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d.vect.chart.1grass

NAME

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

KEYWORDS

display, cartography

SYNOPSIS

d.vect.chart
d.vect.chart help
d.vect.chart [-cl] map=name [type=string[,string,...]] [layer=integer] [ctype=string] columns=string[,string,...] [sizecol=string] [size=integer] [scale=float] [ocolor=string] [colors=string[,string,...]] [max_ref=float[,float,...]] [--verbose] [--quiet]

Flags:

-c

Center the bar chart around a data point

-l

Create legend information and send to stdout

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

map=name

Name of input vector map

type=string[,string,...]

Feature type
Options: point,line,boundary,centroid,area
Default: point,line,boundary,centroid

layer=integer

Layer number
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 1

ctype=string

Chart type
Options: pie,bar
Default: pie

columns=string[,string,...]

Attribute columns containing data

sizecol=string

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

ocolor=string

Outline color
Default: black

colors=string[,string,...]

Colors used to fill charts

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 ctype is bar (See Example 2).

EXAMPLES

Example 1

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

Example 2

Create framed bar graphs of an erodibiliy index from the SPEARFISH dataset.
r.to.vect -s -v in=erode.index out=erode_index feature=area
v.extract in=erode_index out=erode_index_ctrds type=centroid
d.rast aspect
d.vect.chart map=erode_index_ctrds ctype=bar columns=cat \

             size=10 max_ref=12 scale=1.5 colors=yellow 
d.vect erode_index_ctrds icon=basic/circle fcol=black col=black size=5
Example screenshot (zoomed):

SEE ALSO

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

AUTHOR

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2007-06-02 22:46:58 +0200 (sab, 02 giu 2007) $

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© 2003-2010 GRASS Development Team