Comparative Analysis of Sentinel-3 and Terra MODIS Satellite Images for Air Temperature Observation in Denpasar Area

Abstract

This study evaluates the air temperature products of Sentinel-3 and Terra MODIS satellite images, with the aim of determining the comparison results of Sentinel-3 and Terra MODIS satellite images for air temperature observations, and also to determine the minimum and maximum temperatures of the Denpasar area obtained using satellite images. Correlation relationship analysis and Root Mean Square Error (RMSE) were used to investigate the correlation and the degree of accuracy between the air temperature of satellite imagery and the air temperature of field observations. The results showed that Terra MODIS satellite imagery has better accuracy to BMKG air temperature compared to Sentinel-3 satellite imagery. Terra MODIS imagery has a correlation coefficient value of 0.95 and an RMSE value of 0.51, while Sentinel-3 satellite imagery has a correlation coefficient value of 0.78 and an RMSE value of 0.93, so it can be noted that Terra MODIS satellite images are better used in air temperature observations than Sentinel-3 satellite images.  The results also showed that the minimum temperature detected by Sentinel-3 satellite images from 32 observations was 9.51°C on September 23, 2021 and the maximum temperature was 41.50°C on April 14, 2021. Meanwhile, in Terra MODIS satellite images from 32 observations, the minimum temperature was 20.57°C on September 23, 2021 and the maximum temperature was 37.08 on April 16, 2021.