root / org.gvsig.geotools.proj / trunk / org.gvsig.geotools.proj / org.gvsig.geotools.proj.catalog.impl / src / main / java / org / gvsig / geotools / proj / catalog / utils / DistanceCalculator.java @ 867
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package org.gvsig.geotools.proj.catalog.utils; |
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import javax.measure.IncommensurableException; |
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import javax.measure.UnconvertibleException; |
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import javax.measure.Unit; |
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import javax.measure.quantity.Length; |
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import org.geotools.referencing.CRS; |
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import org.geotools.referencing.GeodeticCalculator; |
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import org.geotools.referencing.operation.transform.ConcatenatedTransform; |
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import org.gvsig.proj.catalog.exception.CoordinateReferenceSystemException; |
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import org.gvsig.proj.catalog.exception.TransformationException; |
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import org.gvsig.proj.catalog.exception.UnsupportedCoordinateReferenceSystemException; |
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import org.gvsig.proj.exception.DistanceCalculationException; |
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import org.opengis.referencing.crs.CompoundCRS; |
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import org.opengis.referencing.crs.CoordinateReferenceSystem; |
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import org.opengis.referencing.crs.GeneralDerivedCRS; |
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import org.opengis.referencing.crs.GeocentricCRS; |
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import org.opengis.referencing.crs.GeographicCRS; |
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import org.opengis.referencing.crs.ProjectedCRS; |
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import org.opengis.referencing.crs.SingleCRS; |
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import org.opengis.referencing.datum.GeodeticDatum; |
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import org.opengis.referencing.operation.MathTransform; |
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import org.opengis.referencing.operation.NoninvertibleTransformException; |
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import org.opengis.referencing.operation.TransformException; |
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/**
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* Utility class to calculate distances between two points, using different
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* calculation methods. Using this class provides performance improvements when
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* many distances have to be calculated. This class is NOT thread-safe, only one
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* distance can be calculated at the same time by one calculator instance.
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*
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* This class also provides static methods to calculate
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*
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* @author Cesar Martinez Izquierdo
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*
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*/
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public class DistanceCalculator { |
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CoordinateReferenceSystem crs; |
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GeodeticCalculator calculator; |
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public DistanceCalculator(CoordinateReferenceSystem crs) {
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this.crs = crs;
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calculator = new GeodeticCalculator(crs);
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} |
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/**
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* See {@link org.gvsig.proj.CoordinateReferenceSystem#getDistance(double[], double[], Unit)}
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* @throws CoordinateReferenceSystemException
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*/
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public double distance(double[] point1, double[] point2, |
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Unit<Length> targetUnit) throws CoordinateReferenceSystemException {
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return getDistance(this.crs, this.calculator, point1, point2, false, targetUnit); |
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} |
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/**
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* See {@link org.gvsig.proj.CoordinateReferenceSystem#getDistance(double[], double[], boolean, Unit)}
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* @throws CoordinateReferenceSystemException
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*/
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public double distance(double[] point1, double[] point2, boolean useBaseCRS, |
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Unit<Length> targetUnit) throws CoordinateReferenceSystemException {
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return getDistance(this.crs, this.calculator, point1, point2, useBaseCRS, targetUnit); |
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} |
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public static double getDistance(CoordinateReferenceSystem crs, |
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double[] point1, double[] point2, boolean useBaseCRS, |
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Unit<Length> targetUnit) throws CoordinateReferenceSystemException {
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return getDistance(crs, null, point1, point2, useBaseCRS, targetUnit); |
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} |
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public static double getDistance(CoordinateReferenceSystem crs, |
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GeodeticCalculator calculator, |
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double[] point1, double[] point2, boolean useBaseCRS, |
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Unit<Length> targetUnit) throws CoordinateReferenceSystemException {
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try {
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if (crs instanceof GeographicCRS) { |
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return getDistanceGeo((GeographicCRS)crs, getGeodeticCalInstance(calculator, crs), point1, point2, targetUnit);
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} |
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else if (crs instanceof GeneralDerivedCRS) { |
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if (useBaseCRS) {
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GeographicCRS baseCRS = getBaseGeographicCRS((GeneralDerivedCRS)crs); |
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if (baseCRS != null) { |
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MathTransform mt = getConversionToGeo((GeneralDerivedCRS)crs); |
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double[] point1geo = new double[2], point2geo = new double[2]; |
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mt.transform(point1, 0, point1geo, 0, 1); |
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mt.transform(point2, 0, point2geo, 0, 1); |
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return getDistanceGeo(baseCRS, getGeodeticCalInstance(calculator, crs), point1geo, point2geo, targetUnit);
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} |
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} |
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else {
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return getEuclideanDistance2D((SingleCRS)crs, point1, point2, targetUnit);
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} |
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} |
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else if (crs instanceof GeocentricCRS) { |
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return getEuclideanDistance3D((SingleCRS)crs, point1, point2, targetUnit);
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} |
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else if (crs instanceof CompoundCRS) { |
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SingleCRS horizontalCRS = CRS.getHorizontalCRS(crs); |
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return getDistance(horizontalCRS, getGeodeticCalInstance(calculator, crs), point1, point2, useBaseCRS, targetUnit);
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} |
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} catch (UnsupportedCoordinateReferenceSystemException
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| UnconvertibleException | UnsupportedOperationException
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| IllegalArgumentException | IllegalStateException |
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| IncommensurableException | TransformException |
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| TransformationException e) {
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throw new DistanceCalculationException(GtUtils.getIdentifier(crs), e); |
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} |
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throw new DistanceCalculationException(GtUtils.getIdentifier(crs)); |
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} |
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/**
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* Creates a GeodeticCalculator instance if needed
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* @param calculator
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* @param crs
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* @return
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*/
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private static GeodeticCalculator getGeodeticCalInstance(GeodeticCalculator calculator, CoordinateReferenceSystem crs) { |
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if (calculator==null) { |
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return new GeodeticCalculator(crs); |
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} |
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return calculator;
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} |
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public static double getEuclideanDistance2D(SingleCRS crs, |
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double[] point1, double[] point2, |
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Unit<Length> targetUnit) |
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throws CoordinateReferenceSystemException,
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UnconvertibleException, |
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IncommensurableException {
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double euclidean = Math.sqrt(Math.pow(point1[0]-point2[0], 2.0)+Math.pow(point1[1]-point2[1], 2.0)); |
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Unit<?> unit = crs.getCoordinateSystem().getAxis(0).getUnit();
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return unit.getConverterToAny(targetUnit).convert(euclidean);
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} |
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public static double getEuclideanDistance3D(SingleCRS crs, |
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double[] point1, double[] point2, |
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Unit<Length> targetUnit) |
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throws CoordinateReferenceSystemException,
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UnconvertibleException, IncommensurableException {
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double euclidean = Math.sqrt(Math.pow(point1[0]-point2[0], 2.0) |
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+Math.pow(point1[1]-point2[1], 2.0) |
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+Math.pow(point1[2]-point2[2], 2.0)); |
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Unit<?> unit = crs.getCoordinateSystem().getAxis(0).getUnit();
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return unit.getConverterToAny(targetUnit).convert(euclidean);
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} |
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public static MathTransform getConversionToGeo(GeneralDerivedCRS crs) throws TransformationException { |
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CoordinateReferenceSystem baseCRS = crs.getBaseCRS(); |
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if (baseCRS instanceof GeographicCRS) { |
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try {
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return crs.getConversionFromBase().getMathTransform().inverse();
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} catch (NoninvertibleTransformException e) { |
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throw new TransformationException(GtUtils.getIdentifier(crs), e); |
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} |
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} |
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if (baseCRS instanceof GeneralDerivedCRS && baseCRS!=crs) { |
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try {
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MathTransform baseTransform = crs.getConversionFromBase().getMathTransform().inverse(); |
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ConcatenatedTransform.create(baseTransform, getConversionToGeo((GeneralDerivedCRS)baseCRS)); |
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} catch (NoninvertibleTransformException e) { |
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throw new TransformationException(GtUtils.getIdentifier(crs), e); |
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} |
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} |
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throw new TransformationException(GtUtils.getIdentifier(crs)); |
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} |
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public static GeographicCRS getBaseGeographicCRS(GeneralDerivedCRS crs) { |
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CoordinateReferenceSystem baseCRS = crs.getBaseCRS(); |
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if (baseCRS instanceof GeographicCRS) { |
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return (GeographicCRS) baseCRS;
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} |
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if (baseCRS instanceof GeneralDerivedCRS && baseCRS!=crs) { |
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return getBaseGeographicCRS((GeneralDerivedCRS)baseCRS);
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} |
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return null; |
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} |
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public static double getDistanceGeo(GeographicCRS crs, |
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GeodeticCalculator calculator, |
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double[] point1, double[] point2, |
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Unit<Length> targetUnit) throws CoordinateReferenceSystemException,
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UnconvertibleException, IncommensurableException {
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calculator.setStartingGeographicPoint(point1[0], point1[1]); |
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calculator.setDestinationGeographicPoint(point2[0], point2[1]); |
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double distance = calculator.getOrthodromicDistance();
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Unit<?> unit = ((GeodeticDatum)crs.getDatum()).getEllipsoid().getAxisUnit(); |
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return unit.getConverterToAny(targetUnit).convert(distance);
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} |
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} |