ucar.nc2.dataset.transform.RotatedLatLon Maven / Gradle / Ivy

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/*
 * Copyright (c) 1998-2018 John Caron and University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */

package ucar.nc2.dataset.transform;

import ucar.nc2.AttributeContainer;
import ucar.nc2.dataset.ProjectionCT;

/**
 * Create a Rotated LatLon Projection from the information in the Coordinate Transform Variable.
 */
public class RotatedLatLon extends AbstractTransformBuilder implements HorizTransformBuilderIF {

  public String getTransformName() {
    return ucar.unidata.geoloc.projection.RotatedLatLon.GRID_MAPPING_NAME;
  }

  public ProjectionCT makeCoordinateTransform(AttributeContainer ctv, String geoCoordinateUnits) {
    double lon =
        readAttributeDouble(ctv, ucar.unidata.geoloc.projection.RotatedLatLon.GRID_SOUTH_POLE_LONGITUDE, Double.NaN);
    double lat =
        readAttributeDouble(ctv, ucar.unidata.geoloc.projection.RotatedLatLon.GRID_SOUTH_POLE_LATITUDE, Double.NaN);
    double angle =
        readAttributeDouble(ctv, ucar.unidata.geoloc.projection.RotatedLatLon.GRID_SOUTH_POLE_ANGLE, Double.NaN);

    ucar.unidata.geoloc.projection.RotatedLatLon proj =
        new ucar.unidata.geoloc.projection.RotatedLatLon(lat, lon, angle);
    return new ProjectionCT(ctv.getName(), "FGDC", proj);
  }

}