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 = 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

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       © 2003-2013 GRASS Development Team