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]  [--verbose]  [--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  transformation  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 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.

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 project’s coordinate reference
       system.  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: Friday Apr 04 01:18:52 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                      d.where(1grass)