There are several issues that should be paid attention to when applying the method of numerical pumping. The first is the determination of the survey object and the overall scope, because the size of the overall scope directly relates to the degree of detailed land area and the level of work efficiency. Applying the method of number sampling in the county-level agricultural divisions is more appropriate for the county as a whole. This determination of the whole can ensure that the area-of-area measurement instrument has relatively accurate and reliable accuracy for all types of land in the county without causing too much work. Large and increase a lot of manpower and material resources.
Before the field survey is carried out, the land area measuring instrument must clearly define the classification standards for various types of land. For some confusing areas, it should be fully studied and discussed. If necessary, all the investigators should be organized to uniform the land area on the field site. Awareness, this is one of the important measures to ensure the quality of sample surveys. As for the specific distribution of various types of land area, it can still be solved by topographic map adjustment according to the method of measuring the area of ​​land, and the area of ​​the block for drawing the results should be based on sampling all types of land in the whole county. difference. Only in this way can we achieve the goal of both checking the quantity of various types of land and finding out the specific distribution of land area.
In addition, the land area measuring instrument recognition ability and operation training and assessment are also an important measure to ensure the quality of the land area measurement. Because the correctness of the location of the instrument reading location is directly related to the correctness of the area of ​​the area. Therefore, all personnel participating in the survey must participate in the training and assessment of topographic map recognition. Only on-site assessment of qualified personnel can participate in the measurement of outdoor area.
Before the field survey is carried out, the land area measuring instrument must clearly define the classification standards for various types of land. For some confusing areas, it should be fully studied and discussed. If necessary, all the investigators should be organized to uniform the land area on the field site. Awareness, this is one of the important measures to ensure the quality of sample surveys. As for the specific distribution of various types of land area, it can still be solved by topographic map adjustment according to the method of measuring the area of ​​land, and the area of ​​the block for drawing the results should be based on sampling all types of land in the whole county. difference. Only in this way can we achieve the goal of both checking the quantity of various types of land and finding out the specific distribution of land area.
In addition, the land area measuring instrument recognition ability and operation training and assessment are also an important measure to ensure the quality of the land area measurement. Because the correctness of the location of the instrument reading location is directly related to the correctness of the area of ​​the area. Therefore, all personnel participating in the survey must participate in the training and assessment of topographic map recognition. Only on-site assessment of qualified personnel can participate in the measurement of outdoor area.
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