《Table 4 Layering and Naming of Basic Geographic Data》

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《1∶50000重庆市奉节县幅灾害地质图数据集》

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The layer number is composed of three or four characters.The basic geographic layer number is subject to the data layering and naming rules of digital line graphic map of the National Administration of Surveying and Mapping.The layer number of this dataset adopts 4 characters（see Table 4 for details）.The layer number of professional layer，except the basic geographic layer，is composed of the map category code and layer code，and the layer number is character（s）（see Table 5 for details） .