Which two classifications exist for control surveys?

• A. Geodetic and Project Control Surveys
• B. Topographic and Aerial Surveys
• C. Primary and Secondary Surveys
• D. Field and Laboratory Surveys

Answer: (A)

Control surveys are categorized by the scope and purpose of the reference network. Geodetic control surveys build a wide, interconnected network tied to a geodetic datum, providing accurate positions over large areas and supporting national or regional mapping. Project control surveys establish a localized network for a specific project, offering precise references within the project area and usually tied to the broader geodetic network but not extending across large regions. This distinction matters because you need the broad, high-accuracy framework for large-scale mapping and the localized framework to guide a particular project with consistency to that framework. The other terms describe data collection methods or levels of work rather than classifications of the control network itself.