SSIMmap

Extends the classical SSIM method proposed by 'Wang', 'Bovik', 'Sheikh', and 'Simoncelli'(2004) doi:10.1109/TIP.2003.819861. for irregular lattice-based maps and raster images. The geographical SSIM method incorporates well-developed 'geographically weighted summary statistics'('Brunsdon', 'Fotheringham' and 'Charlton' 2002) doi:10.1016/S0198-9715(01)00009-6 with an adaptive bandwidth kernel function for irregular lattice-based maps.