DETERMINATION OF DATUM TRANSFORMATION PARAMETERS IN PERTAMINA HULU MAHAKAM (PHM) ENVIRONMENT

• Main Author: Rafi Adnanto, Ariq
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/81699
• Institution: Institut Teknologi Bandung

PT Pertamina Hulu Mahakam (PHM) uses the local datum P2Exc-T9 as the datum for its operational work maps. Historically, PHM has had datum transformation parameters between ITRF93 Epoch 1995.2 - Total to the local datum P2Exc-T9 used for operational purposes. However, there is a coordinate discrepancy of 70 cm east and 2 cm north when these transformation parameters are applied to WADGNSS technology, which uses the ITRF2020 datum for navigation purposes. This discrepancy does not meet PHM's desired position accuracy criteria of less than 10 cm. This difference is due to the deformation effect in the Mahakam area. Therefore, time-specific transformation parameters between the ITRF2020 datum and the P2Exc-T9 datum that account for deformation effects are required. Two transformation models, the 7-parameter Helmert and the 10-parameter Molodensky-Badekas, are used to find the best transformation model. Measurement data from 7 common points and 6 check points in the Mahakam area are used to calculate and test the transformation parameters between the ITRF2020 datum and P2Exc-T9. The results from tests using test points show that the transformation parameters meet PHM's desired accuracy standard of less than 10 cm. Based on the RMSE values from the parameter processing results, the 10-parameter Molodensky-Badekas transformation provides smaller residuals compared to the 7-parameter Helmert transformation, making the 10-parameter Molodensky-Badekas transformation model more suitable for PHM operational applications.