Package org.h2gis.functions.spatial.earth

Class ST_Isovist

  • All Implemented Interfaces:
    org.h2gis.api.Function, org.h2gis.api.ScalarFunction
    public class ST_Isovist
extends org.h2gis.api.DeterministicScalarFunction
    ST_Isovist ST_Isovist takes LINESTRING(S) or POLYGON(S) as input and a maximum distance (spatial ref units). This function compute the visibility polygon obstructed by provided "walls". Provided segments will be enclosed by a circle defined by maximum distance parameter.
    Author:
    Nicolas Fortin, Ifsttar UMRAE

    • 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_Isovist()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      String getJavaStaticMethod()  
      static org.locationtech.jts.geom.Geometry isovist​(org.locationtech.jts.geom.Geometry viewPoint, org.locationtech.jts.geom.Geometry lineSegments, double maxDistance)
      This function compute the visibility polygon
      static org.locationtech.jts.geom.Geometry isovist​(org.locationtech.jts.geom.Geometry viewPoint, org.locationtech.jts.geom.Geometry lineSegments, double maxDistance, double radBegin, double radSize)
      This function compute the visibility polygon

      • Methods inherited from class org.h2gis.api.AbstractFunction

        addProperty, getProperty, removeProperty

      • Methods inherited from interface org.h2gis.api.Function

        getProperty

    • Constructor Detail

      • ST_Isovist

        public ST_Isovist()

    • Method Detail

      • getJavaStaticMethod

        public String getJavaStaticMethod()

      • isovist

        public static org.locationtech.jts.geom.Geometry isovist​(org.locationtech.jts.geom.Geometry viewPoint,
                                                         org.locationtech.jts.geom.Geometry lineSegments,
                                                         double maxDistance)
                                                  throws SQLException
        This function compute the visibility polygon
        Parameters:
        viewPoint - Point instance, isovist location
        lineSegments - Occlusion segments. Geometry collection or polygon or linestring
        maxDistance - Maximum distance of view from viewPoint (spatial ref units)
        Returns:
        The visibility polygon
        Throws:
        SQLException - In case of wrong parameters

      • isovist

        public static org.locationtech.jts.geom.Geometry isovist​(org.locationtech.jts.geom.Geometry viewPoint,
                                                         org.locationtech.jts.geom.Geometry lineSegments,
                                                         double maxDistance,
                                                         double radBegin,
                                                         double radSize)
                                                  throws SQLException
        This function compute the visibility polygon
        Parameters:
        viewPoint - Point instance, isovist location
        lineSegments - Occlusion segments. Geometry collection or polygon or linestring
        maxDistance - Maximum distance of view from viewPoint (spatial ref units)
        radBegin - Constraint view angle start in radian
        radSize - Constraint view angle size in radian
        Returns:
        The visibility polygon
        Throws:
        SQLException - In case of wrong parameters