Mapping Of Leptospirosis Environmental Risk Factors and Determining the Level of Leptospirosis Vulnerable Zone In Demak District Using Remote Sensing ImageSiti Rahayu, Mateus Sakundarno Adi and Lintang Dian SaraswatiE3S Web Conf., 31 (2018) 06003DOI: https://doi.org/10.1051/e3sconf/20183106003