GRASS 6 Tutorial/Vector spatial analysis: Difference between revisions

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==Vector Spatial Analysis==
==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, [http://grass.osgeo.org/grass64/manuals/v.overlay.html <code>v.overaly</code>] For the purposes of these examples, the two datasets that we will use are <code>urbanarea</code> and <code>census_wake2000</code>. All examples are created using the vector datasets in the North Carolina database.  
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, [http://grass.osgeo.org/grass64/manuals/v.overlay.html <code>v.overlay</code>] For the purposes of these examples, the two datasets that we will use are <code>urbanarea</code> and <code>census_wake2000</code>. All examples are created using the vector datasets in the North Carolina database.  


  d.mon start=x0
  d.mon start=x0
  d.vect urbanarea col=blue
g.region vect=census_wake2000
  d.vect census_wake2000 col=red type=boundary
  d.vect census_wake2000 col=blue
  d.vect urbanarea col=red type=boundary


===Vector Union===
===Vector Union===
The following command creates a union (operator <code>or</code>) of the two polygon vectors:
v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or
with urban_census2000 created as follows.
===Vector Intersection===
The following command creates an intersection (operator <code>and</code>) 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 (operator <code>not</code>) of the two polygon vectors:
v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not

Revision as of 14:23, 26 July 2013

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 For the purposes of these examples, the two datasets that we will use are urbanarea and census_wake2000. All examples are created using the vector datasets in 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 (operator or) of the two polygon vectors: 

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or

with urban_census2000 created as follows.

Vector Intersection

The following command creates an intersection (operator and) 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 (operator not) of the two polygon vectors: 

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not
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