North American Vertical Datum of 1988

The North American Vertical Datum of 1988 (NAVD88) is a standardized reference system used to measure and compare elevations across North America. It provides a consistent zero point, derived from a network of precise measurements, allowing engineers, surveyors, and scientists to accurately determine elevations of land, water levels, and structures. NAVD88 helps ensure that measurements are uniform nationwide, which is essential for mapping, construction, flood risk assessment, and environmental management. Think of it as a common "baseline" marker for height, ensuring everyone uses the same reference for elevation data.