d.vect.thematic

## NAME

d.vect.thematic - Displays thematic vectormap

## KEYWORDS

display, legend

## SYNOPSIS

d.vect.thematic
d.vect.thematic help
d.vect.thematic [-fulsmg] 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] [group=string] [where=string] [psmap=string]

### Flags:

-f
  Only draw fills (no outlines) for areas and points
-u
  Update color values to GRASSRGB column in attribute table
-l
  Create graphic legend in x11 display monitor
-s
  Use with GIS Manager (special legend and display output)
-m
  Use math notation brackets in legend
-g
  Save thematic map commands to group file for GIS Manager

### Parameters:

map=string
  Vector map to display thematically
type=string
  Vector map type
  Options: area,point,centroid,line,boundary
  Default: area
column=string
  Attribute column to use for thematic display (must be numeric)
themetype=string
  Type of thematic display
  Options: graduated_colors,graduated_points,graduated_lines
  Default: graduated_colors
themecalc=string
  Thematic divisions of data for display
  Options: interval,std_deviation,quartiles,custom_breaks
  Default: interval
breakpoints=string
  Break points for custom breaks option. Separate values by spaces. (0 10 20 30 ...)
layer=integer
  Layer to use for thematic display
  Default: 1
icon=string
  Vector point icon for point data
  Options: basic/box,basic/circle,basic/cross2,basic/diamond,basic/star,basic/cross1,basic/x
  Default: basic/circle
size=float
  Icon size for point data (minimum icon size/line width for graduated points/lines)
  Default: 5
maxsize=float
  Maximum icon size/line width for graduated points and lines
  Default: 20
nint=integer
  Number of classes for interval theme (integer)
  Default: 4
colorscheme=string
  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-yellow,yellow-cyan,custom_gradient,single_color
  Default: blue-red
pointcolor=string
  Color for graduated points map (grass named color or R:G:B triplet). Set color scheme to single color.
  Default: 255:0:0
linecolor=string
  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
startcolor=string
  Beginning color for custom color gradient. Must be expressed as R:G:B triplet.
  Default: 255:0:0
endcolor=string
  Ending color for custom color gradient. Must be expressed as R:G:B triplet
  Default: 0:0:255
monitor=string
  Select x11 display monitor for legend
  Options: x0,x1,x2,x3,x4,x5,x6,none
  Default: x1
group=string
  Name of group file where thematic map commands will be saved
where=string
  WHERE conditions of SQL statement without 'where' keyword
psmap=string
  Root for the name of psmap instruction files to be in current directory (if not set, no psmap instruction files will be created)

## DESCRIPTION

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 ps.map man page for more details.

(GRASS Shell Script)

## ATTENTION

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

## EXAMPLES

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

## SEE ALSO

d.vect, d.vect.chart, v.univar.sh

## AUTHORS

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

Last changed: $Date: 2007/06/02 20:47:26 $

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