Geospatial Surveying Essentials: GPS, Traversing, and Image Analysis
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Understanding GPS: Accuracy and Applications
The Global Positioning System (GPS) is a satellite-based navigation system that provides location, velocity, and time synchronization. Its effectiveness is influenced by several factors, and it has numerous practical applications.
Factors Affecting GPS Accuracy
- Number of Satellites: GPS receivers typically need signals from at least four satellites to calculate accurate positioning. More satellites can significantly improve accuracy.
- Signal Obstruction: Buildings, dense terrain, and adverse weather conditions can block or weaken GPS signals, thereby reducing accuracy.
- Atmospheric Conditions: Ionospheric and tropospheric conditions can delay and distort GPS signals, affecting the precision of measurements.