d.vectgrass - Online in the Cloud

PROGRAM:

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

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

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