v.clip.1grass - Man Page

Extracts features of input map which overlay features of clip map.

Keywords

vector, clip, area

Synopsis

v.clip
v.clip --help
v.clip [-dr] input=name clip=name output=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

Flags

-d

Do not dissolve clip map

-r

Clip by region

--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 vector map to be clipped
Or data source for direct OGR access

clip=name [required]

Name of clip vector map
Or data source for direct OGR access

output=name [required]

Name for output vector map

Description

v.clip module enables extracting those features of input vector map, which overlay features of clip map, as well as their storing in a new vector map.

In default, boundaries of clip map are dissolved before clipping. Alternatively, flag -d can be ticked to retain the boundaries of clip map. Flag -b facilitates clipping by current computational region.

It is possible to clip vector maps consisting of points, lines, areas or combinations of these. However, the current version does not fully support clipping of mixed geometry containing points. In such a case, the output map will only store clipped lines and/or areas.

Notes

v.clip is a front-end to v.overlay, as well as v.select. Clipping of areas and/or lines can be achieved using v.overlay. Clipping of points can be performed with v.select.

Examples

Basic use

Clip railroads by counties Wake and Johnston in North Carolina (North Carolina data set).

v.extract input=boundary_county where="NAME=’WAKE’ OR NAME=’JOHNSTON’" output=county_WAKE_JOHNSTON
v.clip input=railroads clip=county_WAKE_JOHNSTON output=railroads_WAKE_JOHNSTON

Figure: v.clip example - basic use

Retain boundaries of clip map

v.clip -d input=railroads clip=county_WAKE_JOHNSTON output=railroads_WAKE_JOHNSTON

Clip by current computational region

Clip hospitals by computational region adjusted to counties Wake and Johnston in North Carolina (North Carolina data set). It is not obligatory to enter name of clip map. In case it is stated, the clip map will be omitted.

v.extract input=boundary_county where="NAME=’WAKE’ OR NAME=’JOHNSTON’" output=county_WAKE_JOHNSTON
v.clip -r input=hospitals output=hospitals_clip

Figure: v.clip example - clip by computational region

See Also

v.overlay, v.select, v.dissolve, v.in.region

Author

Zofie Cimburova, GeoForAll Lab, Czech Technical University in Prague, Czech Republic

Source Code

Available at: v.clip source code (history)

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