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Semi-Lagrangian advection is a key part of efficient spectral atmospheric models.
In ECMWF’s model, it allows for [6x large time-steps](https://www.ecmwf.int/sites/default/files/elibrary/2014/9054-…
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- get stars from multiple nside 4096 pixels rather than 256 (smaller area -> more computationally feasible)
- randomize positions so that the stellar density is homogeneous (density varies by healpix…
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1. If I understand correctly, a00, a01, a10, a11 in your example stand for alphax_x, alphax_y, alphay_x, alphay_y. Is it right? Thus:
* kappa = (a00+a11)/2
* shear1 = (a00-a11)/2
* …
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@astrofrog – How about a tutorial IPython notebook on reproject to make it easier for people to find it and try it out?
I could take the main examples from http://reproject.readthedocs.org/en/latest/…
cdeil updated
9 years ago
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I'd like to do a distributed coordinate system transformation in alm space with `libsharp`, the equivalent of the HEALPix `rotate_alm` functionality, is there a way to do it?
If it is not exposed to …
zonca updated
5 years ago
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Would you want any additional testing of the code in order to mark the pg_healpix SQL functions as PARALLEL SAFE (similar to the discussion in item #32 for q3c), or is the code simple enough it would …
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Attempting to build `snex2` on bare metal (from the branch `feature/add_hermes_tns_sharing`) succeeds but running throws the following error:
```
Traceback (most recent call last):
File "/Users…
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At the minute the positions of bright stars are only plotted in the camera images. Write code to put them in the sky fov maps.
- [x] Run low mag limit polaris field with reduced fov, but same healp…
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**Bug report**
I saw a new warning this morning, when trying out a DP0 import:
```
/astro/users/mmd11/git/hipscat-import/src/hipscat_import/catalog/map_reduce.py:289: PerformanceWarning: DataFr…
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We might need to improve the efficiency of FoF matching. @sschmidt23 suggested this obvious speedup: for each tract, only load the overlapping healpix pixels, and save the match 1:1, 2:1, and 3:1 matc…