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template_pixel_xxxx
These IDL facilities provide the index of the template pixel associated with a given
HEALPix pixel, for a resolution parameter
.
FORMAT IDL>
template_pixel_nest, Nside, Pixel_Nest, Template, Reflexion
FORMAT IDL>
template_pixel_ring, Nside, Pixel_Ring, Template, Reflexion
QUALIFIERS
-
Nside
- (IN, scalar) the HEALPix
parameter.
-
Pixel_Nest
- (IN, scalar or vector) NESTED scheme pixel identification number(s) over the range {0,
}.
-
Pixel_Ring
- (IN, scalar or vector) RING scheme pixel identification number(s) over the
range {0,
}.
-
Template
- (OUT, scalar or vector) identification number(s) of the
template matching in shape the pixel(s) provided (the numbering
scheme of the pixel templates is the same for both routines).
-
Reflexion
- (OUT, scalar or vector) in {0, 3} encodes the transformation(s) to
apply to each pixel provided to match exactly in
shape and position its respective template. 0: rotation around the polar axis only,
1: rotation + East-West swap (ie, reflexion around meridian),
2: rotation + North-South swap (ie, reflexion around
Equator), 3: rotation + East-West and North-South swaps
DESCRIPTION
template_pixel_xxxx provide the index of the template pixel associated with a given
HEALPix pixel, for a resolution parameter
.
EXAMPLE:
template_pixel_ring, 256, 500000, template, reflexion
Returns in template the index of the template pixel (16663) whose shape matches
that of the pixel #500000 for
. Upon return reflexion will
contain 2, meaning that the template must be reflected around a meridian and
around the equator (and then rotated around the polar axis) in order to match
the pixel.
RELATED ROUTINESThis section lists the routines related to template_pixel_xxxx
-
nside2templates
- returns the
number of template pixel shapes available for a given
.
-
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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