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d.vect

NAME

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

KEYWORDS

display

SYNOPSIS

d.vect
d.vect help
d.vect [-vacix] map=name [type=string[,string,...]] [display=string[,string,...]] [attrcol=string] [icon=string] [size=integer] [layer=integer] [cats=range] [where=sql_query] [width=integer] [wcolumn=string] [wscale=float] [color=string] [fcolor=string] [rgb_column=string] [llayer=integer] [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 line ID

-x

Don't add to list of vectors and commands in monitor (it won't be drawn if the monitor is refreshed)

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

map=name

Name of input vector map

type=string[,string,...]

Type
Feature type(s)
Options: point,line,boundary,centroid,area,face
Default: point,line,boundary,centroid,area,face

display=string[,string,...]

Display
Options: shape,cat,topo,dir,attr,zcoor
Default: shape

attrcol=string

Name of column to be displayed

icon=string

Point and centroid symbol
Options: demo/smrk,demo/muchomurka,extra/4pt_star,extra/target,extra/offbox_sw,extra/half-circle,extra/airport,extra/pentagon,extra/adcp,extra/dive_flag,extra/offbox_ne,extra/alpha_flag,extra/offbox_se,extra/bridge,extra/n_arrow1,extra/fancy_compass,extra/compass,extra/offbox_nw,basic/cross1,basic/point,basic/octagon,basic/circle,basic/triangle,basic/star,basic/cross2,basic/arrow2,basic/x,basic/box,basic/diamond,basic/marker,basic/arrow1,basic/pushpin
Default: basic/x

size=integer

Symbol size
Default: 5

layer=integer

Layer number
Layer number. If -1, all layers are displayed.
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 = 10000

width=integer

Line width
Default: 0

wcolumn=string

Name of column for line widths (these values will be scaled by wscale)

wscale=float

Scale factor for wcolumn
Default: 1

color=string

Line color
Default: black

fcolor=string

Area fill color
Default: 200:200:200

rgb_column=string

Name of color definition column (for use with -a flag)
Default: GRASSRGB

llayer=integer

Layer for labels (default: the given layer number)

lcolor=string

Label color
Default: red

bgcolor=string

Label background color
Default: none

bcolor=string

Label border color
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., dqd.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

SEE ALSO

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

AUTHOR

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2007-04-25 22:34:17 +0200 (Wed, 25 Apr 2007) $

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