/** {@inheritDoc} */
public double calculatePathDelay(final double elevation, final double height) {
// limit the height to 5000 m
final double h = Math.min(Math.max(0, height), 5000);
// limit the elevation to 0 - 180 degree
final double ele = Math.min(180d, Math.max(0d, elevation));
// mirror elevation at the right angle of 90 degree
final double e = ele > 90d ? 180d - ele : ele;
return delayFunction.value(h, e);
}
/**
* Perform a two-dimensional interpolation
*
* @param oldx an IDataset containing a 1D array of X-values, sorted in increasing order,
* corresponding to the first dimension of <code>oldxy</code>
* @param oldy an IDataset containing a 1D array of Y-values, sorted in increasing order,
* corresponding to the second dimension of <code>oldxy</code>
* @param oldxy an IDataset containing a 2D grid of interpolation points
* @param newx an IDataset containing a 1D array of X-values that will be sent to the
* interpolating function
* @param newy an IDataset containing a 1D array of Y-values that will be sent to the
* interpolating function
* @param interpolator an instance of {@link
* org.apache.commons.math3.analysis.interpolation.BivariateGridInterpolator}
* @param output_type an {@link BicubicInterpolationOutput} that will determine how <code>newx
* </code> and <code>newy</code> will be interpreted, and therefore whether a 1D or 2D Dataset
* will be returned.
* @return rank 1 or 2 Dataset, depending on <code>output_type}</code>
* @throws NonMonotonicSequenceException
* @throws NumberIsTooSmallException
*/
public static Dataset interpolate(
IDataset oldx,
IDataset oldy,
IDataset oldxy,
IDataset newx,
IDataset newy,
BivariateGridInterpolator interpolator,
BicubicInterpolationOutput output_type)
throws NonMonotonicSequenceException, NumberIsTooSmallException {
// check shapes
if (oldx.getRank() != 1) throw new IllegalArgumentException("oldx Shape must be 1D");
if (oldy.getRank() != 1) throw new IllegalArgumentException("oldy Shape must be 1D");
if (oldxy.getRank() != 2) throw new IllegalArgumentException("oldxy Shape must be 2D");
if (oldx.getShape()[0] != oldxy.getShape()[0])
throw new IllegalArgumentException("oldx Shape must match oldxy Shape[0]");
if (oldy.getShape()[0] != oldxy.getShape()[1])
throw new IllegalArgumentException("oldy Shape must match oldxy Shape[1]");
if (newx.getRank() != 1) throw new IllegalArgumentException("newx Shape must be 1D");
if (newy.getRank() != 1) throw new IllegalArgumentException("newx Shape must be 1D");
if (output_type == BicubicInterpolationOutput.ONED && newy.getSize() != newx.getSize())
throw new IllegalArgumentException(
"newx and newy Size must be identical when expecting a rank 1 dataset result");
DoubleDataset oldx_dd = (DoubleDataset) DatasetUtils.cast(oldx, Dataset.FLOAT64);
DoubleDataset oldy_dd = (DoubleDataset) DatasetUtils.cast(oldy, Dataset.FLOAT64);
DoubleDataset oldxy_dd = (DoubleDataset) DatasetUtils.cast(oldxy, Dataset.FLOAT64);
// unlike in Interpolation1D, we will not be sorting here, as it just too complicated
// the user will be responsible for ensuring the arrays are properly sorted
// oldxy_dd needs to be transformed into a double[][] array
// this call may throw an exception that needs handling by the calling method
BivariateFunction func =
interpolator.interpolate(
oldx_dd.getData(), oldy_dd.getData(), convertDoubleDataset2DtoPrimitive(oldxy_dd));
Dataset rv = null;
if (output_type == BicubicInterpolationOutput.ONED) {
rv = DatasetFactory.zeros(new int[] {newx.getSize()}, Dataset.FLOAT64);
for (int i = 0; i < newx.getSize(); i++) {
double val = 0.0;
try {
val = func.value(newx.getDouble(i), newy.getDouble(i));
rv.set(val, i);
} catch (OutOfRangeException e) {
rv.set(0.0, i);
}
}
} else if (output_type == BicubicInterpolationOutput.TWOD) {
rv = DatasetFactory.zeros(new int[] {newx.getSize(), newy.getSize()}, Dataset.FLOAT64);
for (int i = 0; i < newx.getSize(); i++) {
for (int j = 0; j < newy.getSize(); j++) {
double val = 0.0;
try {
val = func.value(newx.getDouble(i), newy.getDouble(j));
rv.set(val, i, j);
} catch (OutOfRangeException e) {
rv.set(0.0, i, j);
}
}
}
}
rv.setName(oldxy.getName() + "_interpolated");
return rv;
}