SubgridMoransI | R Documentation |

Functions that facilitate calculation of statistics at the sub-grid level.
These may be useful for drivers of movement speed or direction if used in
tandem with `DispField`

, `DispFieldST`

, or
`DispFieldSTall`

.

SubgridMoransI(inputrast1, factv1, facth1, rad1 = 1) SubgridStats(inputrast1, factv1, facth1, statistic = "var")

`inputrast1` |
a raster as produced by terra::rast |

`factv1` |
an odd integer for the vertical dimension of sub-grids |

`facth1` |
an odd integer for the horizontal dimension of sub-grids |

`rad1` |
an integer indicating the neighbourhood radius for Moran's I statistic calculations in rows/columns. Any cell within a distance of rad1 cells of the focal cell is considered to be in its neighbourhood. |

`statistic` |
desired output statistic: It should be one of "mean", "var", or "sum". Default setting is var. |

Note that when using radius to define the neighbourhood in Moran's I calculations, a radius of one corresponds to the rook's neibhourhood. Values that are NA or Inf are not included in calculations of the Moran's I statistic nor in any of the other statistics that can be computed.

A data frame is returned with the following column names: rowcent, colcent, frowmin, frowmax, fcolmin, fcolmax, and a column for the output statistic.

`DispStats`

and `DispMoransI`

for functions
that compute statistics at presumed source or sink locations in each region
of interest.

(TestMat <- matrix(c(1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1), nrow = 5)) TestRast <- terra::rast(TestMat) terra::plot(TestRast) SubgridMoransI(TestRast, factv1 = 5, facth1 = 5, rad1 = 1) # using rad1 = 1 is equivalent to using the rooks neighbourhood # and so the output should be -1. (TestMat <- matrix(c(1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1), nrow = 5)) TestRast <- terra::rast(TestMat) terra::plot(TestRast) SubgridStats(TestRast, factv1 = 5, facth1 = 5, statistic = "mean") SubgridStats(TestRast, factv1 = 5, facth1 = 5, statistic = "var") SubgridStats(TestRast, factv1 = 5, facth1 = 5, statistic = "sum")

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