Package org.h2gis.functions.spatial.earth

Class ST_Svf

java.lang.Object

org.h2gis.api.AbstractFunction

org.h2gis.api.DeterministicScalarFunction

org.h2gis.functions.spatial.earth.ST_Svf

All Implemented Interfaces:

org.h2gis.api.Function, org.h2gis.api.ScalarFunction

public class ST_Svf
extends org.h2gis.api.DeterministicScalarFunction

This function will be used to compute the Sky View Factor based on geometries

Author:

Erwan Bocher, CNRS, Jérémy Bernard, CNRS, Nicolas Fortin, IFSTTAR

Field Summary

Fields inherited from interface org.h2gis.api.Function

PROP_NAME, PROP_REMARKS

Fields inherited from interface org.h2gis.api.ScalarFunction

PROP_DETERMINISTIC

Constructor Summary

Constructors

Constructor	Description
ST_Svf()

Method Summary

Modifier and Type	Method	Description
static void	addSegments(org.locationtech.jts.geom.Coordinate[] coords, org.locationtech.jts.geom.GeometryFactory factory, org.locationtech.jts.index.strtree.STRtree strtree)	Tranform to segments and add then in a STRtree if they intersect a buffer geometry
static Double	computeSvf(org.locationtech.jts.geom.Point pt, org.locationtech.jts.geom.Geometry geoms, double distance, int rayCount)	The method to compute the Sky View Factor
static Double	computeSvf(org.locationtech.jts.geom.Point pt, org.locationtech.jts.geom.Geometry geoms, double distance, int rayCount, int stepRayLength)	The method to compute the Sky View Factor
String	getJavaStaticMethod()

Methods inherited from class org.h2gis.api.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.api.Function

getProperty

Constructor Details

ST_Svf

public ST_Svf()

Method Details

getJavaStaticMethod

public String getJavaStaticMethod()

computeSvf

public static Double computeSvf(org.locationtech.jts.geom.Point pt,
 org.locationtech.jts.geom.Geometry geoms,
 double distance,
 int rayCount)
                         throws SQLException

The method to compute the Sky View Factor

Parameters:

pt -

distance -

rayCount - number of rays

geoms -

Returns:

Throws:

SQLException

computeSvf

public static Double computeSvf(org.locationtech.jts.geom.Point pt,
 org.locationtech.jts.geom.Geometry geoms,
 double distance,
 int rayCount,
 int stepRayLength)
                         throws SQLException

The method to compute the Sky View Factor

Parameters:

pt -

distance -

rayCount - number of rays

stepRayLength - length of sub ray used to limit the number of geometries when requested

geoms -

Returns:

Throws:

SQLException

addSegments

public static void addSegments(org.locationtech.jts.geom.Coordinate[] coords,
 org.locationtech.jts.geom.GeometryFactory factory,
 org.locationtech.jts.index.strtree.STRtree strtree)

Tranform to segments and add then in a STRtree if they intersect a buffer geometry

Parameters:

coords - the coordinates of the input geometry

factory - the geometry factory

strtree - the STRtree to store the segments