1. Center for Remote Sensing and Integrated Systems (CReSIS) University of Kansas,Lawrence,KS,USA
2. University of Washington,Dept. of Earth & Space Sciences,Seattle,W A,USA
3. Earth and Space Sciences, Program on Climate Change, & Quaternary Research Center University of Washington,Seattle,W A,USA
4. Amherst College,Department of Geology,Amherst,MA,USA