org.h2gis.drivers.geojson
Class ST_AsGeoJSON

java.lang.Object
  org.h2gis.h2spatialapi.AbstractFunction
      org.h2gis.h2spatialapi.DeterministicScalarFunction
          org.h2gis.drivers.geojson.ST_AsGeoJSON

All Implemented Interfaces:

Function, ScalarFunction

public class ST_AsGeoJSON
extends DeterministicScalarFunction

Transform a JTS geometry to a GeoJSON geometry representation.

Author:

Erwan Bocher

Field Summary

Fields inherited from interface org.h2gis.h2spatialapi.ScalarFunction

PROP_DETERMINISTIC, PROP_NOBUFFER

Fields inherited from interface org.h2gis.h2spatialapi.Function

PROP_NAME, PROP_REMARKS

Constructor Summary

ST_AsGeoJSON()

Method Summary

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

Methods inherited from class org.h2gis.h2spatialapi.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.h2spatialapi.Function

getProperty

Constructor Detail

ST_AsGeoJSON

public ST_AsGeoJSON()

Method Detail

getJavaStaticMethod

public String getJavaStaticMethod()

toGeojson

public static String toGeojson(com.vividsolutions.jts.geom.Geometry geom)

Convert the geometry to a GeoJSON representation.

Parameters:

geom -

Returns:

toGeojsonGeometry

public static void toGeojsonGeometry(com.vividsolutions.jts.geom.Geometry geom,
                                     StringBuilder sb)

Transform a JTS geometry to a GeoJSON representation.

Parameters:

geom -

sb -

toGeojsonPoint

public static void toGeojsonPoint(com.vividsolutions.jts.geom.Point point,
                                  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 -

sb -

toGeojsonMultiPoint

public static void toGeojsonMultiPoint(com.vividsolutions.jts.geom.MultiPoint multiPoint,
                                       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 -

sb -

toGeojsonLineString

public static void toGeojsonLineString(com.vividsolutions.jts.geom.LineString lineString,
                                       StringBuilder sb)

Coordinates of LineString are an array of positions. Syntax: { "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] }

Parameters:

lineString -

sb -

toGeojsonMultiLineString

public static void toGeojsonMultiLineString(com.vividsolutions.jts.geom.MultiLineString multiLineString,
                                            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 -

sb -

toGeojsonPolygon

public static void toGeojsonPolygon(com.vividsolutions.jts.geom.Polygon polygon,
                                    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 -

sb -

toGeojsonMultiPolygon

public static void toGeojsonMultiPolygon(com.vividsolutions.jts.geom.MultiPolygon multiPolygon,
                                         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 -

sb -

toGeojsonGeometryCollection

public static void toGeojsonGeometryCollection(com.vividsolutions.jts.geom.GeometryCollection geometryCollection,
                                               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 -

sb -

toGeojsonCoordinates

public static void toGeojsonCoordinates(com.vividsolutions.jts.geom.Coordinate[] coords,
                                        StringBuilder sb)

Convert a jts array of coordinates to a GeoJSON coordinates representation. Syntax: [[X1,Y1],[X2,Y2]]

Parameters:

coords -

sb -

toGeojsonCoordinate

public static void toGeojsonCoordinate(com.vividsolutions.jts.geom.Coordinate coord,
                                       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 -

sb -

toGeoJsonEnvelope

public String toGeoJsonEnvelope(com.vividsolutions.jts.geom.Envelope e)

Convert a JTS Envelope to a GeoJSON representation.

Parameters:

e - The envelope

Returns:

The envelope encoded as GeoJSON