Package org.h2gis.functions.spatial.earth

Class 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

      All Methods Static Methods Instance Methods Concrete Methods 
      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 interface org.h2gis.api.Function

        getProperty

    • Constructor Detail

      • ST_Svf

        public ST_Svf()

    • Method Detail

      • 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