Your company here — click to reach over 10,000 unique daily visitors

v.to.3d.1grass - Man Page

Performs transformation of 2D vector features to 3D.


vector, geometry, 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]



Reverse transformation; 3D vector features to 2D


Do not copy attribute table


Allow output files to overwrite existing files


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


input=name [required]

Name of input vector map
Or data source for direct OGR access


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


Input feature type
Options: point, line, boundary, centroid
Default: point,line,boundary,centroid

output=name [required]

Name for output vector map


Name of attribute column used for height
Can be used for reverse transformation, to store height of points


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).


Transform 2D vector features to 3D

# 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

Transform 3D vector features to 2D

v.to.3d -rt input=elev_lid792_bepts output=elev_lid_2d

See Also

v.transform, v.extrude, v.drape


Martin Landa, Czech Technical University in Prague, Czech Republic

Source Code

Available at: v.to.3d source code (history)

Accessed: Tuesday May 14 13:41:29 2024

Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual


GRASS 8.3.2 GRASS GIS User's Manual