Examples of ucar.nc2.dataset.CoordinateAxis

ucar.nc2.dataset.CoordinateAxis
A Coordinate Axis is a Variable that specifies one of the coordinates of a CoordinateSystem. Mathematically it is a scalar function F from index space to S:
```
 F:D -> S where D is a product set of dimensions (aka index space), and S is the set of reals (R) or Strings. 
```
If its element type is char, it is considered a string-valued Coordinate Axis and rank is reduced by one, since the outermost dimension is considered the string length: v(i, j, .., strlen). If its element type is String, it is a string-valued Coordinate Axis. Otherwise it is numeric-valued, and isNumeric() is true.
The one-dimensional case F(i) -> R is the common case which affords important optimizations. In that case, use the subtype CoordinateAxis1D. The factory methods will return either a CoordinateAxis1D if the variable is one-dimensional, a CoordinateAxis2D if its 2D, or a CoordinateAxis for the general case.
A CoordinateAxis is optionally marked as georeferencing with an AxisType. It should have a units string and optionally a description string.
A Structure cannot be a CoordinateAxis, although members of Structures can. @author john caron

    if (null == axis) throw new IllegalArgumentException("There is no time coordinate");
    return readValue( axis, fromVar, index);
  }


  public double readGeoXCoord(Variable fromVar, int[] index) throws IOException, InvalidRangeException {
    CoordinateAxis axis = cs.getXaxis();
    if (null == axis) throw new IllegalArgumentException("There is no GeoX coordinate");
    return readValue( axis, fromVar, index);
  }

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    if (null == axis) throw new IllegalArgumentException("There is no GeoX coordinate");
    return readValue( axis, fromVar, index);
  }


  public double readGeoYCoord(Variable fromVar, int[] index) throws IOException, InvalidRangeException {
    CoordinateAxis axis = cs.getYaxis();
    if (null == axis) throw new IllegalArgumentException("There is no GeoY coordinate");
    return readValue( axis, fromVar, index);
  }

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    if (null == axis) throw new IllegalArgumentException("There is no GeoY coordinate");
    return readValue( axis, fromVar, index);
  }


  public double readGeoZCoord(Variable fromVar, int[] index) throws IOException, InvalidRangeException {
    CoordinateAxis axis = cs.getZaxis();
    if (null == axis) throw new IllegalArgumentException("There is no GeoZ coordinate");
    return readValue( axis, fromVar, index);
  }

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   * @param ds look in this dataset's "Best" coordinate system.
   * @param atype look for this type of CoordinateAxis. takes the first one it finds.
    * @return the found CoordinateAxis name, or null if none
   */
   static public String findCoordNameByType(NetcdfDataset ds, AxisType atype) {
     CoordinateAxis coordAxis = findCoordByType(ds, atype);
     return coordAxis == null ? null : coordAxis.getFullName();
   }

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     CoordinateAxis coordAxis = findCoordByType(ds, atype);
     return coordAxis == null ? null : coordAxis.getFullName();
   }


  static public String findCoordShortNameByType(NetcdfDataset ds, AxisType atype) {
    CoordinateAxis coordAxis = findCoordByType(ds, atype);
    return coordAxis == null ? null : coordAxis.getShortName();
  }

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   * @param ds look in this dataset's "Best" coordinate system.
   * @param atype look for this type of CoordinateAxis. takes the first one it finds.
   * @return the found CoordinateAxis' first Dimension, or null if none or scalar
   */
  static public Dimension findDimensionByType(NetcdfDataset ds, AxisType atype) {
    CoordinateAxis axis = findCoordByType(ds, atype);
    if (axis == null) return null;
    if (axis.isScalar()) return null;
    return axis.getDimension(0);
  }

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    Variable latVar = null, timeVar = null;


    // identify key variables
    List axes = ds.getCoordinateAxes();
    for (int i = 0; i < axes.size(); i++) {
      CoordinateAxis axis = (CoordinateAxis) axes.get(i);
      if (axis.getAxisType() == AxisType.Lat)
        latVar = axis;
      if (axis.getAxisType() == AxisType.Time)
        timeVar = axis;
    }


    // lat, lon are always in the outer; gotta use name to fetch wrapping variable
    Structure outerSequence = getWrappingParent(ds, latVar);

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    super(ds);


    // identify key variables
    List axes = ds.getCoordinateAxes();
    for (int i = 0; i < axes.size(); i++) {
      CoordinateAxis axis = (CoordinateAxis) axes.get(i);
      if (axis.getAxisType() == AxisType.Lat)
        latVar = axis;
      if (axis.getAxisType() == AxisType.Lon)
        lonVar = axis;
      if (axis.getAxisType() == AxisType.Height)
        altVar = axis;
      if (axis.getAxisType() == AxisType.Time)
        timeVar = axis;
    }


    if (latVar == null) {
      parseInfo.append("Missing latitude variable");

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    if (var == null) return null;
    return var.getShortName();
  }


  protected CoordinateAxis findZAxisNotStationAlt(NetcdfDataset ds) {
    CoordinateAxis z = CoordSysEvaluator.findCoordByType(ds, AxisType.Height, new CoordSysEvaluator.Predicate() {
      public boolean match(CoordinateAxis axis) {
        Attribute stdName = axis.findAttribute(CF.STANDARD_NAME);
        return ((stdName == null) || !CF.STATION_ALTITUDE.equals(stdName.getStringValue()));
      }
    });

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  public static void test1() throws IOException {
    String filename = "D:/work/asaScience/EGM200_3.ncml";
    GridDataset gds = GridDataset.open(filename);
    GeoGrid grid = gds.findGridByName("u_wind");
    GridCoordSystem gcs = grid.getCoordinateSystem();
    CoordinateAxis lonAxis = gcs.getXHorizAxis();
    assert lonAxis instanceof CoordinateAxis2D;
    CoordinateAxis latAxis = gcs.getYHorizAxis();
    assert latAxis instanceof CoordinateAxis2D;


    GridCoordinate2D g2d = new GridCoordinate2D((CoordinateAxis2D) latAxis, (CoordinateAxis2D) lonAxis);
    doOne(g2d, 35.0, -6.0);
    doOne(g2d, 34.667302, -5.008376); // FAIL

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