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:
       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       map=name [required]
           Name of vector map
           Or data source for direct OGR access

       type=string[,string,...]
           Input feature type
           Options: point, line, area
           Default: point,line,area

       layer=string
           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

       column=string [required]
           Name of attribute column to be used for labels

       labels=name [required]
           Name for new paint-label file

       font=string [required]
           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

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)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual