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.

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. Grid color can be set with option color. Options text_color and bgcolor set the color of the text and its background.

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.

To draw grid lines at different intervals, e.g. at high latitudes, you can run the module twice, once with direction=east-west at one interval size, and again with direction=north-south at another interval size.

EXAMPLES

To draw a red geographic grid with 30 minute grid spacing, run one of the following commands: 
d.grid -g size=00:30:00 color=red
or 
d.grid -g size=0.5 color=255:0:0
d.grid red grid example
Figure: Showing a geographic grid in red line color
To draw a blue standard rectangular grid at a 500 (meter) spacing run the following: 
d.grid size=500 color=blue
d.grid blue grid example
Figure: Showing a rectangular grid in blue line color

SEE ALSO

d.barscale, d.legend, d.geodesic, d.rhumbline, d.erase, d.frame, d.rast, v.mkgrid

AUTHORS

James Westervelt, U.S. Army Construction Engineering Research Laboratory
Geogrid support: Bob Covill
Border support: Markus Neteler
Text and RGB support: Hamish Bowman
Background color implemented as part of GSoC 2016 by Adam Laza, CTU in Prague

Last changed: $Date$