Description Usage Arguments Details Value See Also Examples

Take a stratified random sample from the cell values of a Raster* object (without replacement). An attempt is made to sample `size`

cells from each stratum. The values in the RasterLayer `x`

are rounded to integers; with each value representing a stratum.

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`x` |
Raster* object, with values (rounded to integers) representing strata |

`size` |
positive integer giving the number of items to choose |

`exp` |
numeric >= 1. 'Expansion factor' that is multiplied with size to get an intial sample. Can be increased when you get an insufficient number of samples for small strata |

`na.rm` |
logical. If |

`xy` |
logical. Return coordinates of cells rather than cell numbers |

`ext` |
Extent object. To limit regular sampling to the area within the extent |

`sp` |
logical. If |

`...` |
Additional arguments. None implemented |

The function may not work well when the size (number of cells) of some strata is relatively small.

matrix of cell numbers (and optionally coordinates) by stratum

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