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

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


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:


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


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 (Raleigh, North Carolina, USA, area)


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.
d.label d.labels ps.map Wikipedia article on simulated annealing
Wolf Bergenheim Last changed: $Date: 2009-09-02 23:22:20 +0200 (Wed, 02 Sep 2009) $ Full index (C) 2003-2010 GRASS Development Team V.LABEL.SA(1)

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