aRTlayer-getSetOperation {aRT}R Documentation

Set Operations

Description

Return the result of an operation involving sets (union, intersection, difference and xor). The result has "" as ID.

Usage

## S4 method for signature 'aRTlayer':
getSetOperation(object, operation= c("union", "intersection", "difference", "xor"), ID = NULL, as.sp = TRUE)

Arguments

object Object of class aRTlayer.
operation One of:
  • union
  • intersection
  • difference
  • xor (does not work yet)
ID The ids which to be used in the operation. difference and xor use only two ids. union and intersection have as default all objects of the layer.
as.sp Return Spatial data or an object of class aRTgeometry

Note

If one polygon has two consecultive and equal points, these algorithms may not work, therefore you need to remove this unwanted data before.

Author(s)

Pedro Ribeiro de Andrade

See Also

See aRTlayer-class to the description of this class.

Examples

## Not run: 
## difference between two geometries
getSetMetric(layer, "difference", ids=c("1", "2"))

## union of all geometries of the layer
getSetMetric(layer, "union")
## End(Not run)
[Package aRT version 1.7-1 Index]