Description Usage Arguments Details Value Author(s) References See Also
Spatial and time variability indexes.
1 2 3 | idwNear(surround, point, nmax, ...)
terrainIndex(surround, point)
tempIndex(runVals)
|
surround |
A |
point |
A |
nmax |
the number of nearest observations that should be used for the interpolation. |
runVals |
A |
... |
Additional arguments for |
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.
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