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d.vect.thematic.1grass

NAME

d.vect.thematic - Displays thematic vector map

KEYWORDS

display, vector, thematic, legend

SYNOPSIS

d.vect.thematic
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]

Flags:

-g

Save thematic map commands to group file for GIS Manager

-l

Create graphic legend in x11 display monitor

-f

Only draw fills (no outlines) for areas and points

-u

Update color values to GRASSRGB column in attribute table

-s

Output legend for GIS Manager (for scripting use only)

-m

Use math notation brackets in legend

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

map=string

Name of vector map

type=string

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

column=string

Name of 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 number
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

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)

group=string

Name of group file where thematic map commands will be saved

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

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=elev
v.db.select random

# comparative sampling of second map, incl. differences:
v.sample in=random col=el10 rast=elevation.dem out=elev_sample
v.db.select elev_sample

# thematic map:
d.mon x0
d.vect.thematic -l elev_sample column=diff type=point

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 22:46:58 +0200 (sab, 02 giu 2007) $

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