GPS Survey Monuments on the Virginia Coast Reserve 1992-1994

The Virginia Coast Reserve Long-term Ecological Research project, in association with the Virginia Marine Resources Commission, conducted an intensive GPS survey during February 1992. A second GPS survey was conducted in August 1994 to add supplemental GPS monuments. Most monuments consist of stainless steel pipes driven to refusal and topped with a bolt with a point imprinted on it. Others may consist of existing markers or cultural features. Elevations refer to the monument, not the surrounding ground surface. All data were processed by the VCR/LTER. Several caveats must be applied to use of this survey network: 1. These are preliminary results and are subject to change as the network is revised. 2. This network is designed for research purposes only, the data are not suitable for legal uses of survey data. 3. The network includes several US Government benchmarks, but except for the VCR1 monument recently resurveyed and "fixed" by the National Geodetic Survey (see below), the coordinates for those benchmarks have not been adjusted to agree with blue-book values for those benchmarks. 4. Elevations are based on mean sea-level (NAVD88) for a single point (VCR1). No geoid corrections have been applied to any other point. *** Update: MINOR coordinate shifts resulting from NGS adjustment of the VCR1 monument's estimated lat/lon following the NAD83 (Va) HARN adjustment of 2011 have been calculated (0.017 m S, 0.001 m W), but not otherwise applied to the data. A shapefile of the VCR GPS network based on the original coordinates has also been included.