Package org.h2gis.functions.spatial.earth

Class ST_Isovist

java.lang.Object
org.h2gis.api.AbstractFunction
org.h2gis.api.DeterministicScalarFunction
org.h2gis.functions.spatial.earth.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

    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 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_Isovist

      public ST_Isovist()

  • Method Details

    • 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