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.
we have pure bronze flange and bi-metallic flange,we also produce nibco flange,the material is CC491K and CC499K,bronze flange,bi-metallic flange,nibco bronze flange,gunmetal flange
bronze flange,bi-metallic flange,nibco bronze flange,gunmetal flange
Taizhou Runde Company , https://www.zjpressfittings.com