Package uk.ac.starlink.ttools.cone
Class HealpixTiling
- java.lang.Object
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- uk.ac.starlink.ttools.cone.HealpixTiling
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Constructor Summary
Constructors Constructor Description HealpixTiling(int k, boolean nest)
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description uk.ac.starlink.table.ValueInfo
getIndexInfo()
Returns a metadata item suitable for describing the pixel index used by this tiling.long
getPixelCount()
Returns the total number of tiles in this tiling.long
getPositionTile(double ra, double dec)
Returns the index of the tile in which a given sky position falls.long[]
getTileRange(double ra, double dec, double radius)
Returns the bounds of a range of pixels which is known to cover a given cone on the sky.
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Method Detail
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getPixelCount
public long getPixelCount()
Description copied from interface:SkyTiling
Returns the total number of tiles in this tiling. Tile indices are assumed to be in the range from zero (inclusive) to this value (exclusive), so the returned value is one greater than the maximum tile index.- Specified by:
getPixelCount
in interfaceSkyTiling
- Returns:
- pixel count
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getIndexInfo
public uk.ac.starlink.table.ValueInfo getIndexInfo()
Description copied from interface:SkyTiling
Returns a metadata item suitable for describing the pixel index used by this tiling.- Specified by:
getIndexInfo
in interfaceSkyTiling
- Returns:
- tile index metadata
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getPositionTile
public long getPositionTile(double ra, double dec)
Description copied from interface:SkyTiling
Returns the index of the tile in which a given sky position falls.- Specified by:
getPositionTile
in interfaceSkyTiling
- Parameters:
ra
- right ascension in degreesdec
- declination in degrees- Returns:
- tile index for position
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getTileRange
public long[] getTileRange(double ra, double dec, double radius)
Description copied from interface:SkyTiling
Returns the bounds of a range of pixels which is known to cover a given cone on the sky. The return value is a two-element array, (lo,hi). Every point in the specified cone must have a tile index which is greater than or equal to the first element of that array, and less than or equal to the second element. If the question cannot be answered, or if the range is thought to be too large to be of use (for instance, if it would take a long time to calculate), thennull
may be returned.- Specified by:
getTileRange
in interfaceSkyTiling
- Parameters:
ra
- right ascension in degreesdec
- declination in degreesradius
- radius in degrees- Returns:
- 2-element array giving inclusive (low, high) bounds of tile range covering the cone
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