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Since some modules (e.g., healpix.py) under "utils" involves Numba JIT
optimization, which significantly slows the start-up speed, even some
consumers (e.g., bin/fg21sim-webui) do not need them at all.
Fix various import statements of other modules.
NOTE: not test at the moment!
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The "zea2healpix()" function reprojects the maps in ZEA
(zenithal/azithumal equal area) projection to HEALPix data in Galactic
frame with RING ordering.
The other two helper functions "_image_to_healpix()" and "_convert_wcs()"
are almost copied from the "reproject" project [1]. Thanks!
TODO:
* Add some more logging
* Implement the "inpaint" argument to inpaint the HEALPix map if exists
missing pixels
[1] reproject: https://github.com/astrofrog/reproject
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This function wraps on the `healpy.read_map()`, but reset the data array
to its original dtype in FITS file, as well as return the FITS header in
`astropy.io.fits.Header` object.
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NOTE:
This "write_fits_healpix()" function only implements the most common
case of the HEALPix FITS style.
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This "setup_logging()" utility can setup the logging module with the
given configuration dict, and can also update the logging configs by
specify the additional parameters.
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* healpix2hpx: reorganize HEALPix data in HPX projection
* hpx2healpix: recover the HEALPix data from HPX projection
Thanks: M. Calabretta: WCSLIB: HPXcvt
TODO: Add test codes
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