v.to.3d - Performs transformation of 2D vector features to 3D.
vector, geometry, 3D
v.to.3d
v.to.3d --help
v.to.3d [-
rt]
input=
name
[
layer=
string] [
type=
string[,
string,...]]
output=
name [
column=
name]
[
height=
float] [--
overwrite] [--
help]
[--
verbose] [--
quiet] [--
ui]
- -r
-
Reverse transformation; 3D vector features to 2D
- -t
-
Do not copy attribute table
- --overwrite
-
Allow output files to overwrite existing files
- --help
-
Print usage summary
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
- --ui
-
Force launching GUI dialog
- input=name [required]
-
Name of input 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
- type=string[,string,...]
-
Input feature type
Options: point, line, boundary, centroid
Default: point,line,boundary,centroid
- output=name [required]
-
Name for output vector map
- column=name
-
Name of attribute column used for height
Can be used for reverse transformation, to store height of points
- height=float
-
Fixed height for 3D vector features
The
v.to.3d module is used to transform 2D vector features to 3D. Height
(z-coordinate) of 3D vector features can be specified by
height
parameter as fixed value or by
column parameter.
Flag
-r enables to perform reverse transformation, i.e., transform 3D
vector to 2D by omitting z-coordinate. Height of input 3D features can be
optionally stored in
column.
When transforming 2D vector features to 3D based on attribute, all NULL values
are silently converted to height 0.0.
Reverse transformation is possible for points and lines. In case of lines, the
reverse transformation should be used only when all vertices of a line have
the same z-coordinate (for example contours).
# convert z-values from string to double
v.db.addcolumn map=geodetic_pts columns="Z_VALUE_D double precision"
v.db.update map=geodetic_pts column=Z_VALUE_D qcolumn=Z_VALUE
v.db.select map=geodetic_pts columns=cat,Z_VALUE,Z_VALUE_D
# convert 2D vector point map to 3D based on attribute
v.to.3d input=geodetic_pts out=geodetic_pts_3d column=Z_VALUE_D
v.to.3d -rt input=elev_lid792_bepts output=elev_lid_2d
v.transform, v.extrude, v.drape
Martin Landa, Czech Technical University in Prague, Czech Republic
Last changed: $Date: 2015-06-17 04:29:17 +0200 (Wed, 17 Jun 2015) $
Available at: v.to.3d source code (history)
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