Analysis of accuracy the InaCORS BIG online post-processing service

Applications for control point topographic mapping are currently almost done by the GNSS observation method. One method provided by the Indonesia Geospatial Information Agency (BIG) is an online post-processing called InaCORS. This process is achieved by uploading GNSS observation data (RINEX) to the web. With this method, using only 1 GNSS receiver, control points for mapping can be obtained, and the calculation processing does not require in-depth knowledge of baseline processing. The purpose of this research was to determine the accuracy of the online post-processing InaCORS method if it is used as a mapping control point with a baseline between 500 and 3500 m. The biggest difference in the results are at northing (N) = 0.028 m easting (E) = 0.060 m, and elevation (z) = 0.084 m.