cds.moc

Interface HealpixImpl

All Known Implementing Classes:

Healpix

public interface HealpixImpl

HEALPix Interface wrapper for Moc usage Encapsulate the usage HEALPix The HEALPix ordering is always NESTED

Method Summary

Modifier and Type	Method and Description
long	ang2pix(int order, double lon, double lat) Provide the HEALPix number associated to a coord, for a given order
double[]	pix2ang(int order, long npix) Provide the galactic coord associated to an HEALPix number, for a given order
long[]	queryDisc(int order, double lon, double lat, double radius) Provide the list of HEALPix numbers fully covering a circle (for a specified order)

Method Detail

ang2pix

long ang2pix(int order,
             double lon,
             double lat)
      throws Exception

Provide the HEALPix number associated to a coord, for a given order

Parameters:

order - HEALPix order [0..MAXORDER]

lon - longitude (expressed in the Healpix frame)

lat - latitude (expressed in the Healpix frame)

Returns:

HEALPix number

Throws:

Exception

pix2ang

double[] pix2ang(int order,
                 long npix)
          throws Exception

Provide the galactic coord associated to an HEALPix number, for a given order

Parameters:

order - HEALPix order [0..MAXORDER]

npix - HEALPix number

Returns:

spherical coord (lon,lat) (expressed in the Healpix frame)

Throws:

Exception

queryDisc

long[] queryDisc(int order,
                 double lon,
                 double lat,
                 double radius)
          throws Exception

Provide the list of HEALPix numbers fully covering a circle (for a specified order)

Parameters:

order - Healpix order

lon - center longitude (expressed in the Healpix frame)

lat - center latitude (expressed in the Healpix frame)

radius - circle radius (in degrees)

Returns:

Throws:

Exception