共查询到15条相似文献，搜索用时 171 毫秒
1.
GIS数据质量的模糊综合评判分析 总被引：3，自引：0，他引：3
GIS数据在生产过程中由于各方面的原因,常使数据质量的优劣具有模糊性,给数据质量评价带来困难,影响了GIS应用。本研究尝试将模糊数学概念引入GIS数据质量评价中,用模糊数学理论建立GIS数字化产品质量评估模型。介绍了模型中评判因子、评价集、权重确定和模糊集合隶属函数的建立过程,并举例说明应用模糊综合评判方法对矢量化产品的评判过程。该方法有效地解决了GIS数据质量优劣的客观定性问题,使矢量化数据产品的评判简便、直观,保证了数据质量。 相似文献
2.
飞机积冰防御系统及其模糊综合评判 总被引：2，自引：0，他引：2
基于系统安全分层次模型(Reason模型),设计出减少积冰对飞行安全影响的积冰防御分层次系统,利用层次分析法(AHP法)确定测评指标权重集,并采用模糊综合评判法建立了积冰防御系统综合评估模型,旨在避免人为因素的主观片面性.计算结果表明,系统综合评判等级为较好. 相似文献
3.
为开展江汉平原浅层地下水防污性能评价,以江汉平原沙洋-旧口地区浅层地下水为研究对象,针对传统DRASTIC模型评价指标存在关联性、权重主观性强、评分值缺乏连续性以及评价结果缺乏实测数据验证等缺点,考虑研究区实际条件,建立了基于改进DRASTIC模型的模糊综合评价模型,并利用研究区浅层地下水关键污染因子Cl-、NO3-和NH4+实测数据验证了模型的准确性和可靠性。该模型使用包气带黏性土厚度代替包气带介质指标,含水层厚度代替含水层介质指标、土壤饱和渗透系数代替土壤介质指标,采用全定量评价指标体系,评价指标更加客观、合理;采用三标度层次分析方法确定各评价指标权重,减少了传统DRASTIC模型人为确定权重的主观性;在改进的DRASTIC模型基础上,引入模糊数学理论,以隶属度函数代替传统DRASTIC模型固定评分值,克服了传统DRASTIC模型使用定额评分带来的不连续性。模糊综合评价结果表明:研究区浅层地下水防污性能整体表现为差-较差,占研究区总面积的76.53%。研究结果可为平原地区开展浅层地下水脆弱性评价提供方法参考,为江汉平原浅层地下水污染防治工作提供科学依据。 相似文献
4.
为了查清活动断裂对公路的影响,总结了宁夏地区9条全新世活动断裂的基本特征和活动性,确定了评价和预测活动断裂对公路工程影响的指标体系,并建立了分级标准。采用优先排序法对指标进行筛选和优化,运用主成分分析法确定权重,选用多级模糊综合评判法建立了评价模型。以ARCGIS9为平台,建立了宁夏地区活动断裂空间数据库,运用矢量叠加运算实现了宁夏地区活动断裂对公路影响的现状评价,运用栅格叠加运算实现了宁夏地区海原活动断裂带对公路影响的预测评价。预测结果表明,宁夏地区对公路影响大的海原活动断裂面积为12.34 km2,占全区总面积的1.0%;影响较大的为271.28 km2,占总面积的21.4%;影响中等的为400.05 km2,占总面积的31.6%;影响小的为585.04 km2,占总面积的46.0%。 相似文献
5.
以县域为研究对象,从影响生态环境的自然因素、人类干扰因素两个方面出发,确定了包括目标层-准则层-指标层在内的系统化评价指标体系;打破传统的以行政区域为单元分析的模式,通过GIS网格技术和模糊综合评价多属性特征分析,提出了将地理信息系统技术(GIS)和AHP-模糊综合评价模型互相融合,以网格单元进行生态环境脆弱性综合评价... 相似文献
6.
7.
从资源合理性、经济可行性、社会可接受性3个方面,建立了土地可持续利用综合评价指标体系。采用层次分析法确定了指标权重,应用模糊数学中的隶属函数对指标体系中的各项指标进行无量纲化处理,然后用加权法求得临沂市1995—2004年的土地可持续利用水平,用协调度模型求得临沂市土地可持续利用的协调度,运用障碍度模型,分析了各项指标的障碍度。 相似文献
8.
从资源合理性、经济可行性、社会可接受性3个方面,建立了土地可持续利用综合评价指标体系.采用层次分析法确定了指标权重,应用模糊数学中的隶属函数对指标体系中的各项指标进行无量纲化处理,然后用加权法求得临沂市1995-2004年的土地可持续利用水平,用协调度模型求得临沂市土地可持续利用的协调度,运用障碍度模型,分析了各项指标的障碍度. 相似文献
9.
从资源合理性、经济可行性、社会可接受性3个方面，建立了土地可持续利用综合评价指标体系。采用层次分析法确定了指标权重，应用模糊数学中的隶属函数对指标体系中的各项指标进行无量纲化处理，然后用加权法求得临沂市1995--2004年的土地可持续利用水平，用协调度模型求得临沂市土地可持续利用的协调度，运用障碍度模型，分析了各项指标的障碍度。 相似文献
10.
本文采用模糊数学综合评判法,以多个指标比较准确地刻划出矿产资源的本质属性,运用两种模糊数学模型对矿产资源进行综合评价并对两个实例计算分析.得到了令人满意的效果.最后,评述了本文采用的两种模糊数学模型的特点和评价中应注意的问题. 相似文献
11.
Urban Construction Land Suitability Evaluation Based on Improved Multi-criteria Evaluation Based on GIS （MCE-GIS）： Case of New Hefei City,China 总被引：2，自引：0，他引：2
Urban construction land suitability evaluation （UCLSE） is a complex system engineering and the basis for rational use of the limited urban land resources in China. It has an important practical value on urban construction land use planning and management from the angle of methodology. As a widely used technique, traditional multi-criteria evaluation based on GIS （MCE-GIS）, is not suitable for UCLSE. This study develops an improved MCE-GIS method which could be more suitable for UCLSE based on urban complex ecological system theory and the summary of the shortcomings of traditional MCE-GIS. The improvements include three aspects： a composite evaluation index system rather than natural indexes alone, an index weight calculated by using fuzzy Analytic Hierarchy Process （AHP） method rather than the common AHP method, and the integrated overlay rule, which includes selecting the minimum value, weighted linear combination （WLC） and simple summation. The main advantage of this improved technique is that it can make UCLSE more comprehensive, more operational and more reasonable. It can provide a scientific basis for decision making in the planning and management of urban construction land use. The improved MCE-GIS system has been adopted in the New Hefei City, Anhui Province, China. Based on the results of UCLSE in New Hefei, three functional areas including construction-appropriate areas, construction-restricted areas and construction-forbidden areas could be worked out, in which 36.90% of the total study area could be developed as urban construction land and the remaining 63.10% should be protected as reserves land or as ecological land. Furthermore, the results can orovide scientific decision suooort for spatial planning and eco-environment nrotection in New Hefei. 相似文献
12.
13.
依据多目标区域地球化学调查资料,对土地环境质量综合评价方法进行探讨,建立评价模型。提出土地环境质量综合评价是土壤内部指标分等、外部指标定级,整合全部评价因素的新观点。采用相关系数、半方差函数进行指标筛选,层次分析法确定参评指标权重,通过隶属度函数模型将土壤不同含量单位的指标纳入同一评价体系形成内部因素,叠加区域地下水、农作物质量等外部因素,建立土地质量综合评价模型。根据模型对山东半岛蓝色经济区土地环境质量进行综合评价,结果表明:山东半岛土地可分为优质、优良、良好、中、差5等20级,其中可作绿色(111和121级)及无公害(211和221级)食品生产基地的土地占62.60%;需农业种植结构调整的512和522级土地面积267.54km2,多位于矿区(金矿、石墨矿、铜铁矿)周边或紧邻城镇地带。土地环境质量综合评价方法及模型的建立对山东其他地区基本农田保护和土地质量等级划分具有一定借鉴意义。 相似文献
14.
Regional ecological security and diagnosis of obstacle factors in underdeveloped regions: a case study in Yunnan Province,China 总被引：1，自引：0，他引：1
In order to clarify regional ecological security status and formation mechanism of regional ecological security barriers in underdeveloped regions of China, we took Yunnan province as a case to evaluate its regional ecological security by using entropy matter-element model, comprehensive index and GIS spatial method, and we diagnosed its obstacle factors through obstacle degree model. We found a low overall level of regional ecological security in Yunnan. Only Kunming fell into the good level, 68% of the regions were below the critical safe level. For the vast majority of regions in Yunnan, their regional ecological security was unstable. The indexes related to per capita resources, geological and topography environment, economic, and technology were at the unsafe or dangerous level. The indexes related to urban expansion, level of income, cultivated land quality were at the level of critical safety. The indexes concerning urban management capacity, air quality and water environment were at the good or ideal level. Yunnan’s regional ecological security was not good due to natural obstructive environment itself, simultaneously lower backward economic and social level restricted the ability of ecological security response to manage ragile ecological environment. The results of the composite index were roughly consistent with those of the entropy weight matter-element model. The mean values of the classification index, from high to low, were: the state index > the response index > the pressure index. The state index and the response index had a significant mutual promotion to each other. The regions with good composite index, state index and response index mainly distributed in the central regions of Yunnan Province. Spatial autocorrelation of regional ecological security level in Yunnan was not obvious. Water resources, economic and social development were main obstacle factors of the regional ecological security. When distinguishing with obstacle type, Kunming belonged to natural ecological environment barrier type, while other regions belonged to economic and social barrier type. 相似文献
15.
地质环境评价可查明地质环境状态,有利于资源合理开发,有效减免地质灾害的发生。本文依据焦家金成矿带的地质环境特点及现状,选取地形地貌、工程地质类型、区域地壳稳定性、地下水环境质量、海水入侵、采坑及尾矿库、地面塌陷及伴生地裂缝、崩塌等12个评价指标,借助MapGIS强大的空间分析及信息处理能力,绘制相应的专题图,采用层次分析法（AHP）确定各指标的评价权重,采用综合指数法,对研究区地质环境进行评价,将焦家金成矿带地质环境质量划分为环境差区、环境较差区、环境一般区、环境良好区4个等级并进行分析说明。研究结果可为矿山环境的保护与修复提供对策和建议,为半岛蓝色经济区建设提供基础地质数据和科学依据。 相似文献