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基于GIS的城市地下空间综合评价中大多采用栅格单元法,需事先划分边界固定的单元,单元大小控制着评价精度,经常在同一单元中产生数据矛盾或数据缺乏,评价成果的图形表达呈锯齿阶梯状;亦有人采用改进型可变栅格单元法,可变单元法通过对某些重点或敏感部位加密剖分,较好地解决了数据冗余与精度要求的矛盾,近来得到广泛应用;而矢量单元法完全基于各评价因子的实际边界,具有单元边界清晰、评估结果准确的特点,但由于其单元大小和形状不一、边界复杂、空间运算难以实现。本文依据深圳市宝安区地下空间资源质量评估实际工程,介绍了在GIS平台中采用矢量单元法实现模糊综合评价的一种新方法,指出了该方法评价计算的关键步骤和属性数据库结构设计的实现技术,为矢量单元法的利用提供示范。
Grid-based method is mostly used in the comprehensive evaluation of urban underground space based on GIS. The cell with fixed boundaries needs to be divided in advance. The cell size controls the evaluation accuracy, often resulting in data inconsistency or lack of data in the same cell. The graphical representation of the evaluation results is jagged Ladder-like; some people use improved variable grid element method, variable element method through the key points or sensitive parts of encryption and dissection, to better solve the data redundancy and accuracy requirements of the contradiction has been widely used recently; However, the vector unit method is based on the actual boundary of each evaluation factor. It has the characteristics of clear unit boundaries and accurate evaluation results. However, due to the different unit sizes and shapes, the boundary is complex and space operations are difficult to realize. Based on the actual project of underground space resource quality assessment in Bao’an District of Shenzhen City, this paper introduces a new method of fuzzy comprehensive evaluation using vector element method in GIS platform, and points out the key steps of this method evaluation calculation and the realization of attribute database structure design Technology, to provide a demonstration of the use of vector unit method.