Relationship between aerial photography division and administrative division

Domestic aerial photography standards require that aerial photography areas should be partitioned before route design, and then route design should be carried out in each partition.

Administrative division is a region divided by the state for the convenience of administration. Administrative divisions are also called administrative regions. The civil affairs department of the State Council is responsible for the specific management of the national administrative divisions. Other relevant departments of the State Council shall, in accordance with their respective responsibilities, do a good job in the administration of administrative divisions throughout the country.

Clustering a plurality of map sheets in the aerial photography area into one or more class groups according to the height difference limit value of aerial photography partition, wherein each class group comprises at least one partition composed of map sheets, and the height difference limit value is the allowable maximum height difference of aerial photography partition; In each class group, the adjacent partitions are merged, including: if the height difference between the highest point and the lowest point in the adjacent partitions is less than the height difference limit, the adjacent partitions are merged, and this combination based on the height difference limit is repeated until it cannot be merged; The merging also includes merging adjacent partitions if the height difference of the reference planes of the adjacent partitions is less than the reference plane difference threshold, and repeating the merging based on the reference plane difference threshold until the merging cannot be performed, wherein the reference plane difference threshold is an allowable maximum value of the height difference of the reference planes of two adjacent partitions.