org.h2gis.h2spatialext.function.spatial.properties
Class ST_CompactnessRatio

java.lang.Object
  org.h2gis.h2spatialapi.AbstractFunction
      org.h2gis.h2spatialapi.DeterministicScalarFunction
          org.h2gis.h2spatialext.function.spatial.properties.ST_CompactnessRatio

All Implemented Interfaces:

Function, ScalarFunction

public class ST_CompactnessRatio
extends DeterministicScalarFunction

ST_CompactnessRatio computes the perimeter of a circle whose area is equal to the given polygon's area, and returns the ratio of this computed perimeter to the given polygon's perimeter.

Equivalent definition: ST_CompactnessRatio returns the square root of the polygon's area divided by the area of the circle with circumference equal to the polygon's perimeter.

Note: This uses the 2D perimeter/area of the polygon.

Author:

Adam Gouge

Field Summary

Fields inherited from interface org.h2gis.h2spatialapi.ScalarFunction

PROP_DETERMINISTIC, PROP_NOBUFFER

Fields inherited from interface org.h2gis.h2spatialapi.Function

PROP_NAME, PROP_REMARKS

Constructor Summary

ST_CompactnessRatio()

Method Summary

static Double	computeCompacity(com.vividsolutions.jts.geom.Geometry geom) Returns the compactness ratio of the given polygon
String	getJavaStaticMethod()

Methods inherited from class org.h2gis.h2spatialapi.AbstractFunction

addProperty, getProperty, removeProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2gis.h2spatialapi.Function

getProperty

Constructor Detail

ST_CompactnessRatio

public ST_CompactnessRatio()

Method Detail

getJavaStaticMethod

public String getJavaStaticMethod()

computeCompacity

public static Double computeCompacity(com.vividsolutions.jts.geom.Geometry geom)

Returns the compactness ratio of the given polygon

Parameters:

geom - Geometry

Returns:

The compactness ratio of the given polygon