d.vect.chart(1)

NAME
d.vect.chart - Displays charts of vector data in the active frame on the graphics monitor.

KEYWORDS
display, cartography, chart maps

SYNOPSIS
d.vect.chart
d.vect.chart --help
d.vect.chart [-cl3] map=name [type=string[,string,...]] [layer=string] [chart_type=string] columns=name[,name,...] [size_column=name] [size=integer] [scale=float] [outline_color=name] [colors=name[,name,...]] [max_ref=float[,float,...]] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-c
    Center the bar chart around a data point

-l
    Create legend information and send to stdout

-3
    Create 3D charts

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

map=name [required]
    Name of vector map
    Or data source for direct OGR access

type=string[,string,...]
    Input feature type
    Options: point, line, boundary, centroid, area
    Default: point,line,boundary,centroid

layer=string
    Layer number or name
    Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
    Default: 1

chart_type=string
    Chart type
    Options: pie, bar
    Default: pie

columns=name[,name,...] [required]
    Attribute columns containing data

size_column=name
    Column used for pie chart size

size=integer
    Size of chart (diameter for pie, total width for bar)
    Default: 40

scale=float
    Scale for size (to get size in pixels)
    Default: 1

outline_color=name
    Outline color
    Either a standard color name or R:G:B triplet
    Default: black

colors=name[,name,...]
    Colors used to fill charts
    Either a standard color name or R:G:B triplet
    Default: black

max_ref=float[,float,...]
    Maximum value used for bar plot reference

DESCRIPTION
d.vect.chart displays charts for GRASS vector data in the active frame on the graphics monitor.

NOTES
The charts are positioned as follows:

    •   vector points: on point position,

    •   vector lines: on line centers,

    •   vector areas: on area centroids.
Bar charts are placed with their lower edge starting from the y-coordinate of the feature being symbolized, and centered with respect to the x-coordinate. The -c flag can be used to center the bar chart in both x and y directions.

The ’sizecol’ parameter is proportionate to the radius.

The optional max_ref parameter accepts a list of values that represent the maximum value for each column listed in the values for the parameter columns. These values are used to create a framed bar plot if chart_type is bar (See Example 2).

EXAMPLES

  Example 1
Pie-charts of monthly winter precipitation (North Carolina sample dataset):

g.region vector=nc_state -p
d.vect nc_state
d.vect.chart precip_30ynormals chart_type=pie columns=nov,dec,jan,feb -l
# show pie chart as 3D
d.erase
d.vect nc_state
d.vect.chart precip_30ynormals chart_type=pie columns=nov,dec,jan,feb -l -3

2D pie-chart of monthly winter precipitation in North Carolina

3D pie-chart of monthly winter precipitation in North Carolina

  Example 2
Bar-chart of different census map values:

d.vect.chart map=vectmap columns=cens51,cens61,cens71,cens81 chart_type=bar

  Example 3
Creation of framed bar charts of an erodibiliy index from the Spearfish sample dataset:

g.region raster=erode.index -p
r.to.vect -s input=erode.index output=erode_index type=area
v.extract input=erode_index output=erode_index_ctrds type=centroid
d.rast aspect
d.vect.chart map=erode_index_ctrds chart_type=bar columns=cat \
             size=10 max_ref=12 scale=0.05 colors=yellow
d.vect erode_index_ctrds icon=basic/circle fcol=black col=black size=5

Bar charts of an erodibiliy index (spatial subset)

SEE ALSO
d.erase, d.vect, d.vect.thematic, d.what.vect, d.rast

AUTHOR
Radim Blazek, ITC-Irst, Trento, Italy

SOURCE CODE

Available at: d.vect.chart source code (history)

Accessed: Saturday May 09 11:14:46 2026

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