1. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA.
2. National Center for Airborne Laser Mapping, University of Houston, Houston, TX 77004, USA.
3. California Geological Survey, Menlo Park, CA 94025, USA.
4. U.S. Geological Survey, 535 South Wilson Street, Pasadena, CA 91106, USA.
5. InfraTerra Inc., 220 4th Street, Oakland, CA 94607, USA.
6. GeoVit Vineyard Services, Napa, CA 94558, USA.