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] [bgcolor=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
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
SOURCE CODE
Available at:
d.histogram source code
(history)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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© 2003-2023
GRASS Development Team,
GRASS GIS 8.3.dev Reference Manual