/*
* 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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* 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.dataset.*;
import ucar.nc2.Variable;
import ucar.nc2.Dimension;
import ucar.unidata.geoloc.vertical.AtmosSigma;
import ucar.unidata.util.Parameter;
/**
* Create a atmosphere_sigma_coordinate Vertical Transform from the information in the Coordinate Transform Variable.
* *
* @author caron
*/
public class VAtmSigma extends AbstractCoordTransBuilder {
private String sigma="", ps="", ptop="";
public String getTransformName() {
return "atmosphere_sigma_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, "sigma ps ptop");
if (values == null) return null;
sigma = values[0];
ps = values[1];
ptop = values[2];
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(x,y,z) = ptop + sigma(z)*(surfacePressure(x,y)-ptop)"));
if (!addParameter( rs, AtmosSigma.PS, ds, ps)) return null;
if (!addParameter( rs, AtmosSigma.SIGMA, ds, sigma)) return null;
if (!addParameter( rs, AtmosSigma.PTOP, ds, ptop)) return null;
return rs;
}
public String toString() {
return "Sigma:" + "sigma:"+sigma + " ps:"+ps + " ptop:"+ptop;
}
public ucar.unidata.geoloc.vertical.VerticalTransform makeMathTransform(NetcdfDataset ds, Dimension timeDim, VerticalCT vCT) {
return new AtmosSigma(ds, timeDim, vCT.getParameters());
}
}