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Hugh, There has been quite a bit of Remote Sensing for Water Conservation research conducted in recent years at the ARS - Water Conservation Laboratory in Phoenix, Arizona. I would suggest that you might want to contact either Ed Barnes, Agricultural Engineer <ebarnes@uswcl.ars.ag.gov> or Tom Clarke, Physical Scientist <tclarke@uswcl.ars.ag.gov> with your specific questions. Tom Thomas L. Spofford, Irrigation Engineer USDA - Natural Resources Conservation Service National Water & Climate Center, Water Science & Technology Staff 101 SW Main St., Suite 1600 Portland, OR 97204 PH (503) 414-3075 / FAX (503) 414-3101 e-mail: <tspofford@wcc.nrcs.usda.gov> <http://www.wcc.nrcs.usda.gov/water/quality/frame/irrigate.html> ********************************************************* "When the well's dry, we know the worth of water." (Benjamin Franklin, (1706-1790), Poor Richard's Almanac, 1746) ********************************************************* >>> <owner-sowacs@aqua.ccwr.ac.za> 05/11/99 12:49AM >>> NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Hugh Campbell <hcampbel@webfront.net.au> writes Hi listmembers, Does anybody know where I can get information on this type of technology and how or if it could be used to remotely sense soil moisture from afar (say several metres above the surface). I understand it is used in measuring water stress in a plant canopy but what if there are no plants? **********************************************************