Spatial analysis of rice phenology using Sentinel-1 and Sentinel-2 in Karawang Regency

Abstract

Karawang Regency is the top rice producer within West Java, Indonesia. Accurate information about the number of harvest area is essential in rice production in Indonesia. The Sentinel imageries (Sentinel-1 and Sentinel-2) which have a spatial resolution of 10 meters can provide spectral information on the earth surface in relatively narrow temporal resolution. The study aims to spatially analyze the rice field phenology using Sentinel-1 and Sentinel-2 imagery and estimate the rice productivity in Karawang Regency. The study used Synthetic Aperture Radar (SAR) Sentinel-1, with the C-Band, which are capable of monitoring rice phenology and Sentinel-2. The combination of polarization from SAR and vegetation index algorithm from the optical image are used to determine the age of rice plants, which then used to estimate rice productivity. The stage of rice was land preparation, vegetative, generative, and harvesting. The result from the estimation of harvest area is between 102,965.00 - 109,338.27 hectares, and the estimation of rice productivity is 5-6 tons/hectares in Karawang Regency.