基于．NET Compact Framework的移动GIS软件开发   总被引：1，自引：0，他引：1  

严永斌  吴健平 《测绘与空间地理信息》2008,31(4)

为了满足移动人群对地理信息的需求,使用.NET Compact Framework底层开发移动GIS系统,通过将GIS,GPS与遥感图像的结合,实现在PDA上的地图加载、GPS位置显示、兴趣点信息查询和路径分析.以华东师范大学校园移动GIS系统的开发为例,着重介绍利用.NET Compact Framework开发移动GIS中一些关键技术的处理与实现.  相似文献   

新型锚管构架在边坡加固中的应用     

孙书伟  朱本珍  郑波  张军伟 《工程地质学报》2008,16(3):371-375

针对边坡病害治理工程往往存在工期紧、施工场地受限等特点,研究了一种用于边坡加固的新型结构,即锚管构架。介绍了锚管构架的组成和特点,基于Winkler理论,建立了锚管构架的力学计算模型,并编制了弹性杆系有限元计算程序。将锚管构架应用于西气东输管道沿线某填土边坡的病害治理中,结果表明,按照Winkler理论建立的计算模型较好的反映了锚管构架实际的受力和变形形态,输气管道的安全运营得到了保障。  相似文献   

Modeling of the river ecological status with macrophytes using artificial neural networks     

《Limnologica》2017

Biomonitoring methods based on macrophytes have been used mandatorily in the assessment of freshwaters since the implementation of the Water Framework Directive (WFD). The Macrophyte Index for Rivers (MIR) was developed in Poland for the monitoring of running waters under the WFD requirements. This index shows the degree of river degradation under the influence of water pollutants, especially nutrients. The aim of the present study was to determine the relationship between the MIR and various hydrochemical parameters using artificial neural networks (ANNs). Physico-chemical parameters of water (monthly results for the whole year), which were derived from 147 lowland river survey sites, all located in Poland, were applied to model the MIR values. Water quality variables were determined over three timeframes: the annual average; the average for the vegetation period; and the average for the summer period. Quality of the networks was assessed using coefficient of determination (R²), Nash-Sutcliffe efficiency (NSE) and root mean square error (RMSE). The best modeling quality was obtained for yearly average values of water quality parameters. The quality statistics were: R² = 0.722, NSE = 0.721 and RMSE = 0.056 (training dataset); R² = 0.555, NSE = 0.533 and RMSE = 0.101 (validation dataset); R² = 0.650. NSE = 0.600 and RMSE = 0.089 (testing dataset). This indicates that macrophytes reflect the whole year impact of pollution, whereas summer.  相似文献   

江苏省地震监测信息化架构研究   总被引：1，自引：0，他引：1  

戴波  刘红桂  雷利  江昊琳  卢永 《中国地震》2019,35(2):367-380

在全面梳理江苏省地震监测业务体系的基础上,运用信息工程及信息资源管理的理念和方法,给出了一种江苏省地震监测信息化架构模型,以期对地震监测体系信息化管理具有一定参考作用,并为信息系统设计与开发提供全程统一的规划。  相似文献   

Abiotic Stream Classification as a Basis for a Surveillance Monitoring Network in Austria in Accordance with the EU Water Framework Directive     

R. Wimmer  A. Chovanec  O. Moog  M. H. Fink  D. Gruber 《洁净——土壤、空气、水》2000,28(4):177-184

This study presents the 26 major surface water types established in Austria in accordance with the draft of the EU Water Framework Directive (WFD). These types are made up of so‐called aquatic landscape units and large rivers. The 17 aquatic landscape units were defined using a database in which all Austrian running waters with a catchment area greater than 10 km^[2] were described according to the following typological features: size of catchment area, altitude of catchment area and confluences, stream order, geology, zoogeographical regions (ecoregions), and subregions. At running waters with gauges, a classification according to flow regimes was carried out. Large rivers were defined as running waters with a stream order ⩾7 and/or a catchment area > 2500 km² and/or with an average flow >50 m³/s. These major types represent, inter alia, the basis for the establishment of a surveillance monitoring network as required by the WFD.  相似文献   

Paradigmatic responses of marine benthic communities to different anthropogenic pressures, using M-AMBI, within the European Water Framework Directive   总被引：3，自引：0，他引：3  

Angel Borja  Iñigo Muxika  & José Germán Rodríguez 《Marine Ecology》2009,30(2):214-227

The use of AMBI and M-AMBI in benthic quality assessments, within the European Water Framework Directive (WFD), has increased dramatically in recent years. M-AMBI is a multivariate tool, which incorporates AMBI, richness and Shannon diversity within the assessment. The response of this approach to different human pressures in coastal and estuarine waters has been investigated for the Basque Country (Northern Spain). In this contribution, several paradigmatic examples of these applications to different water bodies are presented. The time-series extend to samples collected between 1995 and 2007, showing the evolution of M-AMBI values under different pressures, i.e. urban and industrial discharges, dredging and disposal of sediments, and engineering works (such as land reclamation or marina construction), and, in addition, for illustrating the benthic quality recovery after positive actions have been undertaken, i.e. the removal of point-source discharges or water treatment programmes. In most cases, M-AMBI responds to these pressures as expected, with decreases in the ecological status immediately following the pressure. Conversely, when a pressure is removed, the recovery takes between 2 and 15 years, depending upon the intensity of the pressure and the characteristics of the water body. M-AMBI has been intercalibrated previously in coastal waters. After intercalibration in transitional waters, M-AMBI will be able to be used in the integrative quality assessment of European water bodies.  相似文献   

Benthic indicators and index approaches in the three main estuaries along the French Atlantic coast (Seine, Loire and Gironde)     

Jean-Claude Dauvin  Guy Bachelet  Anne-Laure Barillé  Hugues Blanchet  Xavier de Montaudouin  Nicolas Lavesque  & Thierry Ruellet 《Marine Ecology》2009,30(2):228-240

The three main estuaries in the French Atlantic coast – the Seine, Loire and Gironde, all with high tidal regimes – are interfaces between the continental and the coastal ecosystems. The Seine and Gironde are highly contaminated, whereas the Loire remains in a more natural state. Both the Seine and Gironde have suffered from harbour construction, and as a result, their biological units are extremely compartmentalized. Benthic species and communities have adapted to tolerate temporal physical and chemical changes ( e.g. salinity, substrata, depth, and levels of fine particles and oxygen) and human activities ( e.g. dredging, shipping traffic, and habitat reduction). Although numerous bio-indicators and indices are used to define the ecological quality status (EcoQS) of coastal waters, very few of them were developed specifically for environments with a mosaic of conditions and salinity levels, including freshwater. The main problem appears to be that all the indices for determining anthropogenic stress examine the abundances of stress-tolerant species, which may also be able to tolerate natural stressors such as those occurring in estuaries. This paper takes a look at the development status of the benthic indicators and index approaches used in the three main estuaries along the French Atlantic coast. In addition, it examines the adaptation of the different benthic indicators to the taxonomic sufficiency principle, and the adaptation of the Benthic Opportunistic Polychaetes Amphipods index (BOPA) and the Benthic Opportunistic Annelida Amphipod index (BO2A) for use in the freshwater zones of transitional waters ( i.e. up to the upper limit of the tidal range). Several perspectives are discussed in light of the diverse disturbances and the heterogeneity of such stressed zones, such as the use of multimetric and scoring approaches.  相似文献   

中国数字海洋的总体技术系统框架   总被引：9，自引：0，他引：9  

叶仰明  黄加棋 《海洋科学》2001,25(5):1-4

提出了中国数字海洋的总体技术框架。讨论了建设中国数字海洋所要解决的一些问题：（1）基础软件平台的选择，当前应先用WebGIS，今后进一步发展方向应是Object WebGIS；（2）讨论数字地球中海洋和陆地的不同；（3）为了解决互操作问题，数字海洋的核心GIS要采用OpenGIS规范和将要建立的国家信息系统标准；（4）使用移动Agent,Web mining,Data mining技术；（5）提出Metadata的体系结构；等等。  相似文献   

Integrated water resource management and institutional integration: realising the potential of spatial planning in England   总被引：1，自引：0，他引：1  

SUE KIDD  DAVE SHAW 《The Geographical journal》2007,173(4):312-329

This paper explores the various dimensions of integration that need consideration in developing appropriate institutional arrangements for integrated water resource management (IWRM), drawing upon both IWRM and spatial planning sources. As a result, a framework of integration in IWRM is set out. This is then used to consider the strengths and weaknesses of the new spatial planning system in England, and its potential to contribute to IWRM activities that are being developed, partly in response to the European Union Water Framework Directive. From this analysis it is argued that, taken overall, spatial planning is well placed to meet these challenges and it could in fact play a much more central role than is currently envisaged. An alternative model for IWRM in England is set out which sees the new river basin management plans as integral, rather than parallel, to the spatial planning system.  相似文献   

多维动态地理空间框架数据的构建   总被引：15，自引：0，他引：15  

陈军 《地球信息科学学报》2002,4(1):7-13

地理基础框架数据是数字化地理空间基础框架的重要组成部分。迄今为止 ,人们一直是按照平面图或铺盖数据模型 ,将具有鲜明的多维、动态特征的现实空间世界抽象为二维、静态目标 ,生产、提供和使用二维 (或 2 .5维 )的地理基础框架数据。该地理基础框架数据在表达或反映三维实体及其时空变化方面有着很大的局限性 ,不能满足国家信息化的应用需求。本文就数字化地理空间基础框架的狭义和广义概念、国内外地理空间框架数据的发展过程、地理空间框架数据的三维、多尺度、时态和动态问题进行了初步的分析 ,并提出了构建多维、动态地理空间框架数据的建议 ,加强对多维动态空间数据模型的理论研究 ,开展多维动态地理空间框架数据的建设工程 ,开拓多维动态地理空间框架数据的应用领域。  相似文献