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　　GPS Application 1. Measurement

　　GPS technology has brought a revolution to the surveying and mapping industry. Using carrier phase differential technology (RTK), on the basis of the carrier phase of the two observation stations in real time, it can achieve the accuracy of the centimeter level. Compared with traditional manual measurement methods, GPS technology has a huge advantage: L measurement accuracy is high. l is easy to operate, the instrument is small, and it is easy to carry. l all -weather operation. l No visual between the observation point. l The measurement results are uniform under the WGS84 coordinates, and the information is automatically received and stored to reduce the tedious intermediate processing link. At present, GPS technology has been widely used in the fields of land measurement, resource exploration, crustal movement, and cadastral measurement.

　　GPS application 2. Traffic

　　Industries such as taxis, car rental services, logistics distribution, etc. use GPS technology to track and schedule the vehicles to reasonably distribute vehicles, and respond to users' ride or requests at the fastest speed to reduce energy consumption and save operating costs. Implement the autonomous navigation of the vehicle. Civil aviation transportation through GPS receiving equipment, enabling the driver to accurately accurate the runway when landing, and at the same time, it can also make aircraft compact arrangements, improve airport utilization, and guide aircraft to enter the field safely.

　　GPS application three, rescue

　　Using GPS positioning technology, emergency dispatches can be made on fire police, ambulances, and police, and improving the response efficiency of emergency incidents such as fire, criminal scene, traffic accidents, and traffic jams. Special vehicles (such as banknote transport vehicles), etc., can alert and position the emergencies, minimize the loss. With the help of GPS, rescuers can conduct effective search and rescue on the disappearance of the sea, mountains, and deserts with poor conditions. Fishing vessels equipped with GPS devices can be positioned and alarm in time when there is danger, so that it can get rescue faster and even more.

　　GPS application 4. Agriculture

　　At present, developed countries have begun to introduce GPS technology into agricultural production, the so -called "precision agricultural farming". This method uses GPS for farmland information positioning, including output monitoring, soil sample acquisition, etc. The computer system decides the management measures of farmland land through analysis and processing of data. In the sprayer, so as to fertilize and spray the farmland plot accurately. Through the implementation of precision farming, it can reduce agricultural production costs as much as possible, effectively avoid waste of resources, and reduce pollution caused by fertilizer removal to the environment.

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