surveys.py 文件源码

def _set_altaz_fields(self, leafsize=10):
        """
        Have a fixed grid of alt,az pointings to use
        """
        tmp = read_fields()
        names = ['alt', 'az']
        types = [float, float]
        self.fields = np.zeros(tmp.size, dtype=list(zip(names, types)))
        self.fields['alt'] = tmp['dec']
        self.fields['az'] = tmp['RA']

        x, y, z = treexyz(self.fields['az'], self.fields['alt'])
        self.field_tree = kdtree(list(zip(x, y, z)), leafsize=leafsize,
                                 balanced_tree=False, compact_nodes=False)
        hpids = np.arange(hp.nside2npix(self.nside))
        self.reward_ra, self.reward_dec = _hpid2RaDec(self.nside, hpids)