The method of triangle segmentation can be use to obtain the area of polygon . As shown in figure 3, Plot P1 and any two adjacent vertexs of the polygon can form a triangle.In the figure, we can obtain n-2 traingles in all. The area of each traingle can be obtained by the exerior product of the two plane vectors composed by the three vertexes. For example,area of is.
Because of the operation of vector exerior poduct each dependent small traingle has division of positive and negative.
In practical farmland area measurement, the start point GPS receiver obtained is usually used as coordinate origin. Then the plane righ-angle coordinates showed as figure 1 along latitude and longitude direction is built. After a new point received, the MCU calculate the long and latitude of the point, and then use formular 1 and 2 to calculate the coordinate of the point ralative to origin.
The method of triangle segmentation can be use to obtain the area of polygon . As shown in figure 3, Plot P1 and any two adjacent vertexs of the polygon can form a triangle.In the figure, we can obtain n-2 traingles in all. The area of each traingle can be obtained by the exerior product of the two plane vectors composed by the three vertexes. For example,area of is.Because of the operation of vector exerior poduct each dependent small traingle has division of positive and negative.In practical farmland area measurement, the start point GPS receiver obtained is usually used as coordinate origin. Then the plane righ-angle coordinates showed as figure 1 along latitude and longitude direction is built. After a new point received, the MCU calculate the long and latitude of the point, and then use formular 1 and 2 to calculate the coordinate of the point ralative to origin.
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