The measurement of land area is often performed by the land department. The boundary point method is commonly used to calculate the area of ​​the enclosed area of ​​the block coordinates on the projection plane. The projection plane used in China is usually a Gaussian projection surface. This method is simple and practical, but when Using the national unified coordinate reference, when the elevation of the projection surface of the survey area is high, a large length deformation will occur in the far distance from the central meridian, causing a larger area calculation error. Therefore, it is necessary to discuss in the land survey work. Some other methods of measuring the area of ​​land were used to limit the effect of Gaussian projection deformation or uniform land area measurement. Land area measurement is a common problem encountered in industrial and agricultural production. Although mathematics provides many methods for calculating the area of ​​planar graphics, such as the cut-and-fill method, the integral method, etc., it is not convenient for some methods to be applied to reality. Nowadays, there is a GPS land area measuring instrument on the market. The measurement area is fast and convenient. It is a combination of global positioning technology, electronic technology and mathematical technology. Farmland area is one of the most basic data in agricultural production management. The size of the plots directly determines the input of production materials such as seeds, fertilizers, and pesticides. It is also the main basis for calculating the man-hours and charges for agricultural operations. Most of the traditional farmland area is measured with a tape measure, which is simple and practical, but it is only suitable for small-area rectangular fields. For large-area fields, it takes time and effort, is prone to errors, and it is difficult to measure the area of ​​irregular fields. GPS global satellite positioning system can provide real-time navigation and positioning information such as longitude, latitude, elevation, etc. It is one of the core technologies supporting the practice of precision agriculture. Using the positioning function of GPS, it is possible to measure the coordinates of various points of the farmland, thereby providing the possibility of calculating the distance, area and other data of farmland by mathematical methods. The GPS module has developed a portable field area measuring instrument that enables fast GPS positioning measurements on the area of ​​any shape of field. In the management of precision agricultural production, rapid and real-time measurement of farmland area is necessary. Traditional measurement techniques are difficult to quickly measure the area of ​​irregularly shaped farmland and cannot meet the requirements of precision agriculture. The development of the acre measurement instrument provides a new method for rapid measurement of farmland area. The main characteristic of the measuring instrument is to use GPS for positioning. The measurement speed is fast. It can measure the area of ​​arbitrary shape fields and has high measurement accuracy, thus providing accurate basis for production management of precision agriculture and operation charge of agricultural machinery.
Fused deposition modeling falls under the wider Material Extrusion umbrella. Like Selective Laser Sintering, FDM uses thermoplastics to print parts. The difference between these two however is that FDM uses filaments, whereas SLS uses powders. Stereolithography differs from both as it uses thermosets, called resins.
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Area measuring instrument GPS positioning more convenient