What is the least accurate NGS horizontal distance standard?

The least accurate NGS horizontal distance standard is the third order class II. This classification is designed to accommodate surveys that do not require high precision, which is reflected in its larger allowable error margins compared to the other classes.

Lower order designations in surveying typically indicate less stringent requirements regarding measurement and accuracy. In this case, third order class II standard is tailored for projects where the highest level of precision is not essential, making it suitable for general mapping or preliminary surveys where minor discrepancies can be tolerated.

The first order, second order class I, and third order class I standards are all associated with higher accuracy specifications and are utilized for more demanding geodetic work, thereby distinguishing them from the third order class II standard in terms of precision and application.