/*
* 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.OceanSigma;
import ucar.unidata.util.Parameter;
/**
* Create a ocean_sigma_coordinate Vertical Transform from the information in the Coordinate Transform Variable.
*
* @author caron
*/
public class VOceanSigma extends AbstractCoordTransBuilder {
private String sigma,eta,depth;
public String getTransformName() {
return "ocean_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;
String[] values = parseFormula(formula_terms, "sigma eta depth");
if (values == null) return null;
sigma = values[0];
eta = values[1];
depth = values[2];
CoordinateTransform rs = new VerticalCT("OceanSigma_Transform_"+ctv.getShortName(), getTransformName(), VerticalCT.Type.OceanSigma, this);
rs.addParameter(new Parameter("standard_name", getTransformName()));
rs.addParameter(new Parameter("formula_terms", formula_terms));
rs.addParameter((new Parameter("height_formula", "height(x,y,z) = eta(n,j,i) + sigma(k)*(depth(j,i)+eta(n,j,i))")));
if (!addParameter(rs, OceanSigma.SIGMA, ds, sigma)) return null;
if (!addParameter(rs, OceanSigma.ETA, ds, eta)) return null;
if (!addParameter(rs, OceanSigma.DEPTH, ds, depth)) return null;
return rs;
}
public String toString() {
return "OceanS:" + " sigma:"+ sigma + " eta:"+eta + " depth:"+depth;
}
public ucar.unidata.geoloc.vertical.VerticalTransform makeMathTransform(NetcdfDataset ds, Dimension timeDim, VerticalCT vCT) {
return new OceanSigma(ds, timeDim, vCT.getParameters());
}
}