/*
* 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.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.nc2.dt.point;
import ucar.nc2.*;
import ucar.nc2.units.DateUnit;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.constants.AxisType;
import ucar.nc2.constants._Coordinate;
import ucar.ma2.DataType;
import ucar.unidata.geoloc.LatLonRect;
import ucar.unidata.geoloc.LatLonPointImpl;
import java.util.List;
import java.util.Date;
/**
* Helper routines for station/point datasets
*
* @author caron
*/
public class UnidataObsDatasetHelper {
static public Date getStartDate(NetcdfDataset ds) {
Attribute att = ds.findGlobalAttributeIgnoreCase("time_coverage_start");
if (null == att)
throw new IllegalArgumentException("Must have a time_coverage_start global attribute");
if (att.getDataType() == DataType.STRING) {
return DateUnit.getStandardOrISO( att.getStringValue());
} else {
throw new IllegalArgumentException("time_coverage_start must be a ISO or udunit date string");
}
}
static public Date getEndDate(NetcdfDataset ds) {
Attribute att = ds.findGlobalAttributeIgnoreCase("time_coverage_end");
if (null == att)
throw new IllegalArgumentException("Must have a time_coverage_end global attribute");
Date result;
if (att.getDataType() == DataType.STRING) {
result = DateUnit.getStandardOrISO( att.getStringValue());
} else {
throw new IllegalArgumentException("time_coverage_end must be a ISO or udunit date string");
}
return result;
}
static public LatLonRect getBoundingBox(NetcdfDataset ds) {
double lat_max = getAttAsDouble( ds, "geospatial_lat_max");
double lat_min = getAttAsDouble( ds, "geospatial_lat_min");
double lon_max = getAttAsDouble( ds, "geospatial_lon_max");
double lon_min = getAttAsDouble( ds, "geospatial_lon_min");
return new LatLonRect(new LatLonPointImpl(lat_min, lon_min), lat_max-lat_min, lon_max-lon_min);
}
static private double getAttAsDouble( NetcdfDataset ds, String attname) {
Attribute att = ds.findGlobalAttributeIgnoreCase(attname);
if (null == att)
throw new IllegalArgumentException("Must have a "+attname+" global attribute");
if (att.getDataType() == DataType.STRING) {
return Double.parseDouble( att.getStringValue());
} else {
return att.getNumericValue().doubleValue();
}
}
/**
* Tries to find the coordinate variable of the specified type.
* @param ds look in this dataset
* @param a AxisType.LAT, LON, HEIGHT, or TIME
* @return coordinate variable, or null if not found.
*/
static public Variable getCoordinate(NetcdfDataset ds, AxisType a) {
List<Variable> varList = ds.getVariables();
for (Variable v : varList) {
if (v instanceof Structure) {
//System.out.println( "v is a Structure" );
List<Variable> vars = ((Structure) v).getVariables();
for (Variable vs : vars) {
//System.out.println( "vs =" + vs.getShortName() );
String axisType = ds.findAttValueIgnoreCase(vs, _Coordinate.AxisType, null);
if ((axisType != null) && axisType.equals(a.toString()))
return vs;
}
} else {
String axisType = ds.findAttValueIgnoreCase(v, _Coordinate.AxisType, null);
if ((axisType != null) && axisType.equals(a.toString()))
return v;
}
}
if (a == AxisType.Lat)
return findVariable( ds, "latitude");
if (a == AxisType.Lon)
return findVariable( ds, "longitude");
if (a == AxisType.Time)
return findVariable( ds, "time");
if (a == AxisType.Height) {
Variable v = findVariable( ds, "altitude");
if (null == v) v = findVariable( ds, "depth");
return v;
}
// I think the CF part is done by the CoordSysBuilder adding the _CoordinateAxisType attrinutes.
return null;
}
static public Variable findVariable(NetcdfFile ds, String name) {
Variable result = ds.findVariable(name);
if (result == null) {
String aname = ds.findAttValueIgnoreCase(null, name+"_coordinate", null);
if (aname != null)
result = ds.findVariable(aname);
else {
aname = ds.findAttValueIgnoreCase(null, name+"_variable", null);
if (aname != null)
result = ds.findVariable(aname);
}
}
return result;
}
static public Dimension findDimension(NetcdfFile ds, String name) {
Dimension result = ds.findDimension(name);
if (result == null) {
String aname = ds.findAttValueIgnoreCase(null, name+"Dimension", null);
if (aname != null)
result = ds.findDimension(aname);
}
return result;
}
}