d.explanation.plot - GRASS GIS manual

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NAME

d.explanation.plot - Draw a plot of multiple rasters to explain a raster operation for example a + b = c

KEYWORDS

display, manual, raster

SYNOPSIS

d.explanation.plot

d.explanation.plot --help

d.explanation.plot a=name b=name c=name [label_a=string] [label_b=string] [label_c=string] [--help] [--verbose] [--quiet] [--ui]

Flags:

--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

a=name [required]: Name of input raster map
b=name [required]: Name of input raster map
c=name [required]: Name of input raster map
label_a=string: Label above the raster
label_b=string: Label above the raster
label_c=string: Label above the raster

DESCRIPTION
EXAMPLES
- Complete example using artificial data
KNOWN ISSUES
SEE ALSO
AUTHOR

DESCRIPTION

d.explantion.plot creates a plot of rasters and their relations which can serve as an explanation of a raster operation performed by a module or function.

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.