Microwave Emissivity Studies of Land Cover around Kanakapura Region Using High Spatial Resolution SAPHIR
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RESEARCH ARTICLE
Microwave Emissivity Studies of Land Cover around Kanakapura Region Using High Spatial Resolution SAPHIR M. P. Vasudha1 • G. Raju1 Received: 1 June 2018 / Accepted: 15 October 2018 Ó Indian Society of Remote Sensing 2018
Abstract Land emissivity sensed within a suitable range of wavelengths by microwave radiometer is useful to deduce land surface temperature and land surface emissivity. Brightness temperature measurements by space-borne microwave sensors have been utilized to determine land surface emissivity for the study of climatology, hydrological and agricultural applications. Currently, application of sounder data is gaining attention, in analyzing land surface characteristic features especially due to the higher spatial resolution, in general. In the present work, an attempt is made to obtain land surface emissivity from the six channels of SAPHIR (Sondeur Atmospherique du Profil d Humidit Intertropicale par Radiometrie), sensor with special reference to bare land and south Western Ghats of India during pre-monsoon and post-monsoon seasons. The innovation of the present analysis is to demonstrate the possibility of estimating and retrieving surface parameters from emissivity values retrieved from brightness temperature measured from SAPHIR sounder with channel 6 of 183.31 ± 11.0 GHz over selected study area with various surface conditions. Further, the present analysis relates to application of emissivity values retrieved from brightness temperature measured from SAPHIR sounder with channel 6, i.e., 183.31 ± 11.0 GHz for the study of vegetation, climatology and agricultural applications. Keywords Land surface emissivity Megha-Tropiques SAPHIR SSM/I Brightness temperature
Introduction Microwave radiance estimates are broadly useful for retrieval of atmospheric geophysical parameters, for example, integrated water vapor, precipitation rate, cloud liquid water content, and water vapor and temperature profiles apart from terrestrial and ocean surface studies. The longer wavelength of microwaves, compared to visible and infrared, enables it to penetrate through clouds, haze, rain and dust and ensures remote sensing under almost all weather and environmental conditions. Microwaves are used for earth surface studies which include the estimation of soil moisture, vegetation, snow and ice cover and subsurface studies for geological applications. Microwave emissivities of land surfaces can be estimated from special & M. P. Vasudha [email protected] 1
Department of Electronics and Communication Engineering, School of Engineering and Technology, JAIN (Deemed-tobe-University), Bangalore, India
sensor observations, and measurement will be useful for the study of climatologically, hydrological and agricultural applications like vegetation health monitoring. The land emissivity within a suitable wavelength measured by microwave imager/scanner/sounder radiometer is used to deduce land surface temperature. LSE includes emissivity of bare soil, vegetation canopy, wet non-agricultural land, wet
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