non-penetrating sensing

[Dr. Stephen L. Rawlins <srawlins@televar.com>]

Much of this work with NASA was coordinated with the ARS Hydrology Lab at
Beltsville.
Maryland.


At 05:28 AM 2/6/98 GMT, owner-sowacs@aqua.ccwr.ac.za wrote:
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>Robert,
>
>Over the years there has been a lot of work on microwave sensing of
>surface soil moisture, but all that I have read comes down to one problem. 
>It is essentially unknowable how deeply the signal penetrates and thus the
>volumetric water content cannot be reproducibly calculated.  Some work
>with vertical and side scanning radar to get some triangulation on the
>signal response looks promising, but the paper I reviewed last year on it
>did not show that it could be done that way either.  No, I don't know if
>was published.
>
>Best regards, Steve
>
>--------
>Steve Evett    srevett@ag.gov   http://www.cprl.ars.usda.gov/ USDA-ARS,
>P.O. Drawer 10, 2300 Experiment Station Road
>Bushland, Texas 79012.  Tel:806.356.5775  FAX:806.356.5750
>---------------------------------------------------
>
>
>
Dr. Stephen L. Rawlins
2638 Eastwood Avenue
Richland, WA 99352
509-627-4943
email srawlins@televar.com