What percentage of points must match the vertical accuracy to pass the NMAS?

The correct response to the percentage of points that must match the vertical accuracy to pass the National Map Accuracy Standards (NMAS) is 90%. This standard was established to ensure spatial data quality and reliability. In the context of vertical accuracy, it requires that a significant majority of points tested must be within a specified vertical tolerance relative to their true elevation. Achieving a 90% match indicates a high level of confidence in the accuracy of the dataset, which is crucial for various applications, such as flood modeling, land development, and other geospatial analyses. A lower percentage would imply a less stringent accuracy requirement, which may not meet the critical needs of precise geospatial work. Therefore, 90% serves as a necessary benchmark for datasets to be deemed reliable under NMAS standards.