fastfocal: Fast Multiscale Raster Extraction and Moving Window Analysis with FFT

Provides fast moving-window ("focal") and buffer-based extraction for raster data using the 'terra' package. Automatically selects between a 'C++' backend (via 'terra') and a Fast Fourier Transform (FFT) backend depending on problem size. The FFT backend supports sum and mean, while other statistics (e.g., median, min, max, standard deviation) are handled by the 'terra' backend. Supports multiple kernel types (e.g., circle, rectangle, gaussian), with NA handling consistent with 'terra' via 'na.rm' and 'na.policy'. Operates on 'SpatRaster' objects and returns results with the same geometry.

Version:	0.1.3
Depends:	R (≥ 4.1.0)
Imports:	terra, graphics, grDevices, stats
Suggests:	testthat (≥ 3.0.0), knitr, rmarkdown, dplyr, withr, spelling
Published:	2025-09-23
DOI:	10.32614/CRAN.package.fastfocal
Author:	Ho Yi Wan [aut, cre]
Maintainer:	Ho Yi Wan <hoyiwan at gmail.com>
BugReports:	https://github.com/hoyiwan/fastfocal/issues
License:	MIT + file LICENSE
URL:	https://hoyiwan.github.io/fastfocal/, https://github.com/hoyiwan/fastfocal, https://doi.org/10.5281/zenodo.17074691
NeedsCompilation:	no
Language:	en-US
Citation:	fastfocal citation info
Materials:	README, NEWS
CRAN checks:	fastfocal results

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