d.vect(1grass)

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

KEYWORDS
display, graphics, vector, level1

SYNOPSIS
d.vect
d.vect --help
d.vect [-cirs] 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] [icon_area=string] [icon_line=string] [legend_label=string] [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

-s
    Do not show this layer in vector legend

--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,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 population >= 10000

color=name
    Feature color
    Either a standard color name, R:G:B triplet, or "none"
    Default: 0:29:57

fill_color=name
    Area fill color
    Either a standard color name, R:G:B triplet, or "none"
    Default: 0:103:204

rgb_column=name
    Colorize features according to 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, forest_cover, gdd, grass, greens, grey, grey.eq, grey.log, grey1.0, grey255, gyr, haxby, inferno, kelvin, magma, ndvi, ndwi, nlcd, oranges, plasma, population, population_dens, precipitation, precipitation_daily, precipitation_monthly, rainbow, ramp, random, reds, roygbiv, rstcurv, ryb, ryg, sepia, slope, soilmoisture, srtm, srtm_plus, terrain, viridis, water, wave
    aspect: aspect oriented grey colors [range: map values]
    aspectcolr: aspect oriented rainbow colors [range: 0 to 360]
    bcyr: blue through cyan through yellow to red [range: map values]
    bgyr: blue through green through yellow to red [range: map values]
    blues: white to blue [range: map values]
    byg: blue through yellow to green [range: map values]
    byr: blue through yellow to red [range: map values]
    celsius: blue to red for degree Celsius temperature [range: -80 to 80]
    corine: EU Corine land cover colors [range: 111 to 995]
    curvature: for terrain curvatures (from v.surf.rst and r.slope.aspect) [range: map values]
    differences: differences oriented colors [range: map values]
    elevation: maps relative ranges of raster values to elevation color ramp [range: map values]
    etopo2: colors for ETOPO2 worldwide bathymetry/topography [range: -11000 to 8850]
    evi: enhanced vegetative index colors [range: -1 to 1]
    fahrenheit: blue to red for Fahrenheit temperature [range: -112 to 176]
    forest_cover: percentage of forest cover [range: 0 to 100]
    gdd: accumulated growing degree days [range: 0 to 6000]
    grass: GRASS GIS green (perceptually uniform) [range: map values]
    greens: white to green [range: map values]
    grey: grey scale [range: map values]
    grey.eq: histogram-equalized grey scale [range: map values]
    grey.log: histogram logarithmic transformed grey scale [range: map values]
    grey1.0: grey scale for raster values between 0.0-1.0 [range: 0 to 1]
    grey255: grey scale for raster values between 0-255 [range: 0 to 255]
    gyr: green through yellow to red [range: map values]
    haxby: relative colors for bathymetry or topography [range: map values]
    inferno: perceptually uniform sequential color table inferno [range: map values]
    kelvin: blue to red for temperature in Kelvin scale [range: 193.15 to 353.15]
    magma: perceptually uniform sequential color table magma [range: map values]
    ndvi: Normalized Difference Vegetation Index colors [range: -1 to 1]
    ndwi: Normalized Difference Water Index colors [range: -200 to 200]
    nlcd: US National Land Cover Dataset colors [range: 0 to 95]
    oranges: white to orange [range: map values]
    plasma: perceptually uniform sequential color table plasma [range: map values]
    population: color table covering human population classification breaks [range: 0 to 2e+09]
    population_dens: color table covering human population density classification breaks [range: 0 to 1e+09]
    precipitation: precipitation color table (0..2000mm) [range: 0 to 7000]
    precipitation_daily: precipitation color table (0..1000mm) [range: 0 to 10000]
    precipitation_monthly: precipitation color table (0..1000mm) [range: 0 to 1000]
    rainbow: rainbow color table [range: map values]
    ramp: color ramp [range: map values]
    random: random color table [range: map values]
    reds: white to red [range: map values]
    roygbiv: [range: map values]
    rstcurv: terrain curvature (from r.resamp.rst) [range: map values]
    ryb: red through yellow to blue [range: map values]
    ryg: red through yellow to green [range: map values]
    sepia: yellowish-brown through to white [range: map values]
    slope: r.slope.aspect-type slope colors for raster values 0-90 [range: 0 to 90]
    soilmoisture: soilmoisture color table (0.0-1.0) [range: 0 to 1]
    srtm: color palette for Shuttle Radar Topography Mission elevation [range: -11000 to 8850]
    srtm_plus: color palette for Shuttle Radar Topography Mission elevation (with seafloor colors) [range: -11000 to 8850]
    terrain: global elevation color table covering -11000 to +8850m [range: -11000 to 8850]
    viridis: perceptually uniform sequential color table viridis [range: map values]
    water: water depth [range: map values]
    wave: color wave [range: map values]

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/arrow, basic/arrow1, basic/arrow2, basic/arrow3, basic/box, basic/circle, basic/cross1, basic/cross2, basic/cross3, basic/diamond, basic/hexagon, basic/marker, basic/octagon, basic/pin, basic/pin_dot, 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, legend/area, legend/area_curved, legend/line, legend/line_crooked, 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

icon_area=string
    Area/boundary symbol for legend
    Options: basic/arrow, basic/arrow1, basic/arrow2, basic/arrow3, basic/box, basic/circle, basic/cross1, basic/cross2, basic/cross3, basic/diamond, basic/hexagon, basic/marker, basic/octagon, basic/pin, basic/pin_dot, 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, legend/area, legend/area_curved, legend/line, legend/line_crooked, 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: legend/area

icon_line=string
    Line symbol for legend
    Options: basic/arrow, basic/arrow1, basic/arrow2, basic/arrow3, basic/box, basic/circle, basic/cross1, basic/cross2, basic/cross3, basic/diamond, basic/hexagon, basic/marker, basic/octagon, basic/pin, basic/pin_dot, 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, legend/area, legend/area_curved, legend/line, legend/line_crooked, 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: legend/line

legend_label=string
    Label to display after symbol in vector legend

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.

When d.vect is used with where parameter on MS Windows Command Prompt, it is important to use ˆ carret symbol for escaping special characters < > ( ) & | , ; ".

d.vect map=vector_map where="cat ˆ> 10 AND cat ˆ< 20"

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 (for 3D lines and polygons a z height is computed by a midpoint of line/area bounding box):

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

SEE ALSO
v.colors, d.erase, d.rast, v.colors, v.db.addcolumn, v.db.update

GRASS SQL interface

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

SOURCE CODE

Available at: d.vect source code (history)

Accessed: Monday Apr 01 03:07:17 2024

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