Preliminary Rock-Slope-Susceptibility Assessment Using GIS and the SMR Classification   总被引：1，自引：1，他引：1  

Irigaray  C.  Fernández  T.  Chacón  J. 《Natural Hazards》2003,30(3):309-324

This paper aims to examine the impact of large-scale structuraladjustments (like the Greater Dhaka Flood Protection Project, GDFPP) on local living environment.It focuses the importance of environmental factors in flood hazard mitigation, and examines theenvironmental attitudes of the floodplain residents arising from the large-scale structural adjustments.Based on `perceived natural hazard research perspectives', this paper examines: (i) the reasons for persistentfloodplain occupation, and (ii) the importance of environmental factors in the choice, motivations and decision-makingof floodplain residents.This research used data collected from 300 households situated inthe eastern part of Dhaka. The face-to-face household survey data provided individuals' responses to a structuredquestionnaire on hazards and environment. Survey concerned urban floodplains, and looked fordata on housing, household characteristics, and residents' attitudes. Results of interview surveys wereused to: (i) explore the reasons of floodplain occupation, and (ii) residents' attitudes to tolerable levelof flood risk and willingness to accept environmental change resulting from the proposed structural embankments inthe eastern perimeter of Dhaka City, Bangladesh.Findings revealed that floodplain occupation (by theindividuals' decision-making) was a result of overall reaction to the Government's structuraladjustment policies that resulted from institutional, locational and socio-economic factors. The attitude survey results provided residents' perception to hazards and environment to be dependenton the socio-economic factors – but in a complex manner, many factors are interrelated.In addition to support for structural embankments, the study sample displayed a common concernand widespread environmental awareness. In terms of any `trade-off' between thebenefits (resources) from the embankments and costs (hazards) due to the detrimental impact on environment, the residents of Dhaka, despite some concern forsacrificing embankments for environment, tended to show a generalconsensus for embankments.  相似文献   

A comparison of three image-object methods for the multiscale analysis of landscape structure   总被引：4，自引：0，他引：4  

Geoffrey J. Hay  Thomas Blaschke  Danielle J. Marceau  Andr Bouchard 《ISPRS Journal of Photogrammetry and Remote Sensing》2003,57(5-6):327

Within the conceptual framework of Complex Systems, we discuss the importance and challenges in extracting and linking multiscale objects from high-resolution remote sensing imagery to improve the monitoring, modeling and management of complex landscapes. In particular, we emphasize that remote sensing data are a particular case of the modifiable areal unit problem (MAUP) and describe how image-objects provide a way to reduce this problem. We then hypothesize that multiscale analysis should be guided by the intrinsic scale of the dominant landscape objects composing a scene and describe three different multiscale image-processing techniques with the potential to achieve this. Each of these techniques, i.e., Fractal Net Evolution Approach (FNEA), Linear Scale-Space and Blob-Feature Detection (SS), and Multiscale Object-Specific Analysis (MOSA), facilitates the multiscale pattern analysis, exploration and hierarchical linking of image-objects based on methods that derive spatially explicit multiscale contextual information from a single resolution of remote sensing imagery. We then outline the weaknesses and strengths of each technique and provide strategies for their improvement.  相似文献   

精化区域大地水准面若干问题的探讨   总被引：1，自引：0，他引：1  

张全德  张燕平  张鹏  陈现军 《武汉大学学报(信息科学版)》2003,(Z1)

对精化区域大地水准面的一些问题进行了探讨 ,以便有关单位在精化区域大地水准面时进行参考。  相似文献   

数字水印技术与算法实现   总被引：6，自引：0，他引：6  

袁静 刘宏张建军  耿则勋 《测绘学院学报》2003,20(3):201-205

综述了数字水印技术的起源、概念、特点和应用；提出了数字水印处理技术的基本框架；列出了一些主要的基于图像的水印嵌入算法和水印检测算法；并展望了水印处理技术的未来发展趋势；最后给出了一种基于DCT变换的水印嵌入与检测算法。  相似文献   

彬县川道塑料中棚早春茬黄瓜、秋延茬番茄气候生态适应性分析          下载免费PDF全文

张文忠  张保东  刘彬  高联门  雷小云 《山西气象》2003,(1):31-33

寿阳县农网正式开通运行以来，取得了良好的经济效益和社会效益，通过对全县各乡镇农网运行情况的调查，找出存在的问题，提出今后发展目标和对策。  相似文献   

多时相Radarsat数据在广东肇庆地区稻田分类中的应用   总被引：11，自引：2，他引：11  

刘浩  邵芸  王翠珍  Brian Brisco  Gordon Staples 《国土资源遥感》1997,8(4):1-6,13

将1996年获取的4个时相的Radarsat图像用于广东肇庆地区的稻田分类试验,结果表明,多时相Radarsat数据对水稻类型的识别精度较高,而且稻田的轮作规律容易推测出来。本文系统地介绍了这一试验研究的最新进展,探讨了神经网络分类方法在SAR图像处理中的应用潜力和Radarsat数据在中国南方水稻监测中的最佳时相选择和有效分辨率问题。  相似文献   

黑河实验区地表净辐射区域分布及季节变化   总被引：22，自引：3，他引：22       下载免费PDF全文

马耀明  王介民  Massimo Menenti  Wim Bastiaanssen 《大气科学》1997,21(6):743-749

利用卫星遥感信息和地面观测资料，分析研究黑河实验区地表净辐射的区域分布及季节变化特征。结果表明，卫星遥感结合地面观测，首先可以得到较为精确的地表反射率和地表温度分布，进而得到较为合理的地表净辐射的区域分布和季节变化特征。  相似文献   

香港的土地利用与环境保护   总被引：1，自引：0，他引：1  

陈朝辉 《热带地理》1997,17(2):149-156

香港地区地域狭小，地形崎岖，可利用地少，人口众多，用地紧张，但严谨的用地政策、规划用地和严格管地，使城镇有序，城乡结合协调，基础设施完善，做到合理用地，有效用地和高效用地，从而成为一座名副其实、整洁、美丽的现代化国际大都市。  相似文献   

遥感技术在化工环境保护中的应用     

邢耶  杨泽元 《化工矿产地质》1997,19(3):189-192

遥感技术获取的可见光、红外及微波信息，可以对化工企业及化学矿山环境污染（水、粉尘、大气、废渣污染等）及环境地质灾害（滑坡、泥石流、地面塌陷等）进行实时动态监测，并可获得较高的社会经济效益，达到地面环保及常规环境地质工作难以达到的效果。特别是对重点大中型化工企业及化学矿山建立环境遥感信息动态监测系统，可以为国家决策部门及时准确地提供环境治理和改造的依据。  相似文献   

一种简单方便的防拷贝程序设计方法——识别计算机的C语言程序设计     

王华军  罗延钟 《物探化探计算技术》1997,(2)

本文主要讨论一种特殊的Ｃ语言程序设计方法，这种程序能有效地对自身的关键模块加密，并能在运行时完成动态解密。该方法主要利用了“硬盘分区表”和最初安装在硬盘中程序自身的位置等信息，采用伪随机数加密法来实现。因所设计的程序具有识别计算机的能力，能有效地防止非法复制，从而保护软件制作者的知识产权和经济利益  相似文献