Which of the following is NOT a type of geodetic survey?

In the context of geodetic surveys, the classification of surveys into different orders pertains to the accuracy and precision of the measurements taken. First-order, second-order, and third-order surveys are established categories that denote the level of precision achievable based on the methods and technology used.

First-order surveys are the most accurate, often used for establishing benchmarks and control points over large areas where high precision is essential. Second-order surveys provide slightly less precision and are used for smaller areas or regions where less stringent accuracy is acceptable. Third-order surveys are typically employed for localized tasks that do not require the high precision of the first or second orders but still have defined standards for accuracy.

When it comes to the fourth-order survey, this classification is not commonly recognized within standard geodetic surveying practices. While there may be various methodologies and practices in the field, the formal categorization typically encompasses only first, second, and third orders, making it clear why the fourth-order does not fit within established types of geodetic surveys. Therefore, identifying the fourth-order as not being a type of geodetic survey aligns with the established categorizations in the field.