d.histogram(1grass) GRASS GIS User's Manual d.histogram(1grass)
NAME
d.histogram - Displays a histogram in the form of a pie or bar chart
for a user-specified raster map.
KEYWORDS
display, histogram, statistics
SYNOPSIS
d.histogram
d.histogram --help
d.histogram [-nc] map=name [style=string] [color=name] [bg-
color=name] [nsteps=integer] [--help] [--verbose] [--quiet]
[--ui]
Flags:
-n
Display information for null cells
-c
Report for ranges defined in cats file (fp maps only)
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
map=name [required]
Raster map for which histogram will be displayed
style=string
Indicate if a pie or bar chart is desired
Options: pie, bar
Default: bar
color=name
Color for text and axes
Either a standard color name or R:G:B triplet
Default: black
bgcolor=name
Background color
Either a standard color name, R:G:B triplet, or "none"
Default: white
nsteps=integer
Number of steps to divide the data range into (fp maps only)
Default: 255
DESCRIPTION
d.histogram displays the category-value distribution for a user-speci-
fied raster map layer, in the form of a bar chart or a pie chart. The
display will be displayed in the active display frame on the graphics
monitor, using the colors in the raster map layer’s color table. The
program determines the raster map’s category value distribution by
counting cells.
NOTES
d.histogram respects the current geographic region settings and the
current MASK (if one exists).
d.histogram uses the colors in the map’s color look-up table (i.e., the
map’s colr or colr2 file).
EXAMPLES
Running the command below will generate the bar graph shown in the fig-
ure:
g.region raster=elevation -p
d.mon wx0
d.histogram map=elevation
Figure: Bar graph histogram for elevation map
Running the command below will generate the pie graph shown in the fig-
ure:
g.region raster=landuse96_28m -p
d.histogram map=landuse96_28m style=pie
Figure: Pie graph histogram for landuse map
SEE ALSO
d.colortable, d.frame, d.graph, d.linegraph, d.mon, d.polar, g.region,
r.stats
AUTHOR
Dave Johnson
DBA Systems, Inc.
10560 Arrowhead Drive
Fairfax, Virginia 22030
SOURCE CODE
Available at: d.histogram source code (history)
Accessed: unknown
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GRASS 7.8.7 d.histogram(1grass)
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