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

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                              d.thematic.area(1grass)