acor_table: Calculates correlogram values on a raster using fft.
In AdamWilsonLab/rasterAutocorr: Quickly calculate spatial autocorrelation on 2D rasters.
Description
Usage
Arguments
Value
References
Description
Applies the Wiener-Khinchin theorem to extract spatial autocorrelation using Fast Fourier Transform techniques. This results in an extremely fast way to calculate a complete correlogram (correlation as a function of distance) for a raster image.
Usage
1
acor_table(x, maxdist = 1500, verbose = F)
Arguments
x
A raster* object. Missing values are indicated by NA.
maxdist
Maximum distance (in km) to include in correlogram table. All possible distances are calculated using FFT, then trimmed to this value.
Value
The table of distances
References
en.wikipedia.org/wiki/WienerKhinchin_theorem
Xianlin Ma, Tingting Yao, A program for 2D modeling (cross) correlogram tables using fast Fourier transform, Computers & Geosciences, Volume 27, Issue 7, August 2001, Pages 763-774, ISSN 0098-3004, http://dx.doi.org/10.1016/S0098-3004(01)00007-3.
http://www.johnloomis.org/ece563/notes/freq/autoself/autoself.htm
http://www.seas.upenn.edu/~ese502/NOTEBOOK/Part_II/3_Spatially_Dependent_Random_Effects.pdf
AdamWilsonLab/rasterAutocorr documentation built on March 19, 2020, 12:01 a.m.
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Description Usage Arguments Value References
Description
Applies the Wiener-Khinchin theorem to extract spatial autocorrelation using Fast Fourier Transform techniques. This results in an extremely fast way to calculate a complete correlogram (correlation as a function of distance) for a raster image.
Usage
1 | acor_table(x, maxdist = 1500, verbose = F)
|
Arguments
x |
A raster* object. Missing values are indicated by NA. |
maxdist |
Maximum distance (in km) to include in correlogram table. All possible distances are calculated using FFT, then trimmed to this value. |
Value
The table of distances
References
en.wikipedia.org/wiki/WienerKhinchin_theorem
Xianlin Ma, Tingting Yao, A program for 2D modeling (cross) correlogram tables using fast Fourier transform, Computers & Geosciences, Volume 27, Issue 7, August 2001, Pages 763-774, ISSN 0098-3004, http://dx.doi.org/10.1016/S0098-3004(01)00007-3.
http://www.johnloomis.org/ece563/notes/freq/autoself/autoself.htm
http://www.seas.upenn.edu/~ese502/NOTEBOOK/Part_II/3_Spatially_Dependent_Random_Effects.pdf
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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