Abstract
The National Geodetic Survey began publishing a series of experimental geoid (xGEOID) models annually since 2014. The latest experimental model is xGEOID20. The San Joaquin Experimental Range (SJER) in Fresno County, California is surveyed using Static GPS and precise levelling and a local geoid (SJER Geoid) is created. In this study, SJER Geoid is compared against xGEOID20A&B models and the results are tabulated. The results indicate that xGEOID20A&B slopes agree with the GPS/levelling data well even in such a small area. SJER Geoid model agrees with the xGEOID20 models at 7 mm level. The biases about 80 cm are within the expected range between the North American Vertical Datum of 1988 (NAVD88) and North American-Pacific Geopotential Datum of 2022 (NAPGD2022).
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