What is the main function of GNSS in geodetic applications?

The main function of Global Navigation Satellite Systems (GNSS) in geodetic applications is to provide precise positioning using a constellation of satellites. GNSS utilizes a network of satellites that transmit signals to receivers on the Earth’s surface. By calculating the time it takes for these signals to travel from satellites to the receiver, the system can triangulate the receiver's exact location. This positioning capability is crucial for a wide array of geodetic applications, including surveying, mapping, and navigation.

In contrast to other options, analyzing geographical trends and developing geographic information systems might benefit from GNSS data but are not the direct functions of GNSS itself. Enhancing local surveying techniques can occur with GNSS, but again, this is more dependent on the implementation of GNSS data rather than the fundamental purpose of GNSS technology. The precise positioning provided by GNSS is foundational to achieving accurate measurements in various geodetic surveys and studies.