Package cds.healpix

Interface Interpolator

All Superinterfaces:
HierarchyItem

public interface Interpolator extends HierarchyItem
Interface use for interpolation, i.e. to compute a value (an image pixel for example) from the values of HEALPix cells.
Author:
F.-X. Pineau
  • Method Summary

    Modifier and Type
    Method
    Description
    int
    interpolate(double lon, double lat, long[] resultHashs, double[] resultWeights)
    From a position on the sky, returns a list of HEALPix cells and associated weights typically depending on the distances between the position and the cell centers.

    Methods inherited from interface cds.healpix.HierarchyItem

    depth
  • Method Details

    • interpolate

      int interpolate(double lon, double lat, long[] resultHashs, double[] resultWeights)
      From a position on the sky, returns a list of HEALPix cells and associated weights typically depending on the distances between the position and the cell centers.
      Parameters:
      lon - longitude in radians, must support reasonably large positive and negative values producing accurate results with a naive range reduction like modulo 2*pi (i.e. without having to resort on Cody-Waite or Payne Hanek range reduction).
      lat - latitude in [-pi/2, pi/2] radians
      resultHashs - array used to store the list of hash to be used for the interpolation
      resultWeights - array used to store the weights associated with each hash
      Returns:
      the number of elements to be read in the results arrays