Analysis of Measurement Accuracy of Forest Area by Area Measuring Instrument

In recent years, the rapid development of mobile computing, the development of remote sensing technology, the continued maturity of GIS and GPS technologies and their continuous application in various industries have provided strong technical support for the adoption of embedded development of location-based geographic information services. The advent of handheld computers has become a remedy and extension of PCs and Internet networks in human life, which can meet people's need for "computing everywhere." The state is implementing a digital strategy that requires various industries to achieve information and digitalization, such as digital cities, digital transportation, digital forestry, and intensive farming. In these areas, remote sensing, GPS satellite positioning and other technologies are used to obtain information, and GIS systems are used to store and process information. With the help of computer networks and communications, information processing and analysis are finally achieved, decision-making basis is provided, and information is transmitted in real time. In order to verify the accuracy of the product's real-area measurement, this paper analyzes the results of repeated measurements over a series of different sizes of land under different observation periods and different interference conditions, and demonstrates in detail that area measurement instrument area measurement can achieve The accuracy of the situation, the relationship between area measurement accuracy and plot size, the results can be used to guide production practices.

Area measuring instrument area measurement relative accuracy and land area size have a certain relationship. In general, the larger the plot area, the higher the relative accuracy. The smaller the plot, the lower the relative accuracy. Due to the GPS positioning error, the use of the star source to measure the coordinates of the boundary points of the forest classes and small classes will cause errors. The more boundary points, the greater the error accumulation. Therefore, there is a certain relationship between the measurement error of the plot area and the number of measured boundary points. Specific performance in the same point of continuous observation for a period of time, the real area should be 0, due to GPS positioning errors make the area value is not 0, the specific size of the continuous observation at the same point in time and the distribution of airborne satellites.

The area measurement accuracy of the area measuring instrument is affected by many factors such as GPS positioning error, land size, forest and mountain sheltering. If the Xingyuantong Palm Forest Surveyor 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 parcel, the greater the relative error. Canopy closure affects the reception of GPS signals, which in turn affects area measurements. When equipped with micro-antennas, Xingyuantong can be positioned smoothly in woods with close to 1 degrees of cactus without affecting the accuracy of area measurement. The effect 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 4 satellites, this product, like other products, is difficult to locate and measure.

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