indexes: Variability Indexes
In iesiee/PVF: Forecast of Power and Ramps Produced by Grid-Connected PV Systems

Description Usage Arguments Details Value Author(s) References See Also

Spatial and time variability indexes.

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idwNear(surround, point, nmax, ...)
terrainIndex(surround, point)
tempIndex(runVals)

`surround`	A `Raster` object. It includes the location defined by `point`.
`point`	A `SpatialPoints*` object, the location of interest.
`nmax`	the number of nearest observations that should be used for the interpolation.
`runVals`	A `zoo` object, a time series, produced by `getPointRuns`
`...`	Additional arguments for `idw`

idwNear produces a deterministic interpolation at point with the values of surround.

terrainIndex computes three spatial variability indexes: TRI, PI, and roughness. Terrain Ruggedness Index is defined as the mean of the absolute differences between a central cell and its surrounding 8 cells in a 3 by 3 grid. Topographic Position Index, is defined as the difference between a central cell and the mean of its surrounding 8 cells in a 3 by 3 grid. Roughness is the largest inter-cell difference of a central cell and its surrounding 8 cells in a 3 by 3 grid. The results are normalized with the value at point.

tempIndex is a simple function that calculates the standard deviation by rows.

A data.frame

Marcelo Pinho Almeida and Oscar Perpiñán Lamigueiro

Wilson, M. F., O’Connell, B., Brown, C., Guinan, J. C., & Grehan, A. J. (2007). Multiscale terrain analysis of multibeam bathymetry data for habitat mapping on the continental slope. Marine Geodesy, 30(1-2), 3-35.

idw, terrain

iesiee/PVF documentation built on May 9, 2019, 1:09 a.m.