Time-Series Ground Subsidence in Bali Before and During the Covid-19 Pandemic Monitored by PS-INSAR Method

Some researchers have reported subsidence in Bali. However, the main factor and the subsidence mechanism remain unclear due to a lack of data. One possibility is due to groundwater extraction. During the Covid-19 pandemic, the number of visitors to Bali decreased significantly. Using the persistent interferometric synthetic aperture radar (PS-InSAR) and the trend model method, we found a strong relationship between the number of visitors and the subsidence velocity. The subsidence velocity decreased rapidly during the Covid-19 pandemic. It may cause a decrease in groundwater extraction. It may be proven that groundwater extraction is one factor of subsidence in Bali. However, a detailed field investigation, such as groundwater table measurement, is required to validate this new finding. © 2022 IEEE.

Impact of Covid-19 Pandemic on Electricity Consumption and Nighttime Lights Based on NPP-VIIRS DNB Image Products

This paper discusses an early investigation of the impact of the Covid-19 on the socio-economic activities by using the electricity consumption and the satellite nighttime light approach. This method was implemented in the island of Bali, a well-known tourism destination. The electricity consumption trend was investigated during a period of 2019-2020 and the result then was confirmed with the satellite image of nighttime light. The analysis results have shown that the declined electricity energy usage correlates with the reduced brightness level of the night time light. It was also found that the night time light image (NTL) from remote sensing data has successfully determined the areas with a significantly decreased socio-economic activities. In contrast, the image has also uncovered some areas with an increased in night time light brightness, which indicates an increased in socio-economic activities. © 2021 IEEE.