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NAME
d.thematic.area - Displays a thematic vector area map in the active frame on the graphics monitor.
KEYWORDS
display, cartography
SYNOPSIS
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]
Flags:
- -l
- Create legend information and send to stdout
- -e
- When printing legend info, include extended statistical info from classification algorithm
- -n
- Do not draw map, only output the legend
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- map=name
- Name of input vector map
- column=string
- Data to be classified: column name or expression
- breaks=string[,string,...]
- Class breaks, without minimum and maximum
- algorithm=string
- Algorithm to use for classification
- Options: int,std,qua,equ,dis
- int: simple intervals
- std: standard deviations
- qua: quantiles
- equ: equiprobable (normal distribution)
- nbclasses=integer
- Number of classes to define
- colors=string[,string,...]
- Colors (one per class).
- layer=integer
- Layer number
- Layer number. If -1, all layers are displayed.
- Default: 1
- where=sql_query
- WHERE conditions of SQL statement without 'where' keyword
- Example: income < 1000 and inhab >= 10000
- bwidth=integer
- Boundary width
- Default: 0
- bcolor=string
- Boundary color
- Default: black
- render=string
- Rendering method for filled polygons
- Options: d,c,l
- Default: l
- d: use the display library basic functions (features: polylines)
- c: use the display library clipping functions (features: clipping)
- l: use the display library culling functions (features: culling, polylines)
- legendfile=name
- File in which to save d.graph instructions for legend display
DESCRIPTION
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);
EXAMPLE
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
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
SEE ALSO
v.class
d.vect
v.univar
AUTHOR
Moritz Lennert
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