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v.to.3d(1) Grass User's Manual v.to.3d(1)

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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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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