Examples with Ellipsoid org.opengis.referencing.datum.Ellipsoid used on opensource projects

Example 6 with Ellipsoid

use of org.opengis.referencing.datum.Ellipsoid in project sis by apache.

the class InterpolatedGeocentricTransformTest method createGeodeticTransformation.

/**
 * Creates the transform using the given provider.
 */
final void createGeodeticTransformation(final FranceGeocentricInterpolation provider) throws FactoryException {
    final URL file = FranceGeocentricInterpolationTest.getResourceAsConvertibleURL(FranceGeocentricInterpolationTest.TEST_FILE);
    // Clarke 1880 (IGN)
    final Ellipsoid source = HardCodedDatum.NTF.getEllipsoid();
    // GRS 1980 ellipsoid
    final Ellipsoid target = CommonCRS.ETRS89.ellipsoid();
    final ParameterValueGroup values = provider.getParameters().createValue();
    values.parameter("src_semi_major").setValue(source.getSemiMajorAxis());
    values.parameter("src_semi_minor").setValue(source.getSemiMinorAxis());
    values.parameter("tgt_semi_major").setValue(target.getSemiMajorAxis());
    values.parameter("tgt_semi_minor").setValue(target.getSemiMinorAxis());
    // Automatic conversion from URL to Path.
    values.parameter("Geocentric translation file").setValue(file);
    transform = provider.createMathTransform(DefaultFactories.forBuildin(MathTransformFactory.class), values);
    tolerance = FranceGeocentricInterpolationTest.ANGULAR_TOLERANCE;
}

Example 7 with Ellipsoid

use of org.opengis.referencing.datum.Ellipsoid in project sis by apache.

the class StandardDefinitionsTest method testCreateGeographicCRS.

/**
 * Compares the values created by {@code StandardDefinitions} against hard-coded constants.
 * This method tests the following methods:
 *
 * <ul>
 *   <li>{@link StandardDefinitions#createEllipsoid(short)}</li>
 *   <li>{@link StandardDefinitions#createGeodeticDatum(short, Ellipsoid, PrimeMeridian)}</li>
 *   <li>{@link StandardDefinitions#createGeographicCRS(short, GeodeticDatum, EllipsoidalCS)}</li>
 * </ul>
 *
 * The geodetic objects are compared against the {@link HardCodedCRS}, {@link HardCodedDatum} and
 * {@link GeodeticDatumMock} constants. Actually this is more a test of the above-cited constants
 * than a {@code StandardDefinitions} one - in case of test failure, any of those classes could be
 * at fault.
 */
@Test
@DependsOnMethod("testCreateAxis")
public void testCreateGeographicCRS() {
    final PrimeMeridian pm = StandardDefinitions.primeMeridian();
    final EllipsoidalCS cs = (EllipsoidalCS) StandardDefinitions.createCoordinateSystem((short) 6422);
    for (final CommonCRS e : CommonCRS.values()) {
        final Ellipsoid ellipsoid = StandardDefinitions.createEllipsoid(e.ellipsoid);
        switch(e) {
            case WGS84:
                compare(GeodeticDatumMock.WGS84.getEllipsoid(), ellipsoid);
                break;
            case WGS72:
                compare(GeodeticDatumMock.WGS72.getEllipsoid(), ellipsoid);
                break;
            case NAD83:
                compare(GeodeticDatumMock.NAD83.getEllipsoid(), ellipsoid);
                break;
            case NAD27:
                compare(GeodeticDatumMock.NAD27.getEllipsoid(), ellipsoid);
                break;
            case SPHERE:
                compare(GeodeticDatumMock.SPHERE.getEllipsoid(), ellipsoid);
                break;
        }
        final GeodeticDatum datum = StandardDefinitions.createGeodeticDatum(e.datum, ellipsoid, pm);
        switch(e) {
            case WGS84:
                compare(HardCodedDatum.WGS84, datum);
                break;
            case WGS72:
                compare(HardCodedDatum.WGS72, datum);
                break;
            case SPHERE:
                compare(HardCodedDatum.SPHERE, datum);
                break;
        }
        final GeographicCRS crs = StandardDefinitions.createGeographicCRS(e.geographic, datum, cs);
        Validators.validate(crs);
        switch(e) {
            case WGS84:
                compare(HardCodedCRS.WGS84, crs);
                break;
        }
        Validators.validate(crs);
    }
}

Example 8 with Ellipsoid

use of org.opengis.referencing.datum.Ellipsoid in project sis by apache.

the class Proj4 method definition.

/**
 * Infers a {@literal Proj.4} definition from the given projected, geographic or geocentric coordinate reference system.
 * This method does not need the Proj.4 native library; it can be used in a pure Java application.
 * However the returned definition string may differ depending on whether the Proj.4 library is available or not.
 *
 * @param  crs  the coordinate reference system for which to create a Proj.4 definition.
 * @return the definition of the given CRS in a Proj.4 format.
 * @throws FactoryException if the Proj.4 definition string can not be created from the given CRS.
 */
public static String definition(final CoordinateReferenceSystem crs) throws FactoryException {
    ArgumentChecks.ensureNonNull("crs", crs);
    /*
         * If the given CRS object is associated to a Proj.4 structure, let Proj.4 formats itself
         * the definition string. Note that this operation may fail if there is no Proj.4 library
         * in the current system, or no JNI bindings to that library.
         */
    try {
        for (final Identifier id : crs.getIdentifiers()) {
            if (id instanceof PJ) {
                return ((PJ) id).getCode();
            }
        }
    } catch (UnsatisfiedLinkError e) {
        // Thrown the first time that we try to use the library.
        Logging.unexpectedException(Logging.getLogger(Modules.GDAL), Proj4.class, "definition", e);
    } catch (NoClassDefFoundError e) {
        // Thrown on all attempts after the first one.
        Logging.recoverableException(Logging.getLogger(Modules.GDAL), Proj4.class, "definition", e);
    }
    /*
         * If we found no Proj.4 structure, formats the definition string ourself. The string may differ from
         * what Proj.4 would have given. In particular, we do not provide "+init=" or "+datum=" parameter.
         * But the definition should still be semantically equivalent.
         */
    final String method;
    final GeodeticDatum datum;
    final ParameterValueGroup parameters;
    final CoordinateSystem cs = crs.getCoordinateSystem();
    if (crs instanceof GeodeticCRS) {
        if (cs instanceof EllipsoidalCS) {
            method = "latlon";
        } else if (cs instanceof CartesianCS) {
            method = "geocent";
        } else {
            throw new FactoryException(Errors.format(Errors.Keys.UnsupportedCoordinateSystem_1, cs.getClass()));
        }
        datum = ((GeodeticCRS) crs).getDatum();
        parameters = null;
    } else if (crs instanceof ProjectedCRS) {
        Projection c = ((ProjectedCRS) crs).getConversionFromBase();
        datum = ((ProjectedCRS) crs).getDatum();
        method = name(c.getMethod());
        parameters = c.getParameterValues();
    } else {
        throw new FactoryException(Errors.format(Errors.Keys.UnsupportedType_1, crs.getClass()));
    }
    /*
         * Append the map projection parameters. Those parameters may include axis lengths (a and b),
         * but not necessarily. If axis lengths are specified, then we will ignore the Ellipsoid instance
         * associated to the CRS.
         */
    final StringBuilder definition = new StringBuilder(100);
    definition.append(Proj4Factory.PROJ_PARAM).append(method);
    boolean hasSemiMajor = false;
    boolean hasSemiMinor = false;
    if (parameters != null) {
        definition.append(Proj4Factory.STANDARD_OPTIONS);
        for (final GeneralParameterValue parameter : parameters.values()) {
            if (parameter instanceof ParameterValue<?>) {
                final ParameterValue<?> pv = (ParameterValue<?>) parameter;
                final Object value;
                Unit<?> unit = pv.getUnit();
                if (unit != null) {
                    unit = Units.isAngular(unit) ? Units.DEGREE : unit.getSystemUnit();
                    // Always in metres or degrees.
                    value = pv.doubleValue(unit);
                } else {
                    value = pv.getValue();
                    if (value == null) {
                        continue;
                    }
                }
                final String pn = name(parameter.getDescriptor());
                hasSemiMajor |= pn.equals("a");
                hasSemiMinor |= pn.equals("b");
                definition.append(" +").append(pn).append('=').append(value);
            }
        }
    }
    /*
         * Append datum information: axis lengths if they were not part of the parameters, then prime meridian.
         */
    final Ellipsoid ellipsoid = datum.getEllipsoid();
    if (!hasSemiMajor)
        definition.append(" +a=").append(ellipsoid.getSemiMajorAxis());
    if (!hasSemiMinor)
        definition.append(" +b=").append(ellipsoid.getSemiMinorAxis());
    final PrimeMeridian pm = datum.getPrimeMeridian();
    if (pm != null) {
        double lon = pm.getGreenwichLongitude();
        final Unit<Angle> unit = pm.getAngularUnit();
        if (unit != null) {
            lon = unit.getConverterTo(Units.DEGREE).convert(lon);
        }
        definition.append(" +pm=").append(lon);
    }
    /*
         * Appends axis directions. This method always format a vertical direction (up or down)
         * even if the coordinate system is two-dimensional, because Proj.4 seems to require it.
         * Also extract axis units in the process.
         */
    // Horizontal at index 0, vertical at index 1.
    final Unit<?>[] units = new Unit<?>[2];
    boolean validCS = true;
    definition.append(' ').append(Proj4Factory.AXIS_ORDER_PARAM);
    final int dimension = Math.min(cs.getDimension(), 3);
    boolean hasVertical = false;
    for (int i = 0; i < dimension; i++) {
        final CoordinateSystemAxis axis = cs.getAxis(i);
        final AxisDirection dir = axis.getDirection();
        int unitIndex = 0;
        if (!AxisDirections.isCardinal(dir)) {
            if (!AxisDirections.isVertical(dir)) {
                throw new FactoryException(Errors.format(Errors.Keys.UnsupportedAxisDirection_1, dir));
            }
            hasVertical = true;
            unitIndex = 1;
        }
        final Unit<?> old = units[unitIndex];
        units[unitIndex] = axis.getUnit();
        validCS &= (old == null || old.equals(units[unitIndex]));
        definition.appendCodePoint(Character.toLowerCase(dir.name().codePointAt(0)));
    }
    if (!hasVertical && dimension < 3) {
        // Add a UP direction if not already present.
        definition.append('u');
    }
    /*
         * Append units of measurement, then verify the coordinate system validity.
         */
    for (int i = 0; i < units.length; i++) {
        final Unit<?> unit = units[i];
        if (unit != null && !unit.equals(Units.DEGREE) && !unit.equals(Units.METRE)) {
            validCS &= Units.isLinear(unit);
            definition.append(" +");
            // "+vto_meter" parameter.
            if (i == 1)
                definition.append('v');
            definition.append("to_meter=").append(Units.toStandardUnit(unit));
        }
    }
    /*
         * Append the "+towgs84" element if any. This is the last piece of information.
         * Note that the use of a "+towgs84" parameter is an "early binding" approach,
         * which is usually not recommended. But Proj4 works that way.
         */
    if (validCS) {
        if (datum instanceof DefaultGeodeticDatum) {
            for (final BursaWolfParameters bwp : ((DefaultGeodeticDatum) datum).getBursaWolfParameters()) {
                if (Utilities.equalsIgnoreMetadata(CommonCRS.WGS84.datum(), bwp.getTargetDatum())) {
                    definition.append(" +towgs84=").append(bwp.tX).append(',').append(bwp.tY).append(',').append(bwp.tZ);
                    if (!bwp.isTranslation()) {
                        definition.append(',').append(bwp.rX).append(',').append(bwp.rY).append(',').append(bwp.rZ).append(',').append(bwp.dS);
                    }
                    break;
                }
            }
        }
        return definition.toString();
    }
    /*
         * If we reach this point, we detected a coordinate system that we can not format as a
         * Proj.4 definition string. Format an error message with axis directions and units.
         */
    definition.setLength(0);
    definition.append('(');
    for (int i = 0; i < units.length; i++) {
        final CoordinateSystemAxis axis = cs.getAxis(i);
        if (i != 0)
            definition.append(", ");
        definition.append(axis.getUnit()).append(' ').append(Types.getCodeName(axis.getDirection()));
    }
    throw new FactoryException(Errors.format(Errors.Keys.IllegalCoordinateSystem_1, definition.append(')')));
}

Example 9 with Ellipsoid

use of org.opengis.referencing.datum.Ellipsoid in project sis by apache.

the class CRSBuilder method verify.

/**
 * Verifies if the user-defined datum created from GeoTIFF values
 * matches the given datum created from the EPSG geodetic dataset.
 * This method does not verify the EPSG code of the given datum.
 *
 * @param  datum        the datum created from the EPSG geodetic dataset.
 * @param  angularUnit  unit of measurement declared in the GeoTIFF file.
 * @param  linearUnit   unit of measurement declared in the GeoTIFF file.
 */
private void verify(final GeodeticDatum datum, final Unit<Angle> angularUnit, final Unit<Length> linearUnit) {
    final PrimeMeridian pm = datum.getPrimeMeridian();
    verifyIdentifier(datum, pm, GeoKeys.PrimeMeridian);
    verify(pm, angularUnit);
    final Ellipsoid ellipsoid = datum.getEllipsoid();
    verifyIdentifier(datum, ellipsoid, GeoKeys.Ellipsoid);
    verify(ellipsoid, linearUnit);
}