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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=integer] column=name 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] [overlap=name] [--verbose] [--quiet]

Parameters:

map=name
Name of input vector map
type=string[,string,...]
Feature type
Options: point,line,area
Default: point,line,area
layer=integer
Layer number
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 1
column=name
Name of attribute column to be used for labels
labels=name
Name for new paint-label file
font=string
Name of TrueType font (as listed in the fontcap)
size=float
Label size (in map-units)
Default: 100
isize=float
Icon size of point features (in map-units)
Default: 10
charset=string
Character encoding (default: UTF-8)
Default: UTF-8
color=string
Text color
Options: aqua,black,blue,brown,cyan,gray,green,grey,indigo,magenta,orange,purple,red,violet,white,yellow
Default: black
hcolor=string
Highlight color for text
Options: none,aqua,black,blue,brown,cyan,gray,green,grey,indigo,magenta,orange,purple,red,violet,white,yellow
Default: none
hwidth=float
Width of highlight coloring
Default: 0
background=string
Background color
Options: none,aqua,black,blue,brown,cyan,gray,green,grey,indigo,magenta,orange,purple,red,violet,white,yellow
Default: none
opaque=yes|no
Opaque to vector (only relevant if background color is selected)
Options: yes,no
Default: yes
border=string
Border color
Options: none,aqua,black,blue,brown,cyan,gray,green,grey,indigo,magenta,orange,purple,red,violet,white,yellow
Default: none
width=float
Border width (only for ps.map output)
Default: 0
overlap=name
Numeric column to give precedence in case of overlapping labels. The label with a smaller weight is hidden.
Default:

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 rast=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
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

Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $


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