameters defined in current location (if available)
Output frame coordinates of current display monitor (percentage)
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


Display coordinates to convert
File from which to read coordinates ("-" to read from stdin)

Table of contents


d.where is an interactive program that allows the user, using the pointing device (mouse), to identify the geographic coordinates associated 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 currently located beneath the mouse pointer. A mouse-button menu is presented so the user knows which mouse buttons to use. The output is always 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 module.


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).


Query position in map (North Carolina sample dataset):
d.rast elevation


d.what.rast, d.what.vect, g.region, v.what.rast, v.what.vect


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


Available at: d.where source code (history)

Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843

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