Comparison of Local Elevation with Network-based Real-time Kinematics

Abstract

Comparison of local values with network-based real-time kinematics surveying using the Internet is a geoid undulation modeling obtained by survey control points in that the area and performing a level test to compare the level values of the survey control points. Survey control points use measure by GNSS static methods, Leveling and Total Station. Testing the elevation from the geoid undulation model obtained from the surveyor control points use network-based real-time kinematics surveying using the Internet methods. There are many different types of geoid undulation modeling available such as EGM96, EGM2008 is earth gravity model , TGM2017 is a model of height in Thailand. These geoid undulation models use earth's gravity method, satellite surveying, aircraft surveying, or leveling surveying the data obtained from survey measure are taken into consider create a geoid undulation model using by geographic coordinates(,) and geoid undulation height(N). The grid distance modeled to about one second, or about one thousand eight hundred meters or more because of the long grid distance when taking these may be inaccurate due to the long grid distance. Therefore, the idea was to create a geoid undulation model from the survey control points in that area using data from the survey control points from static satellite surveying (,,h). and the elevation value from the leveling(H) is then created as a geoid undulation model file. Results from testing the geoid undulation model generated from control points and performing control point tests with network-based real-time kinematics surveying has a vertical tolerance of 0.0137 meters.