Accuracy Analysis of Indonesian Geoid Model Based On Grids

Abstract

Providing geospatial data and information services like the Indonesian geoid model is one of the important things on implementation of The Regulation of Head of the Geospatial Information Agency (BIG) No. 15 of 2013 about Indonesia Geospatial Reference System 2013 (SRGI2013). The geospatial information service requires innovation to fulfill the needs of the user. The provision of Indonesian geoid model with various grid resolutions is one of the forms of renewal that designed to meet the needs of users based on the accuracy level that needed. Each geoid model with a different grid resolution will produce different geometries as well. Therefore, the value of geoid undulation on a certain coordinate will be different according to the grid resolution. Based on that case, this paper will analyze the accuracy of The Indonesian geoid model based on the various grid resolution. Grids resolution that used in this case is 36”, 1’, 2.5’, and 5’. The accuracy of the geoid model is obtained from the standard deviation of the difference between geometric undulation values and gravimetric undulation values in 186 control points. The result of this study shows that Indonesian geoid model with the grid resolution 36”, 1’, 2.5’, and 5’ have the geoid accuracy 5.129 cm, 6.472 cm, 9.584 cm, dan 13.942 cm sequentially. Based on that result, we can conclude that the less grid resolution of geoid model will produce a higher accuracy of the geoid model. In addition, this study could be a consideration for every user to use the Indonesian geoid model based on their need and specification.