Maps non-gridded data to a grid based on the coordinates supplied. Cells with no data are NA. For cells with more than one data point, the average is taken.

1 | ```
map.obs.to.grid(n,y.non.grid,coord,lengthx=NULL,lengthy=NULL)
``` |

`y.non.grid` |
Observed data in an T x N matrix with columns and rows corresponding to time and space, respectively. The coordinates of each observation point need to be specified in 'coord'. |

`coord` |
Matrix of dimension N x 2 with coordinates of the N observation points. Based on to these coordinates, each observation location is then mapped to a grid cell. |

`lengthx` |
Use together with 'coord' to specify the length of the x-axis. This is usefull if the observations lie in a rectangular area instead of a square. The length needs to be at least as large as the largest x-distance in 'coord. |

`lengthy` |
Use together with 'coord' to specify the length of the y-axis. This is usefull if the observations lie in a rectangular area instead of a square. The length needs to be at least as large as the largest y-distance in 'coord. |

`n` |
Number of point per axis of the square into which the points are mapped. In total, the process is modeled on a grid of size n*n. |

The function returns data in an T x n^2 matrix with columns and rows corresponding to time and space, respectively. Cells with no data are NA. For cells with more than one data point, the average is taken.

Fabio Sigrist

1 | ```
## See code of 'spate.mcmc'.
``` |

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