1. MS 244-15, NASA Ames Research Center; Moffett Field CA 94035
2. Dep. of Environmental Science, Policy and Management; Univ. of California-Berkeley; Mulford Hall Berkeley CA 94720
3. State Key Lab. for Remote Sensing Science; Datun Rd., Chaoyang District, P.O. Box 9718 Beijing 100101 China
4. Yellowstone Ecological Research Center; 2048 Analysis Dr., Suite B Bozeman MT 59714