DESCRIPTION

d.vect displays GRASS vector data in the active frame on the graphics monitor.

NOTES

d.vect can simply be used typing d.vect map=vector_map. There are a large variety of optional parameters which allow the user to specify vector type, colors, data fields, SQL queries, label size and justification, etc.

Vector area fill-colors may be specified in an attribute table column named 'GRASSRGB' (which is a varchar column containing RRR:GGG:BBB values). The -a flag is then used to fill areas based upon the color value associated with each category number.

A table for a vector area map might look like this: 

  echo "select * from testisola" | db.select
  cat|label|GRASSRGB
  0|no data|255:255:255
  90|FRASSILONGO|23:245:67
  104|LEVICO|23:145:67
  139|PERGINE VALSUGANA|223:45:237
  168|SANT'ORSOLA|223:45:67
  190|TENNA|123:45:67

To add the GRASSRGB color column, the SQL alter function is used: 

  echo "ALTER TABLE testisola ADD COLUMN GRASSRGB varchar(11)" | db.execute

To add/change a color, the SQL update function is used: 

  echo "update testisola set GRASSRGB='123:45:237' where cat=139" | db.execute

A much simpler method of color coding is by using the -c flag which fills areas of like category number with a random color.

This module can use FreeType/TrueType fonts if they have already been selected with d.font.freetype.

EXAMPLES

d.vect map=vectmap display=shape,cat lcolor=green
d.vect map=markveggy.vegtype where="VEGTYPE = 'IFA'"
d.vect -c map=soils display=shape,attr attrcol=label

SEE ALSO

d.erase, d.what.vect, d.rast, d.font.freetype
GRASS SQL interface

AUTHOR

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date$