The frequency degree of being visualized was determined by using the land utilization map, numerical model of topography and the incident angle of sight.
通过地形及土地利用图、数值地形模型和视线入射角来确定景观的被视频度；
Then I talk about the location model of the urban land utilization in condition of the complete competitive and non-eternal effect, which is the basic theory model.
然后介绍了在完全竞争和无外部效应条件下城市土地利用的区位模型，这是最基本的理论模型；
Then based on this, we use the USLE model to simulate how different land utilization patterns influent the soil erosion.
并在此基础上，采用USLE模型，模拟了不同土地利用格局对土壤侵蚀的影响。
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