Analysis of the Land Surface Temperature Estimated from Different Satellite Sensors over Romania

This paper deals with the analysis of the thermal field parameters using the space radiometry information for the infrared channels of MODIS-TERRA/AQUA/MSG satellite data and the infrared/microwave of the ATOVS system onboard NOAA/EPS satellites. Different methods and algorithms have been studied to derive land surface temperature (LST). Relatively homogenous surface emissivity areas from all over Romania were chosen based on the availability of appropriate satellite data and auxiliary data; the latter being used for validation. Each type of data has different ways of being acquired and processed and these are described in details. Two kinds of data (sensor and satellite characteristics and resolution) were taken into consideration in this study in order to estimate the land surface temperature. Modified split-window methods were mainly studied and there were chosen quasi-homogenous bodies were chosen as test areas for the emissivity values. A good correlation between existing LST products were obtained in the case of MSG data. The ATOVS temperature was then compared with the LST temperatures in order to find if there is a correlation between satellite derived air temperatures at 2m and LST temperatures, which, if true, could be usefull in estimating LST in cloudy conditions, since ATOVS derived profiles can be calculated with the same accuracy independently of the cloud cover. A linear relationship was found.

DIAMANDI Andrei;  OANCEA Simona;  ALECU Elena; 

2010-09-20

EDITURA ACAD ROMANE

JRC59331

1221-1451,