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d.thematic.area

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d.thematic.area: Displays a thematic vector area map in the active frame on the graphics monitor.

NAME
d.thematic.area - Displays a thematic vector area map in the active frame on the graphics monitor.
KEYWORDS
display

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 = 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 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

SEE ALSO

v.class d.vect v.univar
AUTHOR
Moritz Lennert Full index (C) 2003-2010 GRASS Development Team D.THEMATIC.AREA(1)
 
 
 

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