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d.histogram(1) GRASS GIS User's Manual d.histogram(1)

d.histogram - Displays a histogram in the form of a pie or bar chart for a user-specified raster map.

display, histogram, statistics

d.histogram
d.histogram --help
d.histogram [-nc] map=name [style=string] [color=name] [bgcolor=name] [nsteps=integer] [--help] [--verbose] [--quiet] [--ui]

-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

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

d.histogram displays the category-value distribution for a user-specified 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.

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).

Running the command below will generate the bar graph shown in the figure:

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 figure:


g.region raster=landuse96_28m -p
d.histogram map=landuse96_28m style=pie


Figure: Pie graph histogram for landuse map

d.colortable, d.frame, d.graph, d.linegraph, d.mon, d.polar, g.region, r.stats

Dave Johnson
DBA Systems, Inc.
10560 Arrowhead Drive
Fairfax, Virginia 22030

Available at: d.histogram source code (history)

Main index | Display index | Topics index | Keywords index | Graphical index | Full index

© 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual

GRASS 7.8.6

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