A COMPARATIVE ANALYSIS BETWEEN MODIS LST LEVEL-3 PRODUCT AND IN-SITU TEMPERATURE DATA FOR ESTIMATION OF URBAN HEAT ISLAND OF SOFIA
Journal Title: Aerospace Research in Bulgaria - Year 2016, Vol 28, Issue
Abstract
In present study we use global eight-day MODIS Land Surface Temperature (LST) and Emissivity Level-3 satellite products (MOD11A2 and MYD11A2) with in-situ data from automatic weather stations (AWS) to analyze usability and reliability of satellite derived LST data for Urban Heat Island estimation for the city of Sofia, Bulgaria. In order to achieve the study aim the terrestrial measurements from eight AWS were compared to the extracted pixel values from the MODIS LST Level-3 products. The so formed time-series were averaged to align with MODIS LST Level-3 products and gap-filled using the established relationship between the satellite and terrestrial data. A very strong positive relationship (R2~0.97 at 95% confidence interval) was found for the eight ground AWS which readings were analyzed on a diurnal and seasonal basis for the year of 2013. It is suggested that the pronounced diurnal and seasonal variations in the trends and correlation between satellite and in situ temperature data were primarily related to the different land-use/land-cover type of the mixed pixel of MODIS.
Authors and Affiliations
Ivan Yanev, Lachezar Filchev
Keywords
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