/*
* 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.unidata.geoloc.vertical;
import ucar.nc2.Variable;
import ucar.nc2.NetcdfFile;
import ucar.nc2.Dimension;
import ucar.ma2.*;
import ucar.unidata.util.Parameter;
import java.util.List;
import java.io.IOException;
/**
* Implement CF vertical coordinate "atmosphere_ln_pressure_coordinate"
* pressure(z) = p0 * exp(-lev(k))" .
*
* Theres a problem here, since its not 3D, we dont know what the 2D extent is.
* DO NOT USE: see CF1Convention.makeAtmLnCoordinate()
* @author caron
* @see <a href="http://cf-pcmdi.llnl.gov/">http://cf-pcmdi.llnl.gov/</a>
* @since May 6, 2008
*/
public class AtmosLnPressure extends VerticalTransformImpl {
public static final String P0 = "ReferencePressureVariableName";
public static final String LEV = "VerticalCoordinateVariableName";
private Array pressure;
/**
* Create a new vertical transform for Ocean S coordinates
*
* @param ds dataset
* @param timeDim time dimension
* @param params list of transformation Parameters
*/
public AtmosLnPressure(NetcdfFile ds, Dimension timeDim, List<Parameter> params) {
super(timeDim);
String p0name = getParameterStringValue(params, P0);
Variable p0var = ds.findVariable(p0name);
double p0;
try {
p0 = p0var.readScalarDouble();
} catch (IOException e) {
throw new IllegalArgumentException("AtmosLnPressure failed to read "
+ p0name + " err= " + e.getMessage());
}
String levName = getParameterStringValue(params, LEV);
Variable levVar = ds.findVariable(levName);
try {
Array lev = levVar.read();
assert lev.getRank() == 1;
pressure = new ArrayDouble.D1( (int) lev.getSize());
IndexIterator ii = pressure.getIndexIterator();
while (lev.hasNext()) {
double result = p0 * Math.exp(-lev.nextDouble());
ii.setDoubleNext( result );
}
} catch (IOException e) {
throw new IllegalArgumentException("AtmosLnPressure failed to read "
+ levName + " err= " + e.getMessage());
}
units = p0var.getUnitsString();
}
/**
* Get the 3D vertical coordinate array for this time step.
*
* @param timeIndex the time index. Ignored if !isTimeDependent().
* @return vertical coordinate array
* @throws IOException problem reading data
* @throws ucar.ma2.InvalidRangeException _more_
*/
public ArrayDouble.D3 getCoordinateArray(int timeIndex) throws IOException, InvalidRangeException {
// LOOK! we dont know what size to make this !!
Array ps = null; // readArray(psVar, timeIndex);
Index psIndex = ps.getIndex();
int nz = (int) pressure.getSize();
int[] shape2D = ps.getShape();
int ny = shape2D[0];
int nx = shape2D[1];
ArrayDouble.D3 result = new ArrayDouble.D3(nz, ny, nx);
IndexIterator ii = pressure.getIndexIterator();
for (int z = 0; z < nz; z++) {
double p = ii.getDoubleNext();
for (int y = 0; y < ny; y++) {
for (int x = 0; x < nx; x++) {
result.set(z, y, x, p);
}
}
}
return result;
}
}