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Remote sensing of salinityThe complex dielectric constant of sea water is a function of salinity at 21 cm wavelength, and sea water salinity can be determined by a measurement of emissivity at 21 cm along with a measurement of thermodynamic temperature. Three aircraft and one helicopter experiments using two different 21 cm radiometers were conducted under different salinity and temperature conditions. Single or multiple ground truth measurements were used to calibrate the data in each experiment. It is inferred from these experiments that accuracies of 1 to 2%/OO are possible with a single surface calibration point necessary only every two hours if the following conditions are met--water temperatures above 20 C, salinities above 10%/OO, and level plane flight. More frequent calibration, constraint of the aircraft's orientation to the same as it was during calibration, and two point calibration (at a high and low salinity level) rather than single point calibration may give even better accuracies in some instances.
Document ID
19760010497
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Thomann, G. C. (NASA Earth Resources Lab. Bay Saint Louis, MS, United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1975
Publication Information
Publication: NASA Earth Resources Surv. Symp., Vol. 1-C
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
M-12
Accession Number
76N17585
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19760010464Collected WorksNASA Earth Resources Survey Symposium. Volume 1-C: Land use, marine resources
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