Geodetic systems are frameworks used to measure and represent the Earth's shape, orientation, and gravitational field. They provide a reference for mapping and navigation, ensuring that locations on the Earth's surface can be accurately identified. Common examples include the Global Positioning System (GPS) and various local systems tailored to specific regions. These systems rely on a network of geodetic markers and advanced technology to collect data. By using mathematical models, geodetic systems help in understanding the Earth's dynamics, including tectonic movements and sea-level changes, which are essential for various applications in science, engineering, and environmental monitoring.