d.thematic.area1grass
Displays a thematic vector area map in the active frame on the graphics monitor.
Usage
d.thematic.area
d.thematic.area help
d.thematic.area [-len]
map=name
column=string
[breaks=string
[,string, ...]]
[algorithm=string]
[nbclasses=integer]
colors=string
[,string, ...]
[layer=integer]
[where=sql_query]
[bwidth=integer]
[bcolor=string]
[render=string]
[legendfile=name]
[--verbose]
[--quiet]
Keywords
display, cartography
Overview
d.thematic.area draws thematic coropleth vector maps based on an attribute column or an expression involving several columns. It takes a number of class breaks (excluding the minimum and maximum values) and a list of colors to apply to the classes (has to be the number of class breaks + 1). The -l flag instructs the module to print legend information (class min | class max | number of observations in class | color) to standard output for futher use in graphical software. When given this flag with the -n flag, the module will only print the legend information without drawing the map. One can used v.class to supply class breaks for d.thematic.area (see example below);
Examples
d.thematic.area -l map=communes3 data=pop breaks=111393.250000,222785.500000,334177.750000 colors=255:0:0,0:255:0,0:0:255,0,0,0
The following example uses a calculated attribute (density = pop/area) and v.class to calculate class breaks and feed them directly into d.thematic.area:
d.thematic.area -l map=communes2 data=pop/area breaks=`v.class -g map=communes2 column=pop/area algo=std nbcla=5` colors=0:0:255,50:100:255,255:100:50,255:0:0,156:0:0
Releases
3 releases since Debian 6.0 (Squeeze); the text changed 2 times.