This function calculates an extrapolation field evaluated on grid with multiscale SBF's. It also provides the density of SBF on grid.

1 |

`grid` |
grid points of extrapolation sites in radian |

`site` |
grid points of observation sites in radian |

`coef` |
coefficients of multi-scale SBF's |

`netlab` |
vector of labels representing sub-networks |

`eta` |
bandwidth parameters for Poisson kernel |

`p0` |
(p0+1) will be starting detailed level to be included |

`field` |
extrapolation field |

`density` |
density of SBF |

Oh, H-S. (1999) Spherical wavelets and their statistical analysis with applications to meteorological data. Ph.D. Thesis, Department of Statistics, Texas A\&M University, College Station.

Li, T-H. (1999) Multiscale representation and analysis of spherical data by spherical wavelets.
*SIAM Journal on Scientific Computing*, **21**, 924–953.

Oh, H-S. and Li, T-H. (2004) Estimation of global temperature fields from scattered observations by
a spherical-wavelet-based spatially adaptive method. *Journal of the Royal Statistical Society
Ser.* B, **66**, 221–238.

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