STUDY OF HORIZONTAL CHANGES IN SRGI 2013 FROM EPOCH 2012.0 TO EPOCH 2021.0

• Main Author: Hexa Fauzan, Rafi
• Format: Final Project
• Language: Indonesia
• Subjects: Geografi matematis
• Online Access: https://digilib.itb.ac.id/gdl/view/85413
• Institution: Institut Teknologi Bandung

Indonesia is a geologically complex region, located at the boundary between active tectonic zones (Hall, 2009). Due to various dynamics on the Earth's surface, which result in the movement of points on the Earth's surface, a consistent and standardized system is needed (Abidin, 2001). Indonesia has the Indonesian Geospatial Reference System (SRGI) 2013, which uses the global geospatial reference framework ITRF 2008, and is realized in the form of the Geodetic Control Network (JKG). The updating of SRGI can be done due to various factors that may affect the changes in the positions of the JKG points. The update of SRGI2013, by adding a new epoch, will lead to a number of consequences that may occur in practice. This research aims to determine the magnitude of the movement of observation station points in Indonesia and to identify the impact of the SRGI2013 update on geospatial information, in this case, the Indonesian Topographic Map (PRBI), based on the magnitude of the movement of these observation station points. The observation station points are grouped into 11 clusters that have similar movement direction characteristics, and from each cluster, the average horizontal movement value is obtained. The average movement values are then compared with the map accuracy of PRBI, with 8 out of 11 clusters not sufficient to surpass the tolerance for Class 1 of the largest scale PRBI map (1:1,000). Therefore, based on the movement of CORS stations, the change from SRGI2013 epoch 2012.0 to epoch 2021.0 does not significantly impact the accuracy of the Indonesian Topographic Map.