Time Series of Land subsidence rate on Coastal Demak Using GNSS CORS UDIP and DINSAR B. D. Yuwono, S. Subiyanto, A. S. Pratomo and Najib E3S Web Conf., 94 (2019) 04004 Published online: 08 May 2019 DOI: 10.1051/e3sconf/20199404004