1. a ASRC Research and Technology Solution (ARTS), Contractor to the US Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center , Sioux Falls , SD , USA
2. b US Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center , Sioux Falls , SD , USA
3. c Stinger Ghaffarian Technologies (SGT), Contractor to the US Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center , Sioux Falls , SD , USA
4. d Department of Geography , University of Maryland , College Park , MD , USA