/*
* 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.
*
* 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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package ucar.nc2.dataset.transform;
import ucar.nc2.constants.CF;
import ucar.nc2.dataset.CoordinateTransform;
import ucar.nc2.dataset.ProjectionCT;
import ucar.nc2.dataset.TransformType;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.Variable;
/**
* Create a Mercator Projection from the information in the Coordinate Transform Variable.
*
* @author caron
*/
public class Mercator extends AbstractCoordTransBuilder {
@Override
public String getTransformName() {
return CF.MERCATOR;
}
@Override
public TransformType getTransformType() {
return TransformType.Projection;
}
@Override
public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds, Variable ctv) {
double par = readAttributeDouble( ctv, CF.STANDARD_PARALLEL, Double.NaN);
if (Double.isNaN(par)) {
double scale = readAttributeDouble( ctv, CF.SCALE_FACTOR_AT_PROJECTION_ORIGIN, Double.NaN);
if (Double.isNaN(scale))
throw new IllegalArgumentException("Mercator projection must have attribute " +
CF.STANDARD_PARALLEL + " or " + CF.SCALE_FACTOR_AT_PROJECTION_ORIGIN);
par = ucar.unidata.geoloc.projection.Mercator.convertScaleToStandardParallel(scale);
}
double lon0 = readAttributeDouble( ctv, CF.LONGITUDE_OF_PROJECTION_ORIGIN, Double.NaN);
double lat0 = readAttributeDouble( ctv, CF.LATITUDE_OF_PROJECTION_ORIGIN, Double.NaN); // LOOK not used
double false_easting = readAttributeDouble(ctv, CF.FALSE_EASTING, 0.0);
double false_northing = readAttributeDouble(ctv, CF.FALSE_NORTHING, 0.0);
double earth_radius = getEarthRadiusInKm(ctv);
if ((false_easting != 0.0) || (false_northing != 0.0)) {
double scalef = getFalseEastingScaleFactor(ds, ctv);
false_easting *= scalef;
false_northing *= scalef;
}
ucar.unidata.geoloc.projection.Mercator proj =
new ucar.unidata.geoloc.projection.Mercator( lon0, par, false_easting, false_northing, earth_radius);
return new ProjectionCT(ctv.getShortName(), "FGDC", proj);
}
}