PEMANFAATAN TEKNIK RGB PADA CITRA SATELIT HIMAWARI-8 UNTUK ANALISIS DINAMIKA ATMOSFER KEJADIAN BANJIR LAMPUNG 20 - 21 FEBRUARI 2017

Abstract

RGB technique (Red-Green-Blue) is one of the satellite image interpretation techniques which combine multiple channels in overlapping red, green and blue to present information that is easier to understand. RGB technique can be used in the study of weather analysis primarily to identify the specific conditions such as hydrometeorological disasters. The incidence of floods on 20 to 21 February 2017 soaked for at least seven regions and a city in the province of Lampung, which was indicated to occur due to extreme rainfall. Total rainfall reported at the Station Climatological Masgar is 107.0 mm / day, Observation Post Politeknik Negeri Lampung was measured as 159.6 mm / day and Observation Post Kemiling Bandar Lampung measured 154.0 mm / day, where rainfall is categorized as very heavy rain according to BMKG (> 100 mm / day). The results of the regional analysis conditions showed a lower air pressure area, convergence and shearline in western and central Lampung region. Analysis of satellite imagery showed a collection of clouds with the very cold cloud top temperature at top, the RGB technique identification using Night Microphysics and the distribution of air masses (Air Mass) showed the process of intensive microphysics and mass air flow which then caused rain clouds that grew and extended over Lampung region before and during floods. Results of products HCAI (High-resolution Cloud Analysis Information) showed the cloud was dominated by Comulonimbus (Cb) and solid convective clouds (Dense Cloud).