Modèles géostatistiques de concentrations ou de débits le long des cours d'eau     

Chantal de Fouquet  Caroline Bernard-Michel 《Comptes Rendus Geoscience》2006,338(5):307-318

Estimating concentrations or flow rates along a stream network requires specific models. Two classes of models, recently proposed in the literature, are generalized, to the intrinsic case in particular. We present a global construction by ‘streams’, i.e. on the whole set of paths between sources and outlet. Combining stationary or intrinsic one-dimensional random functions leads to stationary or intrinsic models on segments, with discontinuities at the forks. A construction from outlet to sources, leads to stationary or intrinsic models on each stream, without any discontinuity at the forks. The linear variogram is found as a particular case. The extension to the linear model of coregionalization is immediate, allowing a multivariate modelling of concentrations. To cite this article: C. de Fouquet, C. Bernard-Michel, C. R. Geoscience 338 (2006).  相似文献   

A Decision Support System for the Evaluation of Eco-engineering Strategies for Slope Protection     

S. B. Mickovski  L. P. H. Van Beek 《Geotechnical and Geological Engineering》2006,24(3):483-498

A decision support system (DSS) has been developed to assist expert and non-expert users in the evaluation and selection of eco-engineering strategies for slope protection. This DSS combines a qualitative hazard assessment of erosion and mass movements with a detailed catalogue of eco-engineering strategies for slope protection of which the suitability is evaluated in relation to the data entered. The slope decision support system (SDSS) is a knowledge based DSS in which knowledge is stored in frames containing rules that can evaluate the available information for a project, stored as project specific information (PSI) in a data file. The advantages of such a system are that it accepts incomplete information and that the qualitative nature of the information does not instil the user with a sense of unjustified exactitude. By its multidisciplinary and progressive nature, the DSS will be of value during the initial stages of an eco-engineering project when data collection and the potential of different eco-engineering strategies are considered. The accent of the output of the DSS is on the application of eco-engineering strategies for slope protection as an environmentally-friendly solution aiding sustainable development. For its acceptance within the engineering community, the DSS needs to prove its predictive capacity. Therefore, its performance has been benchmarked against successful and unsuccessful cases of slope stabilisation using eco-engineering. The target audience and the areas of application of this DSS are reviewed and the strategies for further development in this area suggested.  相似文献   

Comparing the consistency of expert land cover knowledge     

《International Journal of Applied Earth Observation and Geoinformation》2005,7(3):189-201

  相似文献   

Practising geographical knowledge: fields, bodies and dissemination   总被引：1，自引：0，他引：1  

J.D. Dewsbury  & S Naylor 《Area》2002,34(3):253-260

In this article we make a case for a renewed emphasis upon some of the generic, albeit often tacit, spaces of practice that we share across our sub–disciplinary boundaries. In this we seek to emphasize the ways in which everyday actions make up the grander facades of institutional agendas, empirical projects and disciplinary schools of thought. To achieve this we trace the performance of disciplinary contours and identities across three important sites: the field, the body and the act of dissemination. There are, we will argue, significant commonalities that bind us as disciplinary practitioners in terms of how we perform within and across these sites, and indeed, how we join them up through our practices.  相似文献   

依法行政做好防震减灾工作--纪念《中华人民共和国防震减灾法》实施5周年     

阎正萃  张跃平  郄晓芸 《山西地震》2003,(2):1-3

从立法、法制宣传、建立健全规章制度和科学规范的管理程序、公正严格执法、执法监督和法制工作队伍建设等6个方面，论述了做好防震减灾依法行政工作的重要性，指出。只有依法行政，才能保障防震减灾工作的顺利发展。  相似文献   

土地管理办公自动化系统的设计与实现   总被引：6，自引：0，他引：6  

韩琼 《武汉大学学报(信息科学版)》2003,28(3):372-375

深入分析了土地管理的工作流程、建立了土地办公自动管理的数据库子系统，在此基础上研制出各种业务系统，并努力实现第三代OA——知识管理的层次和目标。  相似文献   

基于规则知识的空间推理研究   总被引：5，自引：0，他引：5  

沙宗尧  边馥苓  陈江平  江聪世 《武汉大学学报(信息科学版)》2003,28(1):45-50

在一般空间推理的基础上 ,提出了空间推理扩展 ,即基于规则知识的空间推理。该方法结合了人工智能的基本原理 ,继承并发展了空间推理的方法学 ,其推理过程建立在空间知识与模型集成的基础上 ,以规则知识为推理控制 ,因而更符合实际 ,具有更大的灵活性。实例验证了本方法的正确性。  相似文献   

无拓扑关系下GIS图形编辑联动的解决方法   总被引：2，自引：0，他引：2  

刘守军  黄慧  张燕江 《武汉大学学报(信息科学版)》2003,28(1):111-114

给出了一种解决层内联动以及层间联动的方法，对于实际处理无拓扑关系下编辑联动的问题有较好的利用价值。  相似文献   

基于先验知识的GIS路径寻优算法   总被引：2，自引：0，他引：2  

张连蓬  刘国林  江涛  李云岭  季民 《测绘科学》2003,28(3):27-29

针对地理信息系统中特定的两点路径寻优问题,提出了一种基于先验知识的快速搜索算法。该算法模拟人脑寻找路径的思维过程,首先针对实际问题建立先验知识库,在路径搜索过程中,利用知识库中的信息剪去不可能的搜索路径,构造出简化的查询树,从而大大提高最优路径的搜索速度。  相似文献   

云南省卫星监测火点三级定位系统   总被引：1，自引：1，他引：1       下载免费PDF全文

赵红旭 《气象》1997,23(7):10-12

云南省卫星监测火点三级定位系统，是根据云南护林防火需求，按照地理信息系统设计思想，研制出的一套将火情快速定位到地、县、乡的计算机定位系统，实践表明，该系统可以充分发挥卫星监测林火的快速优势，特别适合山区护林防火的需求。  相似文献