The yellow square is 30 meters on a side, exactly the size of a single pixel of Landsat data and slightly larger than a baseball diamond. The aerial photograph on the right shows Target Field in Minneapolis. The Landsat data on the left shows healthy vegetation in green while streets and buildings range from reddish-brown to white. Landsat’s spatial resolution of 30 meters allows us to see the landscape at a human scale while simultaneously collecting data across a broad swath 185 kilometers (or 115 miles) wide.
+ Zoom into Target Field with Landsat [flickr]
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.