trusty (1) d.histogram.1grass.gz

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   [-nqC]   map=name    [style=string]     [color=name]     [bgcolor=name]    [nsteps=integer]
       [--verbose]  [--quiet]

   Flags:
       -n
           Display information for null cells

       -q
           Gather the histogram quietly

       -C
           Report for ranges defined in cats file (fp maps only)

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       map=name
           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 GRASS color, 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-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.

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).

SEE ALSO

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

AUTHOR

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

       Last changed: $Date: 2011-11-08 03:29:50 -0800 (Tue, 08 Nov 2011) $

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