Problem Pengolahan Data Gaya Berat Mikro antar Waktu

At time lapse microgravity survey will be got data in place for difference period. The Anomaly  caused by subsidence and density change under surface which related to groundwater level  change. This matter become problem when will take one of the anomaly sources to processed  is furthermore. Reduction one of anomaly source cannot be done direct but must be done with  filtering process. Process filtering done by using FFT (Fast Fourier Transform), its principal is  to move data from time domain to frequency domain. At frequency domain this is mathematics  process conducted. On subsidence case study in Semarang by using this technique indicate that  subsidence value from time lapse micro gravity survey have tendency is equal to result from  geodesy survey.