v.build(1grass) GRASS GIS User's Manual v.build(1grass)
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 topol-
ogy
--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 for-
mats 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 (op-
tion=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:
• isolated bondaries (which are not forming any areas),
• centroids outside of area,
• duplicated centroids.
Extensive checks for topological errors (flag -e) also includes:
• lines or boundaries of zero length,
• intersecting boundaries, ie. overlapping areas,
• areas without centroids that are not isles.
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 in-
dex 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 topol-
ogy 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
SOURCE CODE
Available at: v.build source code (history)
Accessed: unknown
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GRASS 7.8.7 v.build(1grass)
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