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资源说明：Code to match points on the sphere using the healpix scheme
A python code for matching points on the sphere using healpix.
This code is about 5-10 times faster than HTM in the esutil library.
Examples
--------
```python
# For quick matches, use the match() function
import smatch
# This code uses the ring configuration. This means nside can be any positive
# integer between 1 and 2**28=268435456, although beware the memory usage grows
# with nside
nside=4096 # healpix nside
maxmatch=1 # return closest match
# ra,dec,radius in degrees
matches = smatch.match(ra1, dec2, radius, ra2, dec2,
nside=nside, maxmatch=maxmatch)
# in the above call, radius can be a scalar or the
# same size as ra1,dec1
# the output matches structure holds the indices of the matches from each data
# set, and the cosine of the distance between them
print(m.dtype.descr)
[('i1', '
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