/*
* 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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* 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.Attribute;
import ucar.nc2.dataset.CoordinateTransform;
import ucar.nc2.dataset.ProjectionCT;
import ucar.nc2.dataset.TransformType;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.Variable;
import ucar.unidata.geoloc.projection.UtmProjection;
/**
* Create a UTM Projection from the information in the Coordinate Transform Variable.
* *
* @author caron
*/
public class UTM extends AbstractCoordTransBuilder {
public String getTransformName() {
return UtmProjection.GRID_MAPPING_NAME;
}
public TransformType getTransformType() {
return TransformType.Projection;
}
public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds, Variable ctv) {
double zoned = readAttributeDouble( ctv, UtmProjection.UTM_ZONE1, Double.NaN);
if (Double.isNaN(zoned))
zoned = readAttributeDouble( ctv, UtmProjection.UTM_ZONE2, Double.NaN);
if (Double.isNaN(zoned))
throw new IllegalArgumentException("No zone was specified") ;
int zone = (int) zoned;
boolean isNorth = zone > 0;
zone = Math.abs(zone);
Attribute a;
double axis = 0.0, f = 0.0;
if (null != (a = ctv.findAttribute( "semimajor_axis")))
axis = a.getNumericValue().doubleValue();
if (null != (a = ctv.findAttribute( "inverse_flattening")))
f = a.getNumericValue().doubleValue();
// double a, double f, int zone, boolean isNorth
UtmProjection proj = (axis != 0.0) ? new UtmProjection(axis, f, zone, isNorth) : new UtmProjection(zone, isNorth);
return new ProjectionCT(ctv.getShortName(), "FGDC", proj);
}
}