Function to provide the number of template pixels

$\begin{displaymath}{N_{\rm templates}}=\frac{1+{N_{\rm side}}({N_{\rm side}}+6)}{4}\end{displaymath}$

corresponding to resolution parameter ${N_{\rm side}}$ . Each template pixel has a different shape that can not be matched (by rotation or reflexion) to that of any of the other templates.

Location in HEALPix directory tree: src/f90/mod/pix_tools.f90

FORMAT

name & dimensionality	kind	in/out	description

nside	I4B	IN	the ${N_{\rm side}}$ parameter.
var	I4B	OUT	the number of template pixels ${N_{\rm templates}}$ .

ntpl= nside2ntemplates(256)

Returns in ntpl the number of HEALPix template pixels (16768) for the resolution parameter 256.

template_pixel_ring
template_pixel_nest: return the template pixel associated with any HEALPix pixel
same_shape_pixels_ring
same_shape_pixels_nest: return the ordered list of pixels having the same shape as a given pixel template

Eric Hivon 2010-06-18

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