healpix_fits_file_sampler¶
- toasty.samplers.healpix_fits_file_sampler(path, extension=None, interpolation='nearest', force_galactic=False)[source]¶
Create a sampler for HEALPix data read from a FITS file.
- Parameters:
- pathstring
The path to the FITS file.
- extensioninteger or None (default: None)
Which extension in the FITS file to read. If not specified, the first extension with PIXTYPE = “HEALPIX” will be used.
- interpolation‘nearest’ | ‘bilinear’
What interpolation scheme to use.
WARNING: bilinear uses healpy’s get_interp_val, which seems prone to segfaults
- force_galacticbool
If true, force use of Galactic coordinate system, regardless of what the headers say.
- Returns:
- A function that samples the HEALPix image; the call signature is
vec2pix(lon, lat) -> data, where the inputs and output are 2D arrays- and lon and lat are in radians.
