CST Level 1 Land Surveyor Certification Practice

What does NAVD 88 regulate?

1. Vertical coordinates

2. Geographical coordinates

3. Horizontal coordinates

4. Electronic coordinates

The correct answer is: Vertical coordinates

NAVD 88, which stands for North American Vertical Datum of 1988, is specifically designed to provide a consistent reference for vertical measurements across North America. It regulates vertical coordinates by establishing a standard for measuring elevations and depths, which are critical for various applications in land surveying, engineering, and mapping. This system was developed to replace the older National Geodetic Vertical Datum of 1929 (NGVD 29) and provides a more accurate baseline for measuring the heights of geographical features or structures, as well as for understanding how land elevations change over time due to natural processes or human activities. Using NAVD 88 ensures that surveyors can communicate and compare elevation data consistently and accurately across regions. In contrast to the other options, NAVD 88 does not pertain to geographical (which relate to location on the Earth's surface), horizontal (which relate to latitude and longitude measurements), or electronic coordinates (which refer to data provided by electronic systems). Each of these other types of coordinates serves different purposes and is governed by different standards or systems, highlighting the specific focus of NAVD 88 on vertical dimensions.