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v.to.3d.1grass

NAME

v.to.3d - Performs transformation of 2D vector features to 3D.

KEYWORDS

vector, transformation, 3D

SYNOPSIS

v.to.3d
v.to.3d help
v.to.3d [-rt] input=name output=name [type=string[,string,...]] [height=float] [layer=integer] [column=name] [--overwrite] [--verbose] [--quiet]

Flags:

-r

Reverse transformation; 3D vector features to 2D

-t

Do not copy table

--overwrite

Allow output files to overwrite existing files

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

input=name

Name of input vector map

output=name

Name for output vector map

type=string[,string,...]

Feature type
Options: point,line,boundary,centroid
Default: point,line,boundary,centroid

height=float

Fixed height for 3D vector features

layer=integer

Layer number
A single vector map can be connected to multiple database tables. This number determines which table to use.
Default: 1

column=name

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

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 (sab, 10 gen 2009) $

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