/*
* 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.*;
import ucar.nc2.Variable;
import ucar.nc2.Dimension;
import ucar.unidata.geoloc.vertical.HybridSigmaPressure;
import ucar.unidata.util.Parameter;
/**
* Create a atmosphere_hybrid_sigma_pressure_coordinate Vertical Transform from the information in the Coordinate Transform Variable.
* *
* @author caron
*/
public class VAtmHybridSigmaPressure extends AbstractCoordTransBuilder {
private boolean useAp;
private String a, b, ps, p0, ap;
public String getTransformName() {
return "atmosphere_hybrid_sigma_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;
useAp = formula_terms.indexOf("ap:") >= 0;
CoordinateTransform rs = new VerticalCT("AtmHybridSigmaPressure_Transform_"+ctv.getShortName(), getTransformName(), VerticalCT.Type.HybridSigmaPressure, this);
rs.addParameter(new Parameter("standard_name", getTransformName()));
rs.addParameter(new Parameter("formula_terms", formula_terms));
// parse the formula string
if (useAp) {
String[] values = parseFormula(formula_terms, "ap b ps");
if (values == null) return null;
ap = values[0];
b = values[1];
ps = values[2];
rs.addParameter(new Parameter("formula", "pressure(x,y,z) = ap(z) + b(z)*surfacePressure(x,y)"));
if (!addParameter(rs, HybridSigmaPressure.PS, ds, ps)) return null;
if (!addParameter(rs, HybridSigmaPressure.AP, ds, ap)) return null;
if (!addParameter(rs, HybridSigmaPressure.B, ds, b)) return null;
} else {
String[] values = parseFormula(formula_terms, "a b ps p0");
if (values == null) return null;
a = values[0];
b = values[1];
ps = values[2];
p0 = values[3];
rs.addParameter(new Parameter("formula", "pressure(x,y,z) = a(z)*p0 + b(z)*surfacePressure(x,y)"));
if (!addParameter(rs, HybridSigmaPressure.PS, ds, ps)) return null;
if (!addParameter(rs, HybridSigmaPressure.A, ds, a)) return null;
if (!addParameter(rs, HybridSigmaPressure.B, ds, b)) return null;
if (!addParameter(rs, HybridSigmaPressure.P0, ds, p0)) return null;
}
return rs;
}
public String toString() {
return "HybridSigmaPressure:" + (useAp ? "ps:"+ps + " p0:"+p0 + " a:"+a + " b:"+b : "ps:"+ps + " ap:"+ap + " b:"+b);
}
public ucar.unidata.geoloc.vertical.VerticalTransform makeMathTransform(NetcdfDataset ds, Dimension timeDim, VerticalCT vCT) {
return new HybridSigmaPressure(ds, timeDim, vCT.getParameters());
}
}