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We will soon be producing a lot of data on a HEALPix (Hierarchical Equal Area isoLatitude Pixelation) grid. The grid coordinates can be calculated easily from 2 parameters. The NSIDE parameter control…
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The step of going to a Healpix grid before converting to `a_lm` should probably be avoided for accuracy reasons. The original `beam2alm` code did actually produce a Healpix map, but it was only used f…
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The longitude selection criteria can't properly handle the periodic longitudinal boundary conditions. The example below shows (an unlikely) case where the FoV is set so large that it overlaps with th…
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The current API is based on Gaia defaults which are not obvious outside Gaia:
```healpix_expression='source_id/34359738368', ... nest=True, ...```
These are not the defaults in healpy. Healpy by d…
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Library name: **HEALPix**
New version number: **3.82**
Other information that may be useful (release notes, etc...)
https://healpix.sourceforge.io/
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https://en.wikipedia.org/wiki/HEALPix
Useful specification for 2-d histogram on the sphere, used widely for astrophysics and cosmology.
Example C++ implementation
https://sourceforge.net/proje…
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I am wondering if some convenience code or doc example of how to go from the healpix range sets to a MOC might be useful.
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My understanding is that the spectra are grouped by healpix pixels. There is no column for the HEALPix label.
The same object can have different targetid's for different PROGRAMs. These can be as…
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I think the current plan for DES is to use the Oracle database as the primary repository for healpix maps. In order to facilitate user access to these maps, I think we want to provide a set of `upload…