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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
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 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
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 * and/or Unidata, however, may not be used in any advertising or publicity
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package ucar.nc2.dataset.transform;

import ucar.nc2.dataset.*;
import ucar.nc2.Variable;
import ucar.unidata.geoloc.projection.proj4.AlbersEqualAreaEllipse;
import ucar.unidata.geoloc.Earth;

/**
 * Create a LambertConformalConic Projection from the information in the Coordinate Transform Variable.
 *
 * @author caron
 */
public class LambertConformalConic extends AbstractCoordTransBuilder {

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

  public TransformType getTransformType() {
    return TransformType.Projection;
  }

  public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds, Variable ctv) {
    double[] pars = readAttributeDouble2(ctv.findAttribute( "standard_parallel"));
    if (pars == null) return null;

    double lon0 = readAttributeDouble( ctv, "longitude_of_central_meridian", Double.NaN);
    double lat0 = readAttributeDouble( ctv, "latitude_of_projection_origin", Double.NaN);
    double false_easting = readAttributeDouble(ctv, "false_easting", 0.0);
    double false_northing = readAttributeDouble(ctv, "false_northing", 0.0);

    if ((false_easting != 0.0) || (false_northing != 0.0)) {
      double scalef = getFalseEastingScaleFactor(ds, ctv);
      false_easting *= scalef;
      false_northing *= scalef;
    }

    // these must be in meters, projection needs them in km
    double earth_radius = readAttributeDouble(ctv, "earth_radius", Earth.getRadius()) * .001;

    double semi_major_axis = readAttributeDouble(ctv, "semi_major_axis", Double.NaN);
    double semi_minor_axis = readAttributeDouble(ctv, "semi_minor_axis", Double.NaN);
    double inverse_flattening = readAttributeDouble(ctv, "inverse_flattening", 0.0);

    ucar.unidata.geoloc.ProjectionImpl proj;

    // check for ellipsoidal earth
    if (!Double.isNaN(semi_major_axis) && (!Double.isNaN(semi_minor_axis) || inverse_flattening != 0.0)) {
      Earth earth = new Earth(semi_major_axis, semi_minor_axis, inverse_flattening);
      proj = new ucar.unidata.geoloc.projection.proj4.LambertConformalConicEllipse(lat0, lon0, pars[0], pars[1], false_easting, false_northing, earth);

    } else {
      proj = new ucar.unidata.geoloc.projection.LambertConformal(lat0, lon0, pars[0], pars[1], false_easting, false_northing, earth_radius);
    }

    return new ProjectionCT(ctv.getShortName(), "FGDC", proj);
  }
}