Linux Certif

Toute la documentation sur la certification Linux LPI

d.vect.1grass

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 = 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/muchomurka,demo/smrk,basic/arrow1,basic/arrow2,basic/box,basic/circle,basic/cross1,basic/cross2,basic/diamond,basic/marker,basic/octagon,basic/point,basic/pushpin,basic/star,basic/triangle,basic/x,extra/4pt_star,extra/adcp,extra/airport,extra/alpha_flag,extra/bridge,extra/compass,extra/dive_flag,extra/fancy_compass,extra/fiducial,extra/fish,extra/half-box,extra/half-circle,extra/n_arrow1,extra/n_arrow2,extra/offbox_ne,extra/offbox_nw,extra/offbox_se,extra/offbox_sw,extra/pentagon,extra/ping,extra/ring,extra/target,geology/strike_box,geology/strike_circle,geology/strike_line,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 map=vector_map 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:
db.select sql="select * from testisola"
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 map=testisola columns="GRASSRGB varchar(11)"

To add/change a color, use v.db.update:
v.db.update map=testisola column=GRASSRGB value="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.

Parameter width is set by default to '0'. XDRIVER specifies the precise behaviour for non-zero line width, but drivers have some freedom as to how zero-width lines are handled, so they can use the hardware's "thin line" drawing primitive, if it has one. A width of zero can potentially result in significantly faster operation. On drivers where there is no such thing as a "thin" line, the driver will use a sensible default (which might not be the same as '1').

EXAMPLES

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

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

# display randomly colorized selected vectors from soils map
d.vect -c map=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 input=elevation.10m n=5000 vector=random3d -d
d.mon start=x0
# display as black points
d.vect map=random3d
# display 3D points colorized according to z height
d.vect -z map=random3d zcolor=gyr

# 3D contour lines
r.contour input=elevation.10m output=contour20m step=20
d.vect -z map=contour20m zcolor=gyr

# generate 3D triangles
v.delaunay input=random3d output=random3d_del
# display 3D polygons colorized according to z height
d.vect -z map=random3d_del type=area zcolor=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: 2010-02-24 12:35:55 +0100 (mer, 24 feb 2010) $

Full index

© 2003-2010 GRASS Development Team