基于矢量评估单元的模糊综合评价在GIS中的实现

模糊综合评价与GIS空间分析功能的融合应用,使基于GIS的模糊综合评价显示出强大的优势。由于栅格模型计算方便,目前GIS模糊综合评价中基本采用栅格评估单元,但栅格单元由人为指定单元大小,其单元大小和形状不一、边界复杂、空间运算时隶属度与权重等属性结构设计较难实现,大大限制了其在模糊综合评价中的应用。本文介绍了在GIS中采用矢量评估单元实现模糊综合评价的基本方法,探讨了在矢量评估单元的属性结构中设计单元的隶属度和权重等属性的关键技术,为矢量评估单元在GIS模糊综合评价中的应用提供了经验。

Realization of fuzzy comprehensive evaluation based on vector evaluation graphics using GIS software

With the cross application of fuzzy comprehensive evaluation method and the spatial analysis function of GIS,the fuzzy comprehensive evaluation method based on GIS technology has great advantage.The raster unit size is closely relative to the evaluation result and have obscurity boundary,but it is widely used because of its easy calculation.Although the division of vector evaluation unit depends only on the factor boundary,with clear unit edge and favorable for evaluation result,the application of vector evaluation unit is limited just because of its uneven size and complex boundary,which causes difficult algorithm for fuzzy membershi Pvalue calculation and attribute structure design.To make full use of the advantage of vector evaluation unit,a practical method for realizing fuzzy comprehensive evaluation based on vector evaluation graphics was introduced in this paper,together with the key technology for fuzzy membershi Pvalue calculation and attribute structure design.