1. A method for pan sharpening a first multispectral image of an area, comprising: providing at least a second multispectral image of the area, the first and second multispectral images comprising a synoptic pair and each multispectral image comprising multiple spectral bands of M band groups, where M is a number of band groups in a range of 1 to M; providing a panchromatic image of the geographical area, the panchromatic image comprising a p band; for each band group m in the range of 1 to M, with a computer: (a) upsampling band group m; (b) pan sharpening band group m using the p band; (c) producing a pan sharpened result for band group m; and continuing steps (a)-(c) to produce pan sharpened results for each band group from 1 to M; and fusing together the pan sharpened results for band groups 1 to M to produce a master fused image.