NAME

KEYWORDS

SYNOPSIS

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

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

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

EXAMPLES

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

AUTHORS

Last changed: $Date: 2007-06-02 13:46:58 -0700 (Sat, 02 Jun 2007) $

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