v.to.3d(1)

NAME
v.to.3d

DESCRIPTION
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.

NOTES
When transforming 2D vector features to 3D based on attribute, all NULL values are silently converted to height 0.0.

EXAMPLES

  Transform 2D vector features to 3D
# convert z-values from string to double
v.db.addcol 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_
# 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

AUTHORS
Martin Landa, CTU in Prague, Czech Republic

Last changed: $Date: 2009-01-10 00:39:21 +0100 (Sat, 10 Jan 2009) $

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