In recent years, the development of mobile computing and remote sensing technology, and the continuous maturity of GPS technology, the application of various industries is also in-depth, providing powerful technical support for the use of embedded development of location-based geographic information services. The country is implementing a digital strategy that requires informationization and digitization in various industries, such as digital cities, digital transportation, digital forestry, and intensive agriculture. These fields use remote sensing, GPS satellite positioning and other technologies to obtain information, use GIS system to store and process information, and use computer network, communication and other means to finally realize information processing and analysis, provide decision-making basis and carry out real-time information transmission. The area measuring instrument plays an important role in the measurement of agricultural area, and the relevant results are also accurate and credible.
The area measuring instrument uses GPS single point positioning to measure the coordinate of the small class boundary point, and the principle is the same as the spatial distance retreat in the measurement. The position of the airborne GPS satellite is known at any instant. As long as the satellite is used to observe four satellites in the air at the small-border boundary feature point, and the distance (pseudo-range) of the satellite from the observation point to the point to be measured is obtained, the solution can be solved. The coordinates of the point to be measured. Because GPS satellites operate independently in the air, the GPS time of each satellite is corrected to become a unified UTC time. Ground users can turn on Xingyuantong for observation and location whenever and wherever needed. The distance from the satellite to the satellite is not the actual distance, including the error caused by the clock difference between the satellite clock and the satellite source receiver.
The accuracy of the area measuring instrument is affected by many factors such as GPS positioning error, block size, forest and mountain cover. As long as the Xingyuantong Palm Forest Survey Instrument can accept more than 4 satellites, it can effectively locate and complete the area measurement. When the plot area is less than 600m2, the area measurement error will exceed 5%. The smaller the plot, the greater the relative error. Canopy closure affects the acceptance of GPS signals, which in turn affects area measurements. When equipped with a miniature antenna, Xingyuantong can be positioned smoothly in a forest with a canopy closeness of 1, without affecting the area measurement accuracy. The impact of the mountain on satellite signals is an issue that cannot be overcome by any GPS device. In the Grand Canyon, because of the inability to receive signals from four satellites, the product is as difficult to locate and measure as other products.
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