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NAME

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

KEYWORDS

       vector, geometry, 3D

SYNOPSIS

       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]

   Flags:
       -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

   Parameters:
       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

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. Height of input 3D features can be optionally stored in column.

NOTES

       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).

EXAMPLES

   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

AUTHOR

       Martin Landa, Czech Technical University in Prague, Czech Republic

       Last changed: $Date: 2015-06-17 04:29:17 +0200 (Wed, 17 Jun 2015) $

SOURCE CODE

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

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual