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       d.vect.thematic  - Displays thematic vector map


       display, vector, thematic, legend


       d.vect.thematic help
       d.vect.thematic    [-glfusm]   map=string   type=string   column=string   themetype=string
       themecalc=string  [breakpoints=string]    [layer=integer]    [icon=string]    [size=float]
       [maxsize=float]         [nint=integer]        colorscheme=string       [pointcolor=string]
       [linecolor=string]      [startcolor=string]       [endcolor=string]       [monitor=string]
       [where=string]   [psmap=string]   [group=string]   [--verbose]  [--quiet]

           Save thematic map commands to group file for GIS Manager

           Create graphic legend in x11 display monitor

           Only draw fills (no outlines) for areas and points

           Update color values to GRASSRGB column in attribute table

           Output legend for GIS Manager (for scripting use only)

           Use math notation brackets in legend

           Verbose module output

           Quiet module output

           Name of vector map

           Feature type
           Options: area,point,centroid,line,boundary
           Default: area

           Name of attribute column to use for thematic display (must be numeric)

           Type of thematic display
           Options: graduated_colors,graduated_points,graduated_lines
           Default: graduated_colors

           Thematic divisions of data for display
           Options: interval,std_deviation,quartiles,custom_breaks
           Default: interval

           Break points for custom breaks option
           Separate values by spaces (0 10 20 30 ...)

           Layer number
           Default: 1

           Vector point icon for point data
           Default: basic/circle

           Icon size for point data
           Minimum icon size/line width for graduated points/lines)
           Default: 5

           Maximum icon size/line width for graduated points and lines
           Default: 20

           Number of classes for interval theme (integer)
           Default: 4

           Color scheme for graduated color mapping
           Select 'single_color' for graduated point/line display
           Options:             blue-red,red-blue,green-red,red-green,blue-green,green-blue,cyan-
           Default: blue-red

           Color for graduated points map
           GRASS named color or R:G:B triplet. Set color scheme to single color
           Default: 255:0:0

           Color for graduated lines or point/area outlines
           GRASS named color or R:G:B triplet. Set color scheme to single color.
           Default: 0:0:0

           Beginning color for custom color gradient
           Must be expressed as R:G:B triplet
           Default: 255:0:0

           Ending color for custom color gradient
           Must be expressed as R:G:B triplet
           Default: 0:0:255

           Select x11 display monitor for legend
           Options: x0,x1,x2,x3,x4,x5,x6,none
           Default: x1

           WHERE conditions of SQL statement without 'where' keyword

           Root for the name of psmap instruction files to be in current directory
           If not set, no psmap instruction files will be created)

           Name of group file where thematic map commands will be saved


       d.vect.thematic   creates  thematic  maps from vectors of all types and numeric attributes
       (stored in the data table connected to a vector map). Thematic maps can  be  displayed  by
       either a graduated color scheme (for all vector types), as graduated icon sizes (for point
       and centroid types), or graduated line widths (for lines and  boundaries  with  associated
       attributes).  The user selects the vector map to be mapped and attribute column from which
       to derive mapping intervals, and (optionally) the layer for attribute data.

       In thematic maps, the color or point size changes for  each  range  of  attribute  values.
       Value  ranges  for  thematic  mapping  can be set at regular intervals, standard deviation
       units on either side of the mean, quartiles, or  delimited  by  user-defined  breakpoints.
       User-defined breakpoints also can  be entered, or piped into d.vect.thematic from standard
       input or other external source.

       There are options to define the color scheme (graduated colors) and range of  point  sizes
       (graduated  points)  for  thematic  maps.  A  simple text legend is printed. Optionally, a
       graphic legend can be drawn in the  selected  display  monitor.  Thematic  colors  can  be
       uploaded to a GRASSRGB column for later display,  and thematic map display commands can be
       saved to a group file (*.dm) that can be opened, edited, and displayed in the GIS Manager.

       When the psmap option is set to 'name', two psmap instruction files are  created  (in  the
       current  directory  if  no  path is given), one for the map ('name.psmap') and one for the
       legend ('name_legend.psmap'). The map file also contains 'label' commands which  allow  to
       create a legend directly in the map by adding a 'vlegend' command. See the man page
       for more details.


       The algorithm currently uses the to  calculate  basic  descriptive  statistics
       needed for thematic mapping (minimum, maximum, mean, standard deviation, and quartiles).


       Earthquake points with color gradient:
       d.vect.thematic -l recent_earthquakes column=magnitude type=point

       Earthquake points with different sizes:
       d.vect.thematic -l recent_earthquakes column=magnitude type=point \
                       themetype=graduated_points maxsize=15

       Spearfish: differences between 'elevation.10m' and 'elevation.dem':
       # random sampling of elevation points:
       g.region rast=elevation.10m -p
       v.random random n=200
       v.db.addtable random col="el10 double precision"
       # transfer elevations to attribute table of random points map:
       v.what.rast random rast=elevation.10m col=el10 random
       # comparative sampling of second map, incl. differences:
       v.sample in=random col=el10 rast=elevation.dem out=elev_sample elev_sample
       # thematic map:
       d.mon x0
       d.vect.thematic -l elev_sample column=diff type=point

       North Carolina data set example:
       g.region vect=nc_state
       d.vect.thematic -l precip_30ynormals column=annual type=point


        d.vect, d.vect.chart,


       Michael  Barton,  Arizona  State  University, Daniel Cavelo Aros, Martin Landa, and Jachym

       Last changed: $Date: 2008-08-15 08:16:42 +0200 (Fri, 15 Aug 2008)$

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