org.opengis.cite.geomatics

Class Extents

java.lang.Object

org.opengis.cite.geomatics.Extents

public class Extents
extends Object

Provides utility methods to create or operate on envelope representations.

Method Summary

Methods

Modifier and Type	Method and Description
static Envelope	calculateEnvelope(NodeList geomNodes) Calculates the envelope that covers the given collection of GML geometry elements.
static Document	envelopeAsGML(Envelope envelope) Generates a standard GML representation (gml:Envelope) of an Envelope object.
static Polygon	envelopeAsPolygon(Envelope envelope) Creates a JTS Polygon having the same extent as the given envelope.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

calculateEnvelope

public static Envelope calculateEnvelope(NodeList geomNodes)
                                  throws JAXBException

Calculates the envelope that covers the given collection of GML geometry elements.

Parameters:

geomNodes - A NodeList containing GML geometry elements; it is assumed these all refer to the same CRS.

Returns:

An Envelope object representing the overall spatial extent (MBR) of the geometries.

Throws:

JAXBException - If a node cannot be unmarshalled to a geometry object.

envelopeAsGML

public static Document envelopeAsGML(Envelope envelope)

Generates a standard GML representation (gml:Envelope) of an Envelope object. Ordinates are rounded down to 2 decimal places.

Parameters:

envelope - An Envelope defining a bounding rectangle (or prism).

Returns:

A DOM Document with gml:Envelope as the document element.

envelopeAsPolygon

public static Polygon envelopeAsPolygon(Envelope envelope)

Creates a JTS Polygon having the same extent as the given envelope.

Parameters:

envelope - An Envelope defining a bounding rectangle.

Returns:

A Polygon with the relevant CoordinateReferenceSystem set as a user data object.