基于3D影像模型的长白山天池地质灾害现状与潜在危害分析

通过遥感解译及野外调查工作,查清了长白山天池地区主要地质灾害分布现状及规模,分析了灾害发生的机理,编制了地质灾害危害区划图,能够为相关防灾减灾部门提供决策依据.     

基于RS与GIS的水库蓄水期起始时间的判定

对以冰川积雪融水补给为主的河流而言,水库蓄水期起始时间的判定对水库的正常运行起较重要的作用.在水库实际运行中何时开始水库蓄水并没有一个合理的确定标准,水库运行管理人员只能根据流域特性主观确定,受人为因素影响较大.借助RS和GIS以及数字高程数据(DEM)分析了研究区2005年各个时期各个高程带的积雪覆盖率变化.通过比较分析确定了研究区较合理的水库蓄水期起始时间,为今后水库运行管理提供了一个参考依据.     

PDA＋3S技术在土地变更调查中的应用研究

以陕西省宝鸡市土地变更调查为例,通过介绍PDA（掌上电脑）与GIS、GPS、RS等技术的结合在土地变更调查中的应用,探讨PDA与3S的结合在土地变更调查中的应用前景以及发展趋势。     

5·12地震灾区生态环境变化研究

针对5·12地震及快速灾后重建带来的生态环境变化,基于不同时相的遥感影像数据,构建研究区(北川县)生态环境综合评价体系结构,并提取相关变化信息,最终得出生态环境质量等级图。结果表明:地震及其次生灾害和灾后重建等使得北川县特别是东南部老县城附近地区、新县城重建地区生态环境受到一定程度的破坏,造成该地区环境质量的下降。     

Study on gis data directly integrated into image processing

The basic properties to be dealt with, when considering initially the research needs related to the integration of remote sensing (RS) information into a geographic information system (GIS), are many-sided. The primary combination of remote sensing and GIS is mainly realized by the transforms of data structure. Because of its own limitations, there is an urgent need to investigate the integration of RS and GIS in higher levels. In this paper, we discuss the different types of combinations of RS with GIS, and propose that GIS data should be directly brought into image processing from the beginning. A tentative idea of how to use the method of granularity to study the common processing unit of RS and GIS is described. The example for the determination of granularity of spatial data processing related to run-length-code line is also given.     

The hypermedia data model based on the infinity image

This paper presents the hypermedia data model based on the infinity RS image information system we have developed. The hypermedia data model consists of different semantic units called nodes, and the associations between nodes are called links. This paper proposes three kinds of nodes (interior node, physical node and complex node) and two kinds of links (plane network structure link, hyper-cube network structure links). The hypermedia information system, based on the model and the basic data layer (the infiniy RS image), represents a digital globe. An approach to the “Getting Lost in the Hyper-space” problem is presented. The approach using the hypermedia data model is an efficient way of handling a large number of RS images in various geographical information systems.     

Catchment storm runoff modelling using the geomorphologic instantaneous unit hydrograph

A lumped empirical model, the Geomorphologic Instantaneous Unit Hydrograph (GIUH) rainfall-runoff model, is developed for the Can Le catchment in the upstream region of the Sai Gon river Basin (Vietnam). This model can serve to simulate catchment runoff into the Dau Tieng Reservoir and can be used as a flood forecasting tool for the ungauged Can Le catchment. The GIUH couples geomorphology and hydrology quantitatively. The obtained Unit Hydrograph is based on Horton's morphometric parameters; bifurcation, length and area ratios. A new functionality within the ILWIS GIS-RS package, namely ‘DEM-hydro processing’, is applied to effectively process a Digital Elevation Model to extract these ratios from the drainage network. To supplement the limited field data available, various satellites images have been used such as ASTER, SRTM (Shuttle Radar Topography Mission) and METEOSAT 5. A short field campaign to collect missing ground data was executed between September and October 2005. The data collected included discharge (and stage – discharge curve), meteorological data, soil, land use information that are used for paramerisation, calibration and validation of the GIUH. The model was successfully applied for the Can Le catchment. Using the Horton's morphometric parameters derived from the DEM with estimated overland and stream flow velocities, the model is easy-to-use.     

双桥-新路地区遥感影像的增强处理与构造解译

通过综合利用主成分分析替换法和高分辨率主成分分析融合法,对双桥-新路地区的遥感影像进行了增强处理与构造解译、甄别,突出了不同规模构造体系的特点,实现了对区内不同规模构造信息的有效补充。经后期野外验证,解译成果具有较高可信度,有助于该区热液型铀矿找矿靶区的圈定定位及后续资源潜力评价工作的开展。     

苏、锡、常建成区遥感方法提取及城市扩展分析

将苏州、无锡、常州三市作为研究区域,详细介绍了借助遥感技术快速获取城市建成区的新方法和技术路线.将TM3、TM2两个波段移植于归一化建筑指数(NDBI)法,并同NDBI相结合提取城市建设用地,再通过制定的适于遥感划分建成区的界定方法.筛选出符合要求的建设用地得到三座城市的建成区范围.利用简单的统计方法和叠加分析方法,对...     

基于RS、GIS的杜蒙县土地利用结构变化研究

依据杜蒙县1990和2007年TM影像、土地利用变更统计数据,在土地利用结构数量、动态度指数及土地利用结构信息墒上,分析了该地区土地利用结构的变化.结果显示:杜蒙县土地利用类型分布较均匀,各类用地结构结构有一定差异.最后根据结果分析了杜蒙县土地利用结构变化的原因,并提出了土地利用的建议.