1. Programming algorithm using different types of geographic factors on the position, and check its related properties 2. Construct SQL expressions and expressions to find qualified according to the elements 3. According to spatial relationship query surface features, such as the distance , intersect, cover, contain, etc. 4. buffer use, check that all surface features within the buffer zone and its properties.

实验3.sln
实验3.suo
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实验3

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