Planet Labs runs a fleet of little CubeSats and Planet Explorer Beta is their free tool for viewing their data. The 1-month mosaics are pretty nice, you can easily save a screen image, measure distances/areas, and upload KML, shapefiles, etc.
Beyond that it gets a little more murky: the daily images don't seem to show (or maybe it is just slow?) and it is not clear how one could obtain the actual image for proper analysis. They offer an Education and Research Program and so it should be possible to get at the data.
McCabe et al. (2017, Water Resources Research) discuss some interesting applications of the Planet Labs CubeSat data in hydrology.
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