GRASS GIS manual: d.vect

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.4, available here.
Updated manual page: here

NAME

d.vect - Displays user-specified vector map in the active graphics frame.

KEYWORDS

display, graphics, vector

SYNOPSIS

d.vect

d.vect --help

d.vect [-cir] map=name [layer=string] display=string[,string,...] [type=string[,string,...]] [cats=range] [where=sql_query] [color=name] [fill_color=name] [rgb_column=name] [zcolor=style] [width=integer] [width_column=name] [width_scale=float] [icon=string] [size=float] [size_column=name] [rotation_column=name] [label_layer=string] [attribute_column=name] [label_color=name] [label_bgcolor=name] [label_bcolor=name] [label_size=integer] [font=string] [encoding=string] [xref=string] [yref=string] [minreg=float] [maxreg=float] [--help] [--verbose] [--quiet] [--ui]

Flags:

-c: Random colors according to category number (or layer number if 'layer=-1' is given)
-i: Use values from 'cats' option as feature id
-r: Use square root of the value of size_column; This makes circle areas proportionate to the size_column values instead of circle radius
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Name of vector map; Or data source for direct OGR access
layer=string: Layer number or name ('-1' for all layers); A single vector map can be connected to multiple database tables. This number determines which table to use. When used with direct OGR access this is the layer name.; Default: 1
display=string[,string,...] [required]: Display; Options: shape, cat, topo, vert, dir, zcoor; Default: shape; shape: Display geometry of features; cat: Display category numbers of features; topo: Display topology information (nodes, edges); vert: Display vertices of features; dir: Display direction of linear features; zcoor: Display z-coordinate of features (only for 3D vector maps)
type=string[,string,...]: Input feature type; Options: point, line, boundary, centroid, area, face; Default: point,line,boundary,area,face
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=name: Feature color; Either a standard color name, R:G:B triplet, or "none"; Default: black
fill_color=name: Area fill color; Either a standard color name, R:G:B triplet, or "none"; Default: 200:200:200
rgb_column=name: Colorize features according color definition column; Color definition in R:G:B form
zcolor=style: Colorize point or area features according to z-coordinate; Options: aspect, aspectcolr, bcyr, bgyr, blues, byg, byr, celsius, corine, curvature, differences, elevation, etopo2, evi, fahrenheit, gdd, greens, grey, grey.eq, grey.log, grey1.0, grey255, gyr, haxby, kelvin, ndvi, ndwi, oranges, population, population_dens, precipitation, precipitation_daily, precipitation_monthly, rainbow, ramp, random, reds, rstcurv, ryb, ryg, sepia, slope, srtm, srtm_plus, terrain, wave; aspect: aspect oriented grey colors; aspectcolr: aspect oriented rainbow colors; bcyr: blue through cyan through yellow to red; bgyr: blue through green through yellow to red; blues: white to blue; byg: blue through yellow to green; byr: blue through yellow to red; celsius: blue to red for degree Celsius temperature; corine: EU Corine land cover colors; curvature: for terrain curvatures (from v.surf.rst and r.slope.aspect); differences: differences oriented colors; elevation: maps relative ranges of raster values to elevation color ramp; etopo2: colors for ETOPO2 worldwide bathymetry/topography; evi: enhanced vegetative index colors; fahrenheit: blue to red for Fahrenheit temperature; gdd: accumulated growing degree days; greens: white to green; grey: grey scale; grey.eq: histogram-equalized grey scale; grey.log: histogram logarithmic transformed grey scale; grey1.0: grey scale for raster values between 0.0-1.0; grey255: grey scale for raster values between 0-255; gyr: green through yellow to red; haxby: relative colors for bathymetry or topography; kelvin: blue to red for temperature in Kelvin scale; ndvi: Normalized Difference Vegetation Index colors; ndwi: Normalized Difference Water Index colors; oranges: white to orange; population: color table covering human population classification breaks; population_dens: color table covering human population density classification breaks; precipitation: precipitation color table (0..2000mm); precipitation_daily: precipitation color table (0..1000mm); precipitation_monthly: precipitation color table (0..1000mm); rainbow: rainbow color table; ramp: color ramp; random: random color table; reds: white to red; rstcurv: terrain curvature (from r.resamp.rst); ryb: red through yellow to blue; ryg: red through yellow to green; sepia: yellowish-brown through to white; slope: r.slope.aspect-type slope colors for raster values 0-90; srtm: color palette for Shuttle Radar Topography Mission elevation; srtm_plus: color palette for Shuttle Radar Topography Mission elevation (with seafloor colors); terrain: global elevation color table covering -11000 to +8850m; wave: color wave
width=integer: Line width; Default: 0
width_column=name: Name of numeric column containing line width; These values will be scaled by width_scale
width_scale=float: Scale factor for width_column; Default: 1
icon=string: Point and centroid symbol; Options: basic/arrow1, basic/arrow2, basic/arrow3, basic/box, basic/circle, basic/cross1, basic/cross2, basic/cross3, basic/diamond, basic/marker, basic/octagon, basic/point, basic/pushpin, basic/star, basic/triangle, basic/x, demo/muchomurka, demo/smrk, extra/4pt_star, extra/adcp, extra/airport, extra/alpha_flag, extra/bridge, extra/dim_arrow, extra/dive_flag, extra/fiducial, extra/fish, extra/half-box, extra/half-circle, extra/offbox_ne, extra/offbox_nw, extra/offbox_se, extra/offbox_sw, extra/pentagon, extra/ping, extra/ring, extra/simple_zia, extra/target, geology/circle_cross, geology/half-arrow_left, geology/half-arrow_right, geology/strike_box, geology/strike_circle, geology/strike_cleavage, geology/strike_half-bowtie, geology/strike_line, geology/strike_parallel, geology/strike_triangle, n_arrows/basic_compass, n_arrows/fancy_compass, n_arrows/n_arrow1a, n_arrows/n_arrow1b, n_arrows/n_arrow2, n_arrows/n_arrow3, n_arrows/n_arrow4, n_arrows/n_arrow5, n_arrows/n_arrow6, n_arrows/n_arrow7a, n_arrows/n_arrow7b, n_arrows/n_arrow8a, n_arrows/n_arrow8b, n_arrows/n_arrow9; Default: basic/x
size=float: Symbol size; When used with the size_column option this becomes the scale factor; Default: 5
size_column=name: Name of numeric column containing symbol size
rotation_column=name: Name of numeric column containing symbol rotation angle; Measured in degrees CCW from east
label_layer=string: Layer number for labels (default: the given layer number); Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.; Default: 1
attribute_column=name: Name of column to be displayed as a label
label_color=name: Label color; Either a standard color name or R:G:B triplet; Default: red
label_bgcolor=name: Label background color; Either a standard color name, R:G:B triplet, or "none"; Default: none
label_bcolor=name: Label border color; Either a standard color name, R:G:B triplet, or "none"; Default: none
label_size=integer: Label size (pixels); Default: 8
font=string: Font name
encoding=string: Text encoding
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

DESCRIPTION
NOTES
EXAMPLES
SEE ALSO
AUTHORS

DESCRIPTION

d.vect displays vector maps 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 areas are filled with fill_color and outlined with color. Area outlines can be suppressed with

d.vect map=vector_map color=none

and areas can be made transparent with

d.vect map=vector_map fill_color=none

In order to display attributes in the map, attribute_column must be specified.

Feature colors may be specified by v.colors in a form of color table or in an attribute table column containing RRR:GGG:BBB values.

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.addcolumn:

v.db.addcolumn 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 label_color=green

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

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

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

g.region raster=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 map=random3d zcolor=gyr

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

# generate 3D triangles
v.delaunay input=random3d output=random3d_del
# display 3D polygons colorized according to z height
d.vect map=random3d_del type=area zcolor=gyr

AUTHORS

CERL
Radim Blazek, ITC-Irst, Trento, Italy
Support for color tables by Martin Landa, Czech Technical University in Prague (8/2011)
and many other GRASS developers

Last changed: $Date: 2014-12-19 13:55:37 -0800 (Fri, 19 Dec 2014) $

SOURCE CODE

Available at: d.vect source code (history)