Package org.h2gis.functions.io.geojson

Class ST_AsGeoJSON

  • All Implemented Interfaces:
    org.h2gis.api.Function, org.h2gis.api.ScalarFunction
    public class ST_AsGeoJSON
extends org.h2gis.api.DeterministicScalarFunction
    Transform a JTS geometry to a GeoJSON geometry representation.
    Author:
    Erwan Bocher

    • 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_AsGeoJSON()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      String getJavaStaticMethod()  
      static String toGeojson​(org.locationtech.jts.geom.Geometry geom)
      Convert the geometry to a GeoJSON representation.
      static String toGeojson​(org.locationtech.jts.geom.Geometry geom, int maxdecimaldigits)
      Convert the geometry to a GeoJSON representation.
      static void toGeojsonCoordinate​(org.locationtech.jts.geom.Coordinate coord, int maxdecimaldigits, StringBuilder sb)
      Convert a JTS coordinate to a GeoJSON representation.
      static void toGeojsonCoordinates​(org.locationtech.jts.geom.Coordinate[] coords, int maxdecimaldigits, StringBuilder sb)
      Convert a jts array of coordinates to a GeoJSON coordinates representation.
      String toGeoJsonEnvelope​(org.locationtech.jts.geom.Envelope e, int maxdecimaldigits)
      Convert a JTS Envelope to a GeoJSON representation.
      static void toGeojsonGeometry​(org.locationtech.jts.geom.Geometry geom, int maxdecimaldigits, StringBuilder sb)
      Transform a JTS geometry to a GeoJSON representation.
      static void toGeojsonGeometryCollection​(org.locationtech.jts.geom.GeometryCollection geometryCollection, int maxdecimaldigits, StringBuilder sb)
      A GeoJSON object with type "GeometryCollection" is a geometry object which represents a collection of geometry objects.
      static void toGeojsonLineString​(org.locationtech.jts.geom.LineString lineString, int maxdecimaldigits, StringBuilder sb)
      Coordinates of LineString are an array of positions.
      static void toGeojsonMultiLineString​(org.locationtech.jts.geom.MultiLineString multiLineString, int maxdecimaldigits, StringBuilder sb)
      Coordinates of a MultiLineString are an array of LineString coordinate arrays.
      static void toGeojsonMultiPoint​(org.locationtech.jts.geom.MultiPoint multiPoint, int maxdecimaldigits, StringBuilder sb)
      Coordinates of a MultiPoint are an array of positions.
      static void toGeojsonMultiPolygon​(org.locationtech.jts.geom.MultiPolygon multiPolygon, int maxdecimaldigits, StringBuilder sb)
      Coordinates of a MultiPolygon are an array of Polygon coordinate arrays.
      static void toGeojsonPoint​(org.locationtech.jts.geom.Point point, int maxdecimaldigits, StringBuilder sb)
      For type "Point", the "coordinates" member must be a single position.
      static void toGeojsonPolygon​(org.locationtech.jts.geom.Polygon polygon, int maxdecimaldigits, StringBuilder sb)
      Coordinates of a Polygon are an array of LinearRing coordinate arrays.

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

        addProperty, getProperty, removeProperty

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

        getProperty

    • Constructor Detail

      • ST_AsGeoJSON

        public ST_AsGeoJSON()

    • Method Detail

      • getJavaStaticMethod

        public String getJavaStaticMethod()

      • toGeojson

        public static String toGeojson​(org.locationtech.jts.geom.Geometry geom)
        Convert the geometry to a GeoJSON representation.
        Parameters:
        geom -
        Returns:

      • toGeojson

        public static String toGeojson​(org.locationtech.jts.geom.Geometry geom,
                               int maxdecimaldigits)
        Convert the geometry to a GeoJSON representation.
        Parameters:
        geom - input geometry
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        Returns:

      • toGeojsonGeometry

        public static void toGeojsonGeometry​(org.locationtech.jts.geom.Geometry geom,
                                     int maxdecimaldigits,
                                     StringBuilder sb)
        Transform a JTS geometry to a GeoJSON representation.
        Parameters:
        geom - input geometry
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonPoint

        public static void toGeojsonPoint​(org.locationtech.jts.geom.Point point,
                                  int maxdecimaldigits,
                                  StringBuilder sb)
        For type "Point", the "coordinates" member must be a single position. A position is the fundamental geometry construct. The "coordinates" member of a geometry object is composed of one position (in the case of a Point geometry), an array of positions (LineString or MultiPoint geometries), an array of arrays of positions (Polygons, MultiLineStrings), or a multidimensional array of positions (MultiPolygon). A position is represented by an array of numbers. There must be at least two elements, and may be more. The order of elements must follow x, y, z order (easting, northing, altitude for coordinates in a projected coordinate reference system, or longitude, latitude, altitude for coordinates in a geographic coordinate reference system). Any number of additional elements are allowed -- interpretation and meaning of additional elements is beyond the scope of this specification. Syntax: { "type": "Point", "coordinates": [100.0, 0.0] }
        Parameters:
        point -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonMultiPoint

        public static void toGeojsonMultiPoint​(org.locationtech.jts.geom.MultiPoint multiPoint,
                                       int maxdecimaldigits,
                                       StringBuilder sb)
        Coordinates of a MultiPoint are an array of positions. Syntax: { "type": "MultiPoint", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] }
        Parameters:
        multiPoint -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonLineString

        public static void toGeojsonLineString​(org.locationtech.jts.geom.LineString lineString,
                                       int maxdecimaldigits,
                                       StringBuilder sb)
        Coordinates of LineString are an array of positions. Syntax: { "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] }
        Parameters:
        lineString -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonMultiLineString

        public static void toGeojsonMultiLineString​(org.locationtech.jts.geom.MultiLineString multiLineString,
                                            int maxdecimaldigits,
                                            StringBuilder sb)
        Coordinates of a MultiLineString are an array of LineString coordinate arrays. Syntax: { "type": "MultiLineString", "coordinates": [ [ [100.0, 0.0], [101.0, 1.0] ], [ [102.0, 2.0], [103.0, 3.0] ] ] }
        Parameters:
        multiLineString -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonPolygon

        public static void toGeojsonPolygon​(org.locationtech.jts.geom.Polygon polygon,
                                    int maxdecimaldigits,
                                    StringBuilder sb)
        Coordinates of a Polygon are an array of LinearRing coordinate arrays. The first element in the array represents the exterior ring. Any subsequent elements represent interior rings (or holes). Syntax: No holes: { "type": "Polygon", "coordinates": [ [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ] ] } With holes: { "type": "Polygon", "coordinates": [ [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ], [ [100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2] ] ] }
        Parameters:
        polygon -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonMultiPolygon

        public static void toGeojsonMultiPolygon​(org.locationtech.jts.geom.MultiPolygon multiPolygon,
                                         int maxdecimaldigits,
                                         StringBuilder sb)
        Coordinates of a MultiPolygon are an array of Polygon coordinate arrays. Syntax: { "type": "MultiPolygon", "coordinates": [ [[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]], [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]], [[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]] ] }
        Parameters:
        multiPolygon -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonGeometryCollection

        public static void toGeojsonGeometryCollection​(org.locationtech.jts.geom.GeometryCollection geometryCollection,
                                               int maxdecimaldigits,
                                               StringBuilder sb)
        A GeoJSON object with type "GeometryCollection" is a geometry object which represents a collection of geometry objects. A geometry collection must have a member with the name "geometries". The value corresponding to "geometries"is an array. Each element in this array is a GeoJSON geometry object. Syntax: { "type": "GeometryCollection", "geometries": [ { "type": "Point", "coordinates": [100.0, 0.0] }, { "type": "LineString", "coordinates": [ [101.0, 0.0], [102.0, 1.0] ] } ] }
        Parameters:
        geometryCollection -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonCoordinates

        public static void toGeojsonCoordinates​(org.locationtech.jts.geom.Coordinate[] coords,
                                        int maxdecimaldigits,
                                        StringBuilder sb)
        Convert a jts array of coordinates to a GeoJSON coordinates representation. Syntax: [[X1,Y1],[X2,Y2]]
        Parameters:
        coords -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeojsonCoordinate

        public static void toGeojsonCoordinate​(org.locationtech.jts.geom.Coordinate coord,
                                       int maxdecimaldigits,
                                       StringBuilder sb)
        Convert a JTS coordinate to a GeoJSON representation. Only x, y and z values are supported. Syntax: [X,Y] or [X,Y,Z]
        Parameters:
        coord -
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        sb -

      • toGeoJsonEnvelope

        public String toGeoJsonEnvelope​(org.locationtech.jts.geom.Envelope e,
                                int maxdecimaldigits)
        Convert a JTS Envelope to a GeoJSON representation.
        Parameters:
        e - The envelope
        maxdecimaldigits - argument may be used to reduce the maximum number of decimal places
        Returns:
        The envelope encoded as GeoJSON