采用逻辑回归的汾河流域遗址分布研究

为了更好地指导考古挖掘和理解古人类活动,该文从汾河流域DEM数据中提取高程、坡度、坡向、地形起伏度、地表曲率、距河流距离及距大遗址距离等作为自变量,利用二元逻辑回归建立流域内仰韶时期至夏商时期各时期遗址分布模型,对模型结果进行了定量分析并生成了汾河流域各时期遗址分布概率图,在此基础上对汾河流域人类文化遗址的分布特征进行研究。遗址分布模型总体分类精度较好。遗址分布模型对考古工作及古环境研究具有重要价值,可以为考古工作提供决策支持。     

对等导航服务网格平台的设计与实现

针对网格环境下导航地图数据的共享与管理问题,文章提出以多级分区空间索引目录结构为基础的对等导航服务网格体系结构:分析了对等导航服务网格平台实现的关键技术,并基于Globus Toolkit设计实现了对等导航应用服务网格实验平台,提供了全国范围的地图浏览、定位监控、路径分析等服务。实验结果表明该平台能为位置服务应用提供高效的服务。     

北京市河流信息识别与提取

针对传统的河流信息识别和提取方法不适用于平原地区城市这一情况,该文基于北京市河流的自然和人文特征,提取城市水系网络,划分流域边界,并对河流的特征信息进行提取;从城市河流的特征识别、信息提取、空间插值等几个方面进行了总结和归纳,并从实际应用的角度进行了案例分析。研究的思路和方法可以为其他城市的相关工作提供参考。     

一种基于边界搜索的栅格矢量化算法

栅格数据的矢量化是GIS领域重要的研究内容。针对栅格数据矢量化准确率低和效率低等问题,该文提出了一种基于边界搜索的矢量化算法,通过对栅格图像的一次遍历,提取结点和中间点,生成弧段,构建多边形;并在构建多边形中,提出了一种简单易行的最右侧方向判断方法,综合运用最小外接矩形和射线法判定逆时针多边形的归属。实验表明,该文提出的矢量化算法能够较准确矢量化复杂的栅格图像,具有较好的效率,可为多值栅格图像快速矢量化及相关研究提供借鉴。     

Land quality index assessment for agricultural purpose using multi-criteria decision analysis (MCDA)

In this study, an attempt has been made to apply Remote Sensing (RS) and geographic information system (GIS) to determine land quality for agriculture purpose using analytic hierarchy process technique. In this study, various thematic layers were used like organic matter content, soil texture, soil depth, soil pH, soil P, soil K, geomorphology, run-off potential, slope and land use/land cover to assess the land quality index of the study area for the agriculture purpose which were generated in the RS and GIS environment. The study area can be divided into four zones, viz. high quality, moderately quality, marginally quality and low quality according to their suitability of land quality for agriculture purpose. It was found that about 39.09, 31.24, 20.41 and 9.26% of the study area falls under high quality zone, moderately quality, marginally quality and low quality zone, respectively, for agricultural purpose.     

Applying landscape-ecological concept and GIS modelling for assessing and mapping of ecological situation of mountainous landscapes (on the case of Syunik marz,Armenia)

Regional landscape-ecological studies have acquired a special topicality as they assure efficient environmental conservation and sustainable use of natural resources. A landscape-ecological analysis was performed based on four basic integral indices: (1) ecological potential, (2) ecological stability, (3) ecological load and (4) ecological tension. The values of basic integral indices of the landscape-ecological analysis were calculated as sums of respective factors expressed in scores and multiplied by their significance reflecting coefficients. In agreement with that rule, a formula was derived of calculation of basic indices of landscape-ecological analysis. Subsequently, those factors were integrated by ‘Model Builder’ in ArcGIS applying ‘Weighted Sum’ functions. Finally, through geographic information systems modelling, maps of basic indices of landscape-ecological analysis were produced. In conclusion – ecological potential, stability, load and tension are best indicators for the assessment of the landscape-ecological situation of the studied territory.     

农产品物流监控系统设计与开发研究

对农产品物流的监控可以及时发现农产品在流通环节的问题。结合无线传感网(WSN)技术、GIS技术、GPS技术、RFID技术,集成成熟的无线通信和数据库技术,构建可视化、智能化、通用的农产品物流监控系统,为物流链管理者提供便捷、全面的监控体系。本文介绍了系统的设计与实现。     

PPGIS在国土空间规划中的应用研究

通过分析国内外国土空间规划发展历程,指出公众参与规划面临积极性不够、专业性不强、参与形式单一等问题.PPGIS是公众参与理论与GIS及其相关技术相结合产生的一个新的应用研究方向.本文通过研究PPGIS在国土空间规划确定规划目标、方案优选、规划审批、规划实施四个阶段的应用,解决了公众参与规划存在的一系列问题,并且提高了规划的科学性、合理性和可操作性.     

基于开源的轻量级WebGIS开发框架的研究与实现

介绍了当前WebGIS的发展趋势和WebGIS开发技术和框架,分析了优势和不足.通过选择合适的开源技术库构建了一个轻量级的WebGIS开发框架,并详细介绍了该框架的组成.利用该技术框架开发了我国水产生物资源分布查询系统.结果表明,使用该框架开发能够快速构建跨平台的GIS应用.     

基于SuperMap的三维土地利用现状信息系统开发研究

针对土地调查数据的应用需求,本文提出了利用SuperMap,Javascfipt,HTML等技术集成开发“三维土地利用现状信息系统”的方法.对系统技术架构、功能、数据组织进行了设计,并完成系统的构建,实现土地调查数据的三维应用,扩大了土地调查数据成果的应用范围,提高了国土部门的信息化服务水平.