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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2014 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.dataset.conv;

import ucar.nc2.dataset.CoordSysBuilder;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.NetcdfFile;
import ucar.nc2.Dimension;
import ucar.nc2.Variable;
import ucar.nc2.Attribute;
import ucar.nc2.ncml.NcMLReader;
import ucar.nc2.util.CancelTask;
import ucar.ma2.ArrayDouble;

import java.io.IOException;

/**
 * Created by IntelliJ IDEA.
 * User: yuanho
 * Date: Dec 8, 2009
 * Time: 10:40:47 AM
 * To change this template use File | Settings | File Templates.
 */
public class CEDRICRadarConvention extends CF1Convention {

  /**
   * @param ncfile test this NetcdfFile
   * @return true if we think this is a ATDRadarConvention file.
   */
  public static boolean isMine(NetcdfFile ncfile) {
    // not really sure until we can examine more files
    Dimension s = ncfile.findDimension("cedric_general_scaling_factor");
    Variable v = ncfile.findVariable("cedric_run_date");
    return v != null && s != null;
  }

  public CEDRICRadarConvention() {
    this.conventionName = "CEDRICRadar";
  }
      
  public void augmentDataset(NetcdfDataset ncDataset, CancelTask cancelTask) throws IOException {
  /*  float lat = 40.45f;
    float lon = -104.64f;
    ProjectionImpl projection = new FlatEarth(lat, lon);

    Variable ct = new Variable( ncDataset, null, null, projection.getClassName());
    ct.setDataType( DataType.CHAR);
    ct.setDimensions( "");

    ct.addAttribute( new Attribute("grid_mapping_name", "flat_earth"));
    ct.addAttribute( new Attribute(_Coordinate.TransformType, "Projection"));
    ct.addAttribute( new Attribute(_Coordinate.Axes, "GeoX GeoY"));
    ncDataset.addVariable(null, ct);
  */
        NcMLReader.wrapNcMLresource(ncDataset, CoordSysBuilder.resourcesDir + "CEDRICRadar.ncml", cancelTask);
        Variable lat = ncDataset.findVariable("radar_latitude");
        Variable lon = ncDataset.findVariable("radar_longitude");
        float    latv = (float)lat.readScalarDouble();
        float    lonv = (float)lon.readScalarDouble();
        Variable pv = ncDataset.findVariable("Projection");
        pv.addAttribute(new Attribute("longitude_of_projection_origin", lonv) );
        pv.addAttribute(new Attribute("latitude_of_projection_origin", latv) );

        Variable sdate = ncDataset.findVariable("start_date");
        Variable stime = ncDataset.findVariable("start_time");
        Variable tvar = ncDataset.findVariable("time");
        String dateStr = sdate.readScalarString();
        String timeStr = stime.readScalarString();
        /*Date dt = null;
        try {
          dt = DateUtil.parse(dateStr + " " + timeStr);
        } catch (Exception e) {}  */

        int nt = 1;

        ArrayDouble.D1 data = new ArrayDouble.D1(nt);

        // fake
        data.setDouble(0, 0);
        // data.setDouble(0, dt.getTime()/1000);

        tvar.setCachedData(data, false);

        super.augmentDataset(ncDataset, cancelTask);

   //     System.out.println("here\n");

  //  ncDataset.finish();
  }
}