Calculation of an Extrapolation Field with Multiscale SBF's

This function decides the number of multi-resolution levels by G\"ottlemann's method, modified G\"ottlemann's method or standard method.

1 2 3 | ```
modnetlevel(angle) # for modified G\"{o}ttlemann's grid
gotnetlevel(angle) # for G\"{o}ttlemann's grid
netlevel(angle) # for standard grid
``` |

`angle` |
radius (geodesic distance) from locations of data within a territory to the center point of the territory |

`nlevel` |
the number of multi-resolution levels. |

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.

1 2 3 | ```
modnetlevel(3 * pi/180) # for modified G\"{o}ttlemann's grid
gotnetlevel(2 * pi/180) # for G\"{o}ttlemann's grid
netlevel(5 * pi/180) # for standard grid
``` |

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