GPS acre measurement instrument working principle GPS acre measurement instrument by high-precision GPS positioning system, precise area calculation method, realizing any irregular area of ​​real-time testing, dynamic graphic display and data intelligent processing and storage. Applicable to the measurement of areas such as farmland, green areas, forests, water areas, hillsides, etc. One measurement can simultaneously obtain data such as measurement area, perimeter, distance, slope, etc. The measured area graph and all measurement data can be recalled at any time for easy file retention. It is a convenient measurement tool for agricultural, forestry, water conservancy, soil management, and agricultural operations.
The GPS global acre system used by the GPS acre measurement instrument can provide real-time navigation and positioning information such as longitude, latitude, elevation, etc. The positioning function of the GPS can be used to obtain the coordinates of each point, and the distance, area and other data can be calculated by mathematical methods. .
Since the earth is an ellipsoid, in order to accurately calculate the distance or area, it is generally converted into planar coordinates by means of projection. In China, Gaussian-Kriging projection is usually used to convert large-scale maps. However, the projection method is very complex and difficult to implement in single-chip microcomputers. To simplify the calculation, we consider the earth as a true sphere. Take the radius of the earth is 6371116m, you can convert it into plane coordinates:
Where: R is the radius of the Earth, x is the longitude/m, and y is the latitude/m. Then at the Y longitude of the Earth's surface, the square area where the longitude difference and the latitude difference are one degree each is:
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