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View recent updates history. The regional perspective view is enhanced further by digitally mosaicking different images collected by the same satellite to cover an even larger regional area. Another advantage is the multitemporal aspect of satellite images, which can be used to monitor changes on the Earth's surface or update an existing data set. The digital image map results shown here were published in hardcopy format as USGS Miscellaneous Investigation Series Map I-2560. The image map was prepared by the USGS with joint support from the National Science Foundation Interagency Agreement OPP-9114787.