healpy.hotspots¶
- healpy.hotspots(m)¶
Find extrema in the 2-D field on the sphere.
This routine finds the local extrema by comparing each pixel to its 8 (or 7) immediate neighbours. This can be used (for example) to compute a projection of the angular correlation function of the CMB. Applications of this function can be found in WMAP paper (https://arxiv.org/pdf/1001.4538.pdf) as well as recent work done by Planck (https://arxiv.org/pdf/1303.5062.pdf, https://arxiv.org/abs/1506.07135).
- Parameters:
- marray-like, shape (Npix,)
The input map.
- Returns:
- outmaparray-like, shape (Npix,)
Out map of extrema (other pixels are set to UNSEEN)
- min_pixelsarray_like
Pixel number for minima
- max_pixelsarray_like
Pixel number for maxima