The GPS continuously operating reference systems of GULFNet established by LSU’s Center for GeoInformatics (C4G) provide the latest tool in cutting-edge technology for Professional Land Surveyors throughout the State of Louisiana. Because the land elevations are constantly changing due to geologic subsidence, the traditional benchmark used by surveyors for centuries has become obsolete in Louisiana! Homeowners, businesses, and local governments count on reliable elevations to insure safety from flooding due to rainfall-engorged rivers as well as saltwater sheet flow effects from hurricanes. The National Flood Insurance Plan is based on surveyors providing reliable elevations on Flood Surveys for homeowner’s Flood Insurance policies. Subsiding elevations make benchmarks unreliable and useless from the Arkansas State line to the Gulf of Mexico and from The Texas State line to the Mississippi State line!
The only reliable source of correct and up-to-date elevation data in the entire State of Louisiana is the LSU GULFNet system of continuously operating reference stations (CORS). Established in accordance with Federal Guidelines and Specifications, the basic backbone of GULFNet is comprised of a subset of CORS sites that are termed “National CORS” sites that are publically available over the internet. However, the National CORS sites require surveyors to perform office computations after field observations are completed to check and to verify that the data is acceptable as well as to then compute final coordinates and especially final elevations.