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Land gravity measurements for subsurface studies require good accuracy for three-dimensional measurement of station’s coordinate (X, Y, Z). These coordinate data will contribute to calculation of Bouguer anomaly correction in the research area. In this study, we compared the coordinate data measured using hand-held devices and geodetic GPS devices. A more accurate tool is a Trimble R4 geodetic GPS and then we select the acquired data as a reference (Ground Control Points). The hand-held devices that we used are consist of the SUUNTO Escape 203 altimeter and the Garmin GPSMAP 60CSx. The research areas of this studi are in Blora and Pandan Mountain. At that location, we conducted acquisition of elevation data and also gravity. The relative gravimeter used to observe variations of gravity in this study is Scintrex CG5. Gravitational data processing is performed until we obtain Complete Bouguer Anomaly (CBA). The results of this study, we get statistical comparison of the accuracy of elevation data as well as differences in CBA values from the study area. Accuracy of elevation data with hand-held devices based on field measurements in Blora and Mount Pandan reaches 6-53 and 54-95 times lower than a geodetic GPS device. The Bouguer anomaly comparison of the 50 point measurements at the two sites gave the difference range of -1.03 to 2.93 mGal.

Bouguer anomaly comparison using elevation data measured with hand-held device and geodetic GPS in Blora and Pandan Mountain