Functions for converting time series of spatial abundance or density data in raster format to vector fields of population movement using the digital image correlation technique. More specifically, the functions in the package compute crosscovariance using discrete fast Fourier transforms for computational efficiency. Vectors in vector fields point in the direction of highest two dimensional crosscovariance. The package has a novel implementation of the digital image correlation algorithm that is designed to detect persistent directional movement when image time series extend beyond a sequence of two raster images.
Package details 


Author  Devin Goodsman [aut, cre] (<https://orcid.org/0000000319355779>) 
Maintainer  Devin Goodsman <goodsman@ualberta.ca> 
License  GPL (>= 3) 
Version  0.1.2 
Package repository  View on CRAN 
Installation 
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