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

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


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


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);


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


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

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