1/2/2024 0 Comments Vertical datum conversionWhy have I noticed a change in the District’s water elevation data? By using one common datum, engineers and scientists from different agencies are able to communicate and share accurate and consistent information more easily. Johns River water management districts have also migrated to the NAVD 88. Many federal, state, and local agencies, such as the US Army Corps of Engineers, the Federal Emergency Management Agency and United States Geological Survey, have migrated to the NAVD 88 standard because the NGVD 29 datum will no longer be supported in the future. Why has the Southwest Florida Water Management District (District) upgraded to NAVD 88? Since it was created, more than 450,000 benchmarks have been set with NAVD 88 elevations and there are more than one million kilometers of leveling data for this datum. In 1993, Congress adopted NAVD 88 as the official civilian vertical datum for the United States and instructed all federal agencies to upgrade to the new datum. What is the North American Vertical Datum of 1988 (NAVD 88)? As a result, NGVD 29 has been superseded by the North American Vertical Datum of 1988. However, as technology improved and the demand for greater accuracy increased, inherent inaccuracies were uncovered in NGVD 29. This datum was used to measure elevation above (altitude) and depression below (depth) mean sea level. Originally called the Sea Level Datum of 1929, it was created for vertical control surveying in the United States. What is the National Geodetic Vertical Datum of 1929 (NGVD 29)? A datum is a standard position or level (i.e., starting point) from which measurements are taken.
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