/*
* Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
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package ucar.nc2.dataset.transform;
import ucar.nc2.constants.CF;
import ucar.nc2.dataset.*;
import ucar.nc2.Variable;
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 CF.LAMBERT_CONFORMAL_CONIC;
}
public TransformType getTransformType() {
return TransformType.Projection;
}
public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds, Variable ctv) {
double[] pars = readAttributeDouble2(ctv.findAttribute( CF.STANDARD_PARALLEL));
if (pars == null) return null;
double lon0 = readAttributeDouble( ctv, CF.LONGITUDE_OF_CENTRAL_MERIDIAN, Double.NaN);
double lat0 = readAttributeDouble( ctv, CF.LATITUDE_OF_PROJECTION_ORIGIN, Double.NaN);
double false_easting = readAttributeDouble(ctv, CF.FALSE_EASTING, 0.0);
double false_northing = readAttributeDouble(ctv, CF.FALSE_NORTHING, 0.0);
if ((false_easting != 0.0) || (false_northing != 0.0)) {
double scalef = getFalseEastingScaleFactor(ds, ctv);
false_easting *= scalef;
false_northing *= scalef;
}
double earth_radius = getEarthRadiusInKm(ctv);
double semi_major_axis = readAttributeDouble(ctv, CF.SEMI_MAJOR_AXIS, Double.NaN);
double semi_minor_axis = readAttributeDouble(ctv, CF.SEMI_MINOR_AXIS, Double.NaN);
double inverse_flattening = readAttributeDouble(ctv, CF.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);
}
}