Source: USGS Landsat Mission
+ LandsatLook Viewer specifics
+ LandsatLook Viewer
+ USGS Rachel Headley’s presentation at the ESRI UC (see “Afternoon Session”)

Above the Earth, Below the Surface: Landsat’s Role in Monitoring Water Quality
Safeguarding freshwater resources is crucial, and while scientists use a variety of ground-based techniques to gauge water quality, the Landsat program has provided water quality data from orbit for decades.