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7/27/2019 Vector Spatial Analysis - GRASS-Wiki
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GRASS 6 Tutorial/Vector spatial analysis
From GRASS-Wiki
< GRASS 6 Tutorial
Contents
1 Vector Spatial Analysis
1.1 Vector Union
1.2 Vector Intersection
1.3 Vector Clip
2 Vector Analysis using the GUI
Vector Spatial Analysis
The following examples demonstrate how basic vector data processing operations, such as overlay, union
and clipping can be performed in GRASS 6.4. These operations are all performed using the GRASS module,
v.overlay (http://grass.osgeo.org/grass64/manuals/v.overlay.html) , which can either be run using the GUI
or from the command-line interface. The following examples are demonstrated using the CLI, using two
vector datasets, namely: urbanarea and census_wake2000 from the North Carolina database.
d.mon start=x0
g.region vect=census_wake2000
d.vect census_wake2000 col=blue
d.vect urbanarea col=red type=boundary
Vector Union
The following command creates a union (operatoror) of the two polygon vectors:
v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or
with urban_census2000 created as follows.
ASS 6 Tutorial/Vector spatial analysis - GRASS-Wiki http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_ana...
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Vector Intersection
The following command creates an intersection (operatorand) of the two polygon vectors:
v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=and
Vector Clip
The following command clips (cuts out) intersection (operatornot) of the two polygon vectors:
v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not
ASS 6 Tutorial/Vector spatial analysis - GRASS-Wiki http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_ana...
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Vector Analysis using the GUI
The above examples can be easily replicated using the v.overlay GUI, available underVector --> Overlay
Vector Maps --> Overlay Vector Maps [v.overlay]. The default tab allows you to select the two vector files
(ainput and binput):
The second tab ('Optional') allows you to specify the vector operator (or, and, not, ...) as well as other
options:
Once you have made your selections, simply clickRun
Retrieved from "http://grasswiki.osgeo.org/grass-wiki/index.php?title=GRASS_6_Tutorial
/Vector_spatial_analysis&oldid=19462"
This page was last modified on 29 July 2013, at 02:57.
This page has been accessed 42 times.
ASS 6 Tutorial/Vector spatial analysis - GRASS-Wiki http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_ana...
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Content is available under GNU Free Documentation License 1.2.
ASS 6 Tutorial/Vector spatial analysis - GRASS-Wiki http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_ana...
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