DESCRIPTION

Currently three rasters with preset operators in between them are supported. The rasters are expected to have the following relation:

a + b -> c

EXAMPLES

Complete example using artificial data

r.in.ascii input=- output=input_1 <<EOF
north: 103
south: 100
east: 103
west: 100
rows: 3
cols: 3
5 * 9
* 5 *
* 5 5
EOF
r.in.ascii input=- output=input_2 <<EOF
north: 103
south: 100
east: 103
west: 100
rows: 3
cols: 3
3 4 4
2 2 2
2 1 1
EOF
r.colors map=input_1,input_2 color=viridis
g.region raster=input_1
r.patch input=input_1,input_2 output=result
d.mon wx0 width=400 height=400 output=r_patch.png
d.explanation.plot a=input_1 b=input_2 c=result

Figure: Resulting image

KNOWN ISSUES

• Issue #3381 prevents d.rast.num to be used with d.mon cairo, so d.mon wx0 needs to be used with this module.
• Issue #3382 prevents usage of centered text with d.mon wx0, so the hardcoded values for text does not work perfectly.
• Issue #3383 prevents d.rast.num to be saved to the image with d.mon wx0, taking screenshot is necessary (with powerful screenshot tool such as Shutter, this also addresses the copping issue below).
• The size of the display must be square to have rasters and their cells as squares, i.e. d.mon wx0 width=400 height=400 must be used. The image needs to be cropped afterwards, e.g. using ImageMagic's mogrify -trim image.png.

SEE ALSO

AUTHORS

Last changed: $Date$