/*
* 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.conv;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.constants.AxisType;
import ucar.nc2.dataset.CoordSysBuilder;
import ucar.nc2.dataset.VariableEnhanced;
import ucar.nc2.util.CancelTask;
import ucar.nc2.Variable;
import ucar.nc2.Attribute;
import ucar.nc2.constants._Coordinate;
import ucar.nc2.units.SimpleUnit;
import java.io.IOException;
import java.util.List;
import java.util.StringTokenizer;
/**
* Unidata Observation Dataset v1.0
* Use CF for new files.
* @see "http://www.unidata.ucar.edu/software/netcdf-java/formats/UnidataObsConvention.html"
* @author caron
*/
public class UnidataObsConvention extends CoordSysBuilder {
public UnidataObsConvention() {
this.conventionName = "Unidata Observation Dataset v1.0";
}
/** create a NetcdfDataset out of this NetcdfFile, adding coordinates etc. */
public void augmentDataset( NetcdfDataset ds, CancelTask cancelTask) throws IOException {
// latitude
if (!hasAxisType( ds, AxisType.Lat)) { // already has _CoordinateAxisType
if ( !addAxisType( ds, "latitude", AxisType.Lat)) { // directly named
String vname = ds.findAttValueIgnoreCase(null, "latitude_coordinate", null);
if (!addAxisType( ds, vname, AxisType.Lat)) { // attribute named
Variable v = hasUnits(ds, "degrees_north,degrees_N,degreesN,degree_north,degree_N,degreeN");
if (v != null)
addAxisType( v, AxisType.Lat); // CF-1
}
}
}
// longitude
if (!hasAxisType( ds, AxisType.Lon)) { // already has _CoordinateAxisType
if ( !addAxisType( ds, "longitude", AxisType.Lon)) { // directly named
String vname = ds.findAttValueIgnoreCase(null, "longitude_coordinate", null);
if (!addAxisType( ds, vname, AxisType.Lon)) { // attribute named
Variable v = hasUnits(ds, "degrees_east,degrees_E,degreesE,degree_east,degree_E,degreeE");
if (v != null)
addAxisType( v, AxisType.Lon); // CF-1
}
}
}
// altitude
if (!hasAxisType(ds, AxisType.Height)) { // already has _CoordinateAxisType
if (!addAxisType(ds, "altitude", AxisType.Height)) { // directly named
if (!addAxisType(ds, "depth", AxisType.Height)) { // directly named
String vname = ds.findAttValueIgnoreCase(null, "altitude_coordinate", null);
if (!addAxisType(ds, vname, AxisType.Height)) { // attribute named
for (int i = 0; i < ds.getVariables().size(); i++) {
VariableEnhanced ve = (VariableEnhanced) ds.getVariables().get( i );
String positive = ds.findAttValueIgnoreCase((Variable) ve, "positive", null);
if (positive != null) {
addAxisType((Variable) ve, AxisType.Height); // CF-1
break;
}
}
}
}
}
}
// time
if (!hasAxisType( ds, AxisType.Time)) { // already has _CoordinateAxisType
if ( !addAxisType( ds, "time", AxisType.Time)) { // directly named
String vname = ds.findAttValueIgnoreCase(null, "time_coordinate", null);
if (!addAxisType( ds, vname, AxisType.Time)) { // attribute named
for (int i = 0; i < ds.getVariables().size(); i++) {
VariableEnhanced ve = (VariableEnhanced) ds.getVariables().get(i);
String unit = ve.getUnitsString();
if (unit == null) continue;
if (SimpleUnit.isDateUnit(unit)) {
addAxisType( (Variable) ve, AxisType.Time); // CF-1
break;
}
}
}
}
}
}
private boolean hasAxisType(NetcdfDataset ds, AxisType a) {
List<Variable> varList = ds.getVariables();
for (Variable v : varList) {
String axisType = ds.findAttValueIgnoreCase(v, "CoordinateAxisType", null);
if ((axisType != null) && axisType.equals(a.toString()))
return true;
}
return false;
}
private Variable hasUnits(NetcdfDataset ds, String unitList) {
List<Variable> varList = ds.getVariables();
StringTokenizer stoker = new StringTokenizer(unitList, ",");
while (stoker.hasMoreTokens()) {
String unit = stoker.nextToken();
for (Variable ve : varList) {
String hasUnit = ve.getUnitsString();
if (hasUnit == null) continue;
if (hasUnit.equalsIgnoreCase(unit))
return ve;
}
}
return null;
}
private boolean addAxisType(NetcdfDataset ds, String vname, AxisType a) {
if (vname == null) return false;
Variable v = ds.findVariable(vname);
if (v == null) return false;
addAxisType( v, a);
return true;
}
private void addAxisType(Variable v, AxisType a) {
v.addAttribute( new Attribute(_Coordinate.AxisType, a.toString()));
}
}