NAME

v.build - Creates topology for vector map. Optionally also checks for topological errors.

KEYWORDS

vector, topology, geometry

SYNOPSIS

v.build v.build --help v.build [-e] map=name [error=name] option= string[,string,...] [--overwrite] [--help] [-- verbose] [--quiet] [--ui]

Flags:

-e

 

Extensive checks for topological errors

 

Perform in-depth checks for topological errors when building topology

--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:

map=name [required]

 

Name of vector map

error=name

 

Name for output vector map where erroneous vector features are written to

option=string[,string,...] [required]

 

Build topology or dump topology or indices to standard output

 

Options: build, dump, sdump, cdump, fdump

 

Default: build

 

build: build topology

 

dump: write topology to stdout

 

sdump: write spatial index to stdout

 

cdump: write category index to stdout

 

fdump: write feature index to stdout (OGR simple-feature-based formats only)

DESCRIPTION

v.build builds support files for GRASS vector maps. These support files supply topology and category information including spatial index that are needed by other GRASS modules. GRASS is generating these support files automatically, only in rare cases the user has to (re)build them. Refer to vector data processing in GRASS GIS for more information on GRASS vector data model.

NOTES

v.build creates support files only for vector maps located in the user’s current mapset. It’s not possible to rebuild support files ( option=build) for vector maps from other mapsets. In case of errors, the user can optionally generate an error vector map containing the erroneous vectors for later inspection. If error vector map is specified, v.build checks: Extensive checks for topological errors (flag -e) also includes:

EXAMPLES

Build topology

Note that option=build recreates also spatial and category indices, not only topology. For linked OGR layers (see v.external) also feature index is created.

v.build map=urbanarea option=build

Note that the vector map urbanarea must be located in the current mapset.

Dump topology or indices

Dump options print topology, spatial, category or feature index to standard output. Such information can be printed also for vector maps from other mapsets. A description of the vector topology is available in the GRASS GIS 7 Programmer’s Manual, section "Vector library topology management".

v.build map=urbanarea option=dump

SEE ALSO

v.build.all, v.build.polylines, v.edit, v.split See also wxGUI vector digitizer.

AUTHORS

Dave Gerdes, U.S.Army Construction Engineering Research Laboratory, Michael Higgins, U.S.Army Construction Engineering Research Laboratory, Radim Blazek, ITC-irst, Trento, Italy Last changed: $Date: 2016-03-08 09:06:33 +0100 (Tue, 08 Mar 2016) $

SOURCE CODE

Available at: v.build source code (history) Main index | Vector index | Topics index | Keywords index | Graphical index | Full index © 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual