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Differential Leveling to CGPS Stations in Southern California

This project was undertaken by CSRC to establish a North American Vertical Datum of 1988 (NAVD88) differential elevation on a selection of continuous GPS (CGPS) stations that are part of the Southern California Integrated GPS Network (SCIGN) array. (Further work is currently being done in other areas of the State but this section will concentrate on the first leveling project completed, which was in Southern California). The purpose of this project is to establish an orthometric height on the base of the preamplifier of the antenna (BPA) and the geodetic reference mark (GRM) at each selected station which then can be used as vertical control in an adjustment to establish GPS derived orthometric heights (+/- 2cm) on all the CGPS stations in Southern California (the 10 southernmost counties). This process is to help fulfill the CSRC's function of providing vertical spatial reference to surveyors and other geodetic users in the State of California. Related documents: Differential Leveling to CGPS Stations   An overview of this project in southern Calfornia. Specifications and Procedures for Second Order, Class II Geodetic Leveling to Establish Elevations on CORS Table of continuous GPS station differential NAVD88 elevations NGS FGCS Specifications and Procedures to Incoporation Electronic Digital/Bar-Code Leveling Systems