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NAME

d.vect - Displays vector data in the active frame on the graphics monitor.

KEYWORDS

display, vector

SYNOPSIS

d.vect
d.vect help
d.vect [-vacixz] map=name [display=string[,string,...]] [type=string[,string,...]] [layer=integer] [cats=range] [where=sql_query] [color=string] [fcolor=string] [rgb_column=name] [zcolor=style] [width=integer] [wcolumn=name] [wscale=float] [icon=string] [size=integer] [llayer=integer] [attrcol=name] [lcolor=string] [bgcolor=string] [bcolor=string] [lsize=integer] [font=string] [xref=string] [yref=string] [minreg=float] [maxreg=float] [render=string] [--verbose] [--quiet]

Flags:

-v
Run verbosely
-a
Get colors from map table column (of form RRR:GGG:BBB)
-c
Random colors according to category number (or layer number if 'layer=-1' is given)
-i
Use values from 'cats' option as feature id
-x
Don't add to list of vectors and commands in monitor (it won't be drawn if the monitor is refreshed)
-z
Colorize polygons according to z height
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

map=name
Name of input vector map
display=string[,string,...]
Display
Options: shape,cat,topo,dir,attr,zcoor
Default: shape
type=string[,string,...]
Feature type
Options: point,line,boundary,centroid,area,face
Default: point,line,boundary,centroid,area,face
layer=integer
Layer number (if -1, all layers are displayed)
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 1
cats=range
Category values
Example: 1,3,7-9,13
where=sql_query
WHERE conditions of SQL statement without 'where' keyword
Example: income < 1000 and inhab >= 10000
color=string
Line color
Either a standard GRASS color, R:G:B triplet, or "none"
Default: black
fcolor=string
Area fill color
Either a standard GRASS color, R:G:B triplet, or "none"
Default: 200:200:200
rgb_column=name
Name of color definition column (for use with -a flag)
Default: GRASSRGB
zcolor=style
Type of color table (for use with -z flag)
Default: terrain
width=integer
Line width
Default: 0
wcolumn=name
Name of column for line widths (these values will be scaled by wscale)
wscale=float
Scale factor for wcolumn
Default: 1
icon=string
Point and centroid symbol
Options: demo/smrk,demo/muchomurka,basic/x,basic/box,basic/star,basic/pushpin,basic/diamond,basic/triangle,basic/point,basic/arrow1,basic/arrow2,basic/circle,basic/cross1,basic/cross2,basic/marker,basic/octagon,extra/adcp,extra/compass,extra/fiducial,extra/4pt_star,extra/dive_flag,extra/half-box,extra/bridge,extra/offbox_ne,extra/offbox_nw,extra/offbox_se,extra/offbox_sw,extra/fancy_compass,extra/n_arrow1,extra/n_arrow2,extra/target,extra/airport,extra/alpha_flag,extra/pentagon,extra/half-circle,geology/strike_line,geology/strike_box,geology/strike_circle,geology/strike_triangle
Default: basic/x
size=integer
Symbol size
Default: 5
llayer=integer
Layer number
Layer number for labels (default: the given layer number)
Default: 1
attrcol=name
Name of column to be displayed
lcolor=string
Label color
Either a standard color name or R:G:B triplet
Default: red
bgcolor=string
Label background color
Either a standard GRASS color, R:G:B triplet, or "none"
Default: none
bcolor=string
Label border color
Either a standard GRASS color, R:G:B triplet, or "none"
Default: none
lsize=integer
Label size (pixels)
Default: 8
font=string
Font name
xref=string
Label horizontal justification
Options: left,center,right
Default: left
yref=string
Label vertical justification
Options: top,center,bottom
Default: center
minreg=float
Minimum region size (average from height and width) when map is displayed
maxreg=float
Maximum region size (average from height and width) when map is displayed
render=string
Rendering method for filled polygons
Options: g,r,d,c,l
Default: c
g: use the libgis render functions (features: clipping)
r: use the raster graphics library functions (features: polylines)
d: use the display library basic functions (features: polylines)
c: use the display library clipping functions (features: clipping)
l: use the display library culling functions (features: culling, polylines)

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.

By default d.vect fills in holes in polygons (islands). If you only want to show active areas limit the features with, e.g., "d.vect cats=1-999999".

In order to display attributes in the map, display=attr must be specified in addition to the column name (attrcol parameter).

Colors may be specified in an attribute table column named 'GRASSRGB' (which is a varchar(11) column containing RRR:GGG:BBB values), see the flag -a.

A table for a vector 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, use v.db.addcol:

v.db.addcol testisola col="GRASSRGB varchar(11)"

To add/change a color, use v.db.update:

v.db.update testisola col=GRASSRGB val="123:45:237" where="cat=139"

A much simpler method of color coding is by using the -c flag which displays vector elements 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

Spearfish examples:
# display roads with category numbers:
d.vect roads display=shape,cat lcolor=green

# display randomly colorized soils map with attributes
d.vect -c soils disp=attr attrcol=label

# display randomly colorized selected vectors from soils map
d.vect -c soils where="label='VBF'" display=shape,attr attrcol=label

3D points, 3D lines and 3D polygons colorized according to z height:

g.region rast=elevation.10m
r.random elevation.10m n=5000 vector=random3d -d
d.mon x0
# display as black points
d.vect random3d
# display 3D points colorized according to z height
d.vect -z random3d zcol=gyr

# 3D contour lines
r.contour elevation.10m out=contour20m step=20
d.vect -z contour20m zcol=gyr

# generate 3D triangles
v.delaunay random3d out=random3d_del
# display 3D polygons colorized according to z height
d.vect -z random3d_del type=area zcol=gyr

SEE ALSO

d.erase, d.what.vect, d.rast, d.font.freetype, v.colors, v.db.addcol, v.db.update
GRASS SQL interface

AUTHORS

CERL
Radim Blazek, ITC-Irst, Trento, Italy
other GRASS developers

Last changed: $Date: 2008-12-07 04:52:45 +0100 (Sun, 07 Dec 2008) $


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