Package org.esa.snap.core.dataio.geocoding.util

Class SplineInterpolator

java.lang.Object

org.esa.snap.core.dataio.geocoding.util.SplineInterpolator

public class SplineInterpolator
extends Object

Constructor Summary

Constructors

Constructor	Description
SplineInterpolator()

Method Summary

Modifier and Type	Method	Description
static double	interpolate(double[] x, double[] y, double[] deriv, double x_int)	Calculates a spline interpolation at the location x_int.
static double	interpolate(double[] y, double deriv, double x_int)	Calculates a spline interpolation at the location x_int.
static double	interpolate2d(double[][] data, double x, double y)
static double	interpolate2d(double[] data, double[] derivatives, double x, double y)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SplineInterpolator

public SplineInterpolator()

Method Detail

interpolate

public static double interpolate(double[] y,
                                 double deriv,
                                 double x_int)

Calculates a spline interpolation at the location x_int. Simplified version of Numerical Recipes code, streamlined to process three points. X-locations are assumed to run 0 -> 2

Parameters:

y - vector of y-values

deriv - second derivative at the center point

x_int - x-position to interpolate

Returns:

the interpolated value

interpolate2d

public static double interpolate2d(double[] data,
                                   double[] derivatives,
                                   double x,
                                   double y)

interpolate2d

public static double interpolate2d(double[][] data,
                                   double x,
                                   double y)

interpolate

public static double interpolate(double[] x,
                                 double[] y,
                                 double[] deriv,
                                 double x_int)

Calculates a spline interpolation at the location x_int. Coded from Numerical Recipes.

Parameters:

x - vector of x locations

y - vextor of y-values

deriv - vector of second derivatives at the sampling points

x_int - x-position to interpolate

Returns:

the interpolated value