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v.label.sa(1grass) GRASS GIS User's Manual v.label.sa(1grass)

NAME

v.label.sa - Create optimally placed labels for vector map(s)

KEYWORDS

vector, paint labels

SYNOPSIS

v.label.sa
v.label.sa --help
v.label.sa map=name [type=string[,string,...]] [layer=string] column=string labels=name font=string [size=float] [isize=float] [charset=string] [color=string] [hcolor=string] [hwidth=float] [background=string] [opaque=yes|no] [border=string] [width=float] [--help] [--verbose] [--quiet] [--ui]

Flags:


Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

Parameters:


Name of vector map
Or data source for direct OGR access

Input feature type
Options: point, line, area
Default: point,line,area

Layer number or name
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
Default: 1

Name of attribute column to be used for labels

Name for new paint-label file

Name of TrueType font (as listed in the fontcap)

Label size (in map-units)
Default: 100

Icon size of point features (in map-units)
Default: 10

Character encoding (default: UTF-8)
Default: UTF-8

Text color
Options: aqua, black, blue, brown, cyan, gray, green, grey, indigo, magenta, orange, purple, red, violet, white, yellow
Default: black

Highlight color for text
Options: none, aqua, black, blue, brown, cyan, gray, green, grey, indigo, magenta, orange, purple, red, violet, white, yellow
Default: none

Width of highlight coloring
Default: 0

Background color
Options: none, aqua, black, blue, brown, cyan, gray, green, grey, indigo, magenta, orange, purple, red, violet, white, yellow
Default: none

Opaque to vector (only relevant if background color is selected)
Options: yes, no
Default: yes

Border color
Options: none, aqua, black, blue, brown, cyan, gray, green, grey, indigo, magenta, orange, purple, red, violet, white, yellow
Default: none

Border width (only for ps.map output)
Default: 0

DESCRIPTION

v.label.sa makes a label-file from a GRASS vector map with labels created from attributes in the attached table. The labels are placed in as optimal place as possible. The label file has the same syntax as the one created by v.label

EXAMPLE

North Carolina example:

# get font names:
d.font -L
v.label.sa roadsmajor labels=roads_labels column=ROAD_NAME color=red \


           background=white size=250 font=Vera
# set region:
g.region raster=lsat7_2002_10 -p
# display:
d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
d.vect roadsmajor col=yellow
d.labels roads_labels

Road labeling with v.label.sa (Raleigh, North Carolina, USA, area)

REFERENCES

Edmondson, Christensen, Marks and Shieber: A General Cartographic Labeling Algorithm, Cartographica, Vol. 33, No. 4, Winter 1996, pp. 13-23 The algorithm works by the principle of Simulated Annealing.

SEE ALSO

d.label
d.labels
ps.map Wikipedia article on simulated annealing

AUTHOR

Wolf Bergenheim

SOURCE CODE

Available at: v.label.sa source code (history)

Accessed: Sat Jun 4 12:07:04 2022

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GRASS 8.2.0