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Title: Large-area soil moisture estimation using INSAT-VHRR infrared data
Authors: Pathak, P N
Rao, B M
Potdar, M B
Issue Date: Jun-1993
Publisher: NISCAIR-CSIR, India
Abstract: It has been shown by earlier workers that rate of change of land surface temperature (ΔT) during midmorning hours as determined from the thermal infrared sensor onboard geosynchronous satellite can provide a good signature of area-averaged soil moisture. In order to examine the feasibility of this approach, a pilot study was undertaken using limited data of INSAT-VHRR. Since no concurrent measurements of soil moisture and other meteorological data were available, the analysis was carried out making a number of simplifying assumptions. The observed ΔT during April 1991 showed a reasonably good association with arid and semi-arid regions of Rajasthan and Gujarat, respectively, while ΔT during September 1991 was found to be negatively correlated with the area-averaged total rainfall data over Gujarat. Although these results are encouraging, they can at best be considered as indicative of physical processes in view of the simplifying assumptions. More rigorous analysis is essential to establish the validity of the approach.
Page(s): 156-164
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.22(3) [June 1993]

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