<I>Vadose Zone Journal</I> (IMAGE) American Society of Agronomy Caption Scientists measuring land surface roughness for soil moisture retrieval from Soil Moisture Active Passive (SMAP) satellite, as featured on this Vadose Zone Journal cover. Credit <I>Vadose Zone Journal</I> Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.