NAME
d.grid - Overlays a user-specified grid in the active display frame on the graphics monitor.
KEYWORDS
display
SYNOPSIS
d.grid
d.grid help
d.grid [-gwnbt] size=value [color=string] [origin=easting,northing] [bordercolor=string]
Flags:
- -g
- Draw geographic grid (referenced to current ellipsoid)
- -w
- Draw geographic grid (referenced to WGS84 ellipsoid)
- -n
- Disable grid drawing
- -b
- Disable border drawing
- -t
- Disable text drawing
Parameters:
- size=value
- Size of grid to be drawn
- color=string
- Sets the grid color, either a standard GRASS color or R:G:B triplet (separated by colons)
- Default: gray
- origin=easting,northing
- Lines of the grid pass through this coordinate
- Default: 0,0
- bordercolor=string
- Sets the border color, either a standard GRASS color or R:G:B triplet
- Default: brown
DESCRIPTION
d.grid overlays a grid of user-defined size and
color in the active display frame on the graphics monitor.
The grid can be created as a standard rectangular grid or
a geographic grid. The grid will overlay, not overwrite,
the contents of the active display frame.
d.grid can be run non-interactively or
interactively. If the user specifies the grid
size and (optionally) the grid color on
the command line the program will run non-interactively; if
no grid color is given the default will be used.
Alternately, the user may simply type d.grid on the
command line; in this case, the program will prompt the
user for parameter values using the standard GRASS graphical
user interface.
NOTES
d.grid will not erase grids already displayed in
the active graphics display frame by previous invocations
of d.grid; multiple invocations of d.grid
will therefore result in the drawing of multiple grids
inside the active graphics frame. (A command like
d.erase, which erases the
entire contents of the active display frame, must be run to
erase previously drawn grids from the display frame.)
If the user provides a
-g flag a geographic (projected) grid
will be drawn. With the -g flag the size
argument accepts both decimal degrees and colon separated
ddd:mm:ss coordinates (eg. 00:30:00 for half of a degree).
A geographic grid cannot be drawn for a latitude/longitude
or XY projection.
Colors may be standard named GRASS colors (red, green, aqua, etc.) or
a numerical R:G:B triplet, where component values range from 0-255.
The grid drawing may be turned off by using the -n flag.
The border drawing may be turned off by using the -b flag.
The coordinate text may be turned off by using the -t flag.
EXAMPLES
To draw a red geographic grid with 30 minute grid spacing run
either of the following:
d.grid -g size=00:30:00 color=red
or
d.grid -g size=0.5 color=255:0:0
To draw a blue standard rectangular grid at a 500 (meter) spacing run the following:
d.grid size=500 color=blue
SEE ALSO
d.barscale
d.legend
d.geodesic
d.rhumbline
d.erase
d.frame
d.rast
AUTHORS
James Westervelt, U.S. Army Construction Engineering Research Laboratory
Geogrid support: Bob Covill
Border support: Markus Neteler
Text and RGB support: Hamish Bowman
Last changed: $Date: 2005/10/25 12:51:45 $
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