The land area is the most basic data and basis for land management. As the land use rights and land area recorded in the ownership certificate issued by the land management department, it has legal effect and should be serious and scientific. Any measurement has errors and area measurement. There are also errors. Understanding and analyzing the errors in area measurement is a reflection of the serious and scientific nature of land management. The area measuring instrument is an important instrument for measuring the land area. It also has some errors, but it is much smaller than other methods.
As far as the current area measurement methods are concerned, they can be divided into two types. One is to obtain the coordinates and their relative position of the sites in the site of the block, and then calculate the area of ​​the block. This method is called the calculation area method; Topographic maps, detailed land use maps, orthographic projection maps or cadastral maps, and real estate maps are computed using methods such as planimeter methods, grid methods, or computer scans. This method is known as the area-of-volume method. By calculating the area derived from the area method, the cause of the error is the measurement error of each point of the limited boundary point, that is, the error in the boundary point point, which is independent of the calculation process. The error source method has two sources. The first is the error caused by the land boundary line from the field to the topographic map, the detailed land use map, the orthographic projection map or the cadastral map, ie the error in the point of the consecutive closed boundary line. The resulting area error, where the error is represented by mi, and the second one is the error generated by the method of planimeter method, grid method, or computer scan method for the measurement of the plot plot, and the medium error is expressed in m. Since the two errors exist independently of each other.
The error in the area of ​​the same block is proportional to the error in the measurement of the boundary point. If the area is calculated from the map, the larger the scale, the smaller the error in the point on the map. Therefore, the measurement is performed on the large scale map. The area error ratio is smaller than that on the small scale graph. Therefore, the area should be measured on a large scale map.
Area measurement instrument in the map area measurement, it is best to measure the inflection point (boundary point) coordinates or relative position calculation area, the error is smaller than the method of measuring the area with the method of the quadrature instrument method, because the former is less a measure The error generated by the instrument itself, and it is easy to use equation (3) to calculate the area error more accurately.
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