GPStietojen

GPStietojen, or GPS data, are measurements produced by a GPS receiver that enable determination of geographic position, velocity and time. Typical data elements include latitude, longitude and optionally altitude, a timestamp in Coordinated Universal Time, and derived values such as speed and course. Quality metrics recorded with GPS data can include the number of satellites in view, dilution of precision (DOP) and signal quality indicators.

GPS data can be transmitted in standard formats such as NMEA 0183 sentences (for example GGA, RMC, GSA and GSV). Receivers may also provide raw observables or exchange data in formats like RINEX or GPX. Many modern devices use multiple global navigation satellite systems (GNSS) and combine signals from GPS, GLONASS, Galileo and BeiDou to improve fix reliability and accuracy, a concept known as multi-GNSS positioning.

Applications of GPStietojen include vehicle navigation and fleet management, mapping and surveying, geotagging of photos and sensor data, and scientific research into movement patterns and geodynamics. The accuracy of GPS data varies: consumer devices often achieve meter-level horizontal accuracy under good conditions; augmentation systems such as WAAS/EGNOS can improve precision, while professional methods like RTK or PPP can reach centimeter to decimeter level in favorable environments.

Limitations of GPS data arise from signal obstructions, multipath effects, atmospheric delays, and satellite geometry, especially in urban canyons or underground. Privacy considerations are important because location data can reveal sensitive information about individuals or organizations; appropriate consent, data protection measures and compliance with laws such as the European Union's GDPR are typically required for collection and use of GPStietojen.