第四部分：榆阳区土地利用动态变化分析。
Part four: Study on land use dynamic change in Yuyang suburb.
在该模型的基础上，还探讨了时态查询、房产动态变化分析等问题。
On the basic of model, this paper discusses the problems such as tense query and real estate dynamic change analysis.
通过对酒泉市耕地的动态变化分析，得出影响酒泉市耕地变化的因素是自然因素和社会经济因素。
By analyzing the dynamic changes of cultivated land in Jiuquan City, it was found that the factors of influencing the cultivated land changes were the natural and economic factors.
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