Examples of ucar.nc2.Structure

ucar.nc2.constants.AxisType
A Structure is a type of Variable that contains other Variables, like a struct in C. A Structure can be scalar or multidimensional.
A call to structure.read() will read all of the data in a Structure, including nested structures, and returns an Array of StructureData, with all of the data in memory. If there is a nested sequence, the sequence data may be read into memory all at once, ot it may be read in increments as the iteration proceeds.
Generally, the programmer can assume that the data in one Structure are stored together, so that it is efficient to read an entire Structure, and then access the Variable data through the Arrays in the StructureData. @author caron

    }


  }


  private boolean setAxisType(NetcdfDataset ds, String varName, AxisType atype) {
    Variable v = ds.findVariable(varName);
    if (v == null) return false;


    v.addAttribute(new Attribute(_Coordinate.AxisType, atype.toString()));
    return true;
  }

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        List<Dimension> dims = new ArrayList<Dimension>();
        dims.add( scanDim);
        dims.add( radialDim);
        dims.add( gateDim);


        Variable v = new Variable(ncfile, null, null, shortName+abbrev);
        v.setDataType(DataType.SHORT);
        v.setDimensions(dims);
        ncfile.addVariable(null, v);


        v.addAttribute( new Attribute("units", firstRay.getDatatypeUnits(abbrev)));
        v.addAttribute( new Attribute("long_name", longName));
        v.addAttribute( new Attribute("abbrev", abbrev));
        v.addAttribute( new Attribute("missing_value", firstRay.getMissingData()));
        v.addAttribute( new Attribute("signal_below_threshold", firstRay.getDatatypeRangeFoldingThreshhold(abbrev)));
        v.addAttribute( new Attribute("scale_factor", firstRay.getDatatypeScaleFactor(abbrev)));
        v.addAttribute( new Attribute("add_offset", firstRay.getDatatypeAddOffset(abbrev)));
       // v.addAttribute( new Attribute("_Unsigned", "false"));


        v.addAttribute( new Attribute("range_folding_threshold" ,firstRay.getDatatypeRangeFoldingThreshhold(abbrev)));


        List<Dimension> dim2 = new ArrayList<Dimension>();
        dim2.add( scanDim);
        dim2.add( radialDim);


        // add time coordinate variable
        String timeCoordName = "time"+abbrev;
        Variable timeVar = new Variable(ncfile, null, null, timeCoordName);
        timeVar.setDataType(DataType.INT);
        timeVar.setDimensions(dim2);
        ncfile.addVariable(null, timeVar);




        // int julianDays = volScan.getTitleJulianDays();
        // Date d = Level2Record.getDate( julianDays, 0);
        Date d = firstRay.getDate();
        String units = "msecs since "+formatter.toDateTimeStringISO(d);


        timeVar.addAttribute( new Attribute("long_name", "time since base date"));
        timeVar.addAttribute( new Attribute("units", units));
        timeVar.addAttribute( new Attribute("missing_value", firstRay.getMissingData()));
        timeVar.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.Time.toString()));


        // add elevation coordinate variable
        String elevCoordName = "elevation"+abbrev;
        Variable elevVar = new Variable(ncfile, null, null, elevCoordName);
        elevVar.setDataType(DataType.FLOAT);
        elevVar.setDimensions(dim2);
        ncfile.addVariable(null, elevVar);


        elevVar.addAttribute( new Attribute("units", "degrees"));
        elevVar.addAttribute( new Attribute("long_name", "elevation angle in degres: 0 = parallel to pedestal base, 90 = perpendicular"));
        elevVar.addAttribute( new Attribute("missing_value", firstRay.getMissingData()));
        elevVar.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.RadialElevation.toString()));


        // add azimuth coordinate variable
        String aziCoordName = "azimuth"+abbrev;
        Variable aziVar = new Variable(ncfile, null, null, aziCoordName);
        aziVar.setDataType(DataType.FLOAT);
        aziVar.setDimensions(dim2);
        ncfile.addVariable(null, aziVar);


        aziVar.addAttribute( new Attribute("units", "degrees"));
        aziVar.addAttribute( new Attribute("long_name", "azimuth angle in degrees: 0 = true north, 90 = east"));
        aziVar.addAttribute( new Attribute("missing_value", firstRay.getMissingData()));
        aziVar.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.RadialAzimuth.toString()));


        // add gate coordinate variable
        String gateCoordName = "distance"+abbrev;
        Variable gateVar = new Variable(ncfile, null, null, gateCoordName);
        gateVar.setDataType(DataType.FLOAT);
        gateVar.setDimensions(gateDimName);
        Array data = Array.makeArray( DataType.FLOAT, ngates,
            (double) firstRay.getGateStart(abbrev), (double) firstRay.getGateSize(abbrev));
        gateVar.setCachedData( data, false);
        ncfile.addVariable(null, gateVar);
  //      radarRadius = firstRay.getGateStart(datatype) + ngates * firstRay.getGateSize(datatype);


        gateVar.addAttribute( new Attribute("units", "m"));
        gateVar.addAttribute( new Attribute("long_name", "radial distance to start of gate"));
        gateVar.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.RadialDistance.toString()));


        // add number of radials variable
        String nradialsName = "numRadials"+abbrev;
        Variable nradialsVar = new Variable(ncfile, null, null, nradialsName);
        nradialsVar.setDataType(DataType.INT);
        nradialsVar.setDimensions(scanDim.getName());
        nradialsVar.addAttribute( new Attribute("long_name", "number of valid radials in this scan"));
        ncfile.addVariable(null, nradialsVar);


        // add number of gates variable
        String ngateName = "numGates"+abbrev;
        Variable ngateVar = new Variable(ncfile, null, null, ngateName);
        ngateVar.setDataType(DataType.INT);
        ngateVar.setDimensions(scanDim.getName());
        ngateVar.addAttribute( new Attribute("long_name", "number of valid gates in this scan"));
        ncfile.addVariable(null, ngateVar);


        makeCoordinateDataWithMissing(abbrev, timeVar, elevVar, aziVar, nradialsVar, ngateVar, groups);


        // back to the data variable

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  public void problemV() throws IOException {
    H5header.setDebugFlags(new ucar.nc2.util.DebugFlagsImpl("H5header/header"));
    String filename = testDir + "ssec-h5/MYD04_L2.A2006188.1830.005.2006194121515.hdf";
    NetcdfFile ncfile = NetcdfFile.open(filename);
    Variable v = ncfile.findVariable("/U-MARF/EPS/IASI_xxx_1C/DATA/SPECT_LAT_ARRAY");
    Array data = v.read();
    System.out.println("\n**** testReadNetcdf4 done\n\n" + ncfile);
    NCdump.printArray(data, "primary_cloud", System.out, null);
    ncfile.close();
  }

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    super.findCoordinateAxes(ds);
  }


  protected AxisType getAxisType( NetcdfDataset ncd, VariableEnhanced v) {


    AxisType atype = super.getAxisType(ncd, v);
    if (atype != null) return atype;


    String unit = v.getUnitsString();
    if (unit == null)
      return null;

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    int count = 0;
    while (stoker.hasMoreTokens()) {
      String vname = stoker.nextToken();
      Variable v = ds.findVariable(vname);
      if (v != null) {
        AxisType atype = count == 0 ? AxisType.Lat : count == 1 ? AxisType.Lon : AxisType.Height;
        v.addAttribute(new Attribute(_Coordinate.AxisType, atype.toString()));
      } else {
        parseInfo.format(" cant find time variable %s\n",vname);
      }
      count++;
    }

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    if (positive != null) {
      v.addAttribute(new Attribute("positive", positive));
    }


    if (units != null) {
      AxisType axisType;
      if (SimpleUnit.isCompatible("millibar", units)) {
        axisType = AxisType.Pressure;
      } else if (SimpleUnit.isCompatible("m", units)) {
        axisType = AxisType.Height;
      } else {
        axisType = AxisType.GeoZ;
      }


      if (lookup instanceof Grib2GridTableLookup || lookup instanceof Grib1GridTableLookup) {
        v.addAttribute(new Attribute("GRIB_level_type", Integer.toString(typicalRecord.getLevelType1())));
      } else {
        v.addAttribute(new Attribute("level_type", Integer.toString(typicalRecord.getLevelType1())));
      }
      v.addAttribute(new Attribute(_Coordinate.AxisType, axisType.toString()));
    }


    if (coordValues == null) {
      coordValues = new double[levels.size()];
      for (int i = 0; i < levels.size(); i++) {

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      HashMap<AxisType, VarProcess> map = new HashMap<AxisType, VarProcess>();


      // find existing axes, so we dont duplicate
      for (VarProcess vp : varList) {
        if (vp.isCoordinateAxis) {
          AxisType atype = getAxisType(ds, (VariableEnhanced) vp.v);
          if (atype != null)
            map.put(atype, vp);
        }
      }


      // look for time axes based on units
      if (map.get(AxisType.Time) == null) {
        for (VarProcess vp : varList) {
          Variable ncvar = vp.v;
          if (!(ncvar instanceof VariableDS)) continue; // cant be a structure
          String unit = ncvar.getUnitsString();


          if (SimpleUnit.isDateUnit(unit)) {
            vp.isCoordinateAxis = true;
            map.put(AxisType.Time, vp);
            parseInfo.format(" Time Coordinate Axis added (unit) = %s from unit %s\n", vp.v.getFullName(), unit);
            //break; // allow multiple time coords
          }
        }
      }


      // look for missing axes by using name hueristics
      for (VarProcess vp : varList) {
        if (vp.isCoordinateVariable) continue;
        Variable ncvar = vp.v;
        if (!(ncvar instanceof VariableDS)) continue; // cant be a structure


        AxisType atype = getAxisType(ds, (VariableEnhanced) vp.v);
        if (atype != null) {
          if (map.get(atype) == null) {
            vp.isCoordinateAxis = true;
            parseInfo.format(" Coordinate Axis added (Default forced) = %s for axis %s\n", vp.v.getFullName(), atype);
            map.put(atype, vp);

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      }
      super.makeCoordinateTransforms(ds);
    }


    protected AxisType getAxisType(NetcdfDataset ds, VariableEnhanced ve) {
      AxisType result = getAxisTypeCoards(ds, ve);
      if (result != null) return result;


      Variable v = (Variable) ve;
      String vname = v.getShortName();
      String unit = v.getUnitsString();

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    if (positive != null) {
      v.addAttribute(new Attribute("positive", positive));
    }


    if (units != null) {
      AxisType axisType;
      if (SimpleUnit.isCompatible("millibar", units)) {
        axisType = AxisType.Pressure;
      } else if (SimpleUnit.isCompatible("m", units)) {
        axisType = AxisType.Height;
      } else {
        axisType = AxisType.GeoZ;
      }


      v.addAttribute(
              new Attribute(
                      "grid_level_type",
                      Integer.toString(record.getLevelType1())));


      v.addAttribute(new Attribute(_Coordinate.AxisType,
              axisType.toString()));
      v.addAttribute(new Attribute(_Coordinate.Axes, dims));
      if (!hcs.isLatLon()) {
        v.addAttribute(new Attribute(_Coordinate.Transforms,
                hcs.getGridName()));
      }

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    if (coordinates != null) {
      String[] vars = coordinates.split(" ");
      for (String vname : vars) {
        Variable v = ds.findVariable(vname);
        if (v != null) {
          AxisType atype = getAxisType(ds, (VariableEnhanced) v);
          if (atype != null)
            v.addAttribute(new Attribute(_Coordinate.AxisType, atype.name()));
        }
      }
    }


  }

View Full Code Here

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