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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.constants.CF;
import ucar.nc2.dataset.ProjectionCT;

/**
 * Create a "FlatEarth" Projection from the information in the Coordinate Transform Variable.
 *
 * @author caron
 */
public class FlatEarth extends AbstractTransformBuilder implements HorizTransformBuilderIF {

  public String getTransformName() {
    return "flat_earth";
  }

  public ProjectionCT makeCoordinateTransform(AttributeContainer ctv, String geoCoordinateUnits) {
    double lon0 = readAttributeDouble( ctv, CF.LONGITUDE_OF_PROJECTION_ORIGIN, Double.NaN);
    double lat0 = readAttributeDouble( ctv, CF.LATITUDE_OF_PROJECTION_ORIGIN, Double.NaN);
    double rot = readAttributeDouble( ctv, ucar.unidata.geoloc.projection.FlatEarth.ROTATIONANGLE, 0.0);
    double earth_radius = getEarthRadiusInKm(ctv);

    ucar.unidata.geoloc.projection.FlatEarth proj = new ucar.unidata.geoloc.projection.FlatEarth(lat0, lon0, rot, earth_radius);
    return new ProjectionCT(ctv.getName(), "FGDC", proj);
  }
}