Featured Video: NASA's SMAP: Mapping the Water Under Our Feet December 8, 2017 By Cassia Smith Source Water Protection, Sustainability featured videos, soil moisture, source water, water availability 0 NASA's SMAP (Soil Moisture Active Passive) satellite provides worldwide soil moisture readings every 2-3 days. This data is invaluable to scientists, engineers, and local decision makers alike, improving flood prediction and drought monitoring. To see some of the images it has produced in the past, go here. Comments are closed.