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Pixel tiling functions for the celestial sphere.
-
htmIndex( level, ra, dec )
- Gives the HTM (Hierachical Triangular Mesh) pixel index for a given
sky position.
-
healpixNestIndex( k, ra, dec )
- Gives the pixel index for a given sky position in the HEALPix
NEST scheme.
-
healpixRingIndex( k, ra, dec )
- Gives the pixel index for a given sky position in the HEALPix
RING scheme.
-
healpixK( pixelsize )
- Gives the HEALPix resolution parameter suitable for a given pixel size.
This
k
value is the logarithm to base 2 of the
Nside parameter.
-
healpixResolution( k )
- Gives the approximate resolution in degrees for a given HEALPix
resolution parameter
k
This k
value is the logarithm to base 2 of the
Nside parameter.
-
htmLevel( pixelsize )
- Gives the HTM
level
parameter suitable for a given
pixel size.
-
htmResolution( level )
- Gives the approximate resolution in degrees for a given HTM depth level.
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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page:
http://www.starlink.ac.uk/topcat/
Author email:
m.b.taylor@bristol.ac.uk
Mailing list:
topcat-user@bristol.ac.uk