/*
* 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.
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package ucar.nc2.dataset.transform;
import ucar.nc2.dataset.TransformType;
import ucar.nc2.dataset.CoordinateTransform;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.dataset.VerticalCT;
import ucar.nc2.Variable;
import ucar.nc2.Dimension;
import ucar.unidata.geoloc.vertical.AtmosLnPressure;
import ucar.unidata.util.Parameter;
/**
* implementation for CF vertical coordinate "atmosphere_ln_pressure_coordinate".
* DO NOT USE: see CF1Convention.makeAtmLnCoordinate()
* @author caron
* @since May 6, 2008
*/
public class VAtmLnPressure extends AbstractCoordTransBuilder {
private String p0, lev;
public String getTransformName() {
return "atmosphere_ln_pressure_coordinate";
}
public TransformType getTransformType() {
return TransformType.Vertical;
}
public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds, Variable ctv) {
String formula_terms = getFormula(ds, ctv);
if (null == formula_terms) return null;
// parse the formula string
String[] values = parseFormula(formula_terms, "p0 lev");
if (values == null) return null;
p0 = values[0];
lev = values[1];
CoordinateTransform rs = new VerticalCT("AtmSigma_Transform_"+ctv.getShortName(), getTransformName(), VerticalCT.Type.Sigma, this);
rs.addParameter(new Parameter("standard_name", getTransformName()));
rs.addParameter(new Parameter("formula_terms", formula_terms));
rs.addParameter(new Parameter("formula", "pressure(z) = p0 * exp(-lev(k))"));
if (!addParameter( rs, AtmosLnPressure.P0, ds, p0)) return null;
if (!addParameter( rs, AtmosLnPressure.LEV, ds, lev)) return null;
return rs;
}
public String toString() {
return "AtmLnPressure:" + "p0:"+p0 + " lev:"+lev;
}
public ucar.unidata.geoloc.vertical.VerticalTransform makeMathTransform(NetcdfDataset ds, Dimension timeDim, VerticalCT vCT) {
return new AtmosLnPressure(ds, timeDim, vCT.getParameters());
}
}