基于ArcEngine小区三维排水管网验收系统设计与实现

分析了小区地下排水管网的设计、建设、验收的自动检测系统的必要性,介绍了利用ArcEngine开发GIS软件的优点,实现了小区地下排水管网的三维建模及其自动检测系统,即小区三维排水管网的验收系统;重点讨论了地下排水管网的三维建模方法,解决了以往三维场景中的三维模型只能显示、不能查询编辑的问题。     

小区域景观的三维可视化

现实世界的复杂性决定了其在计算机中表达的复杂性,三维模型的构建成为3DGIS中亟待解决的一个核心问题。探讨了三维建模思想以及建模方法,并以ArcGIS和SketchUp交互建模方法为例,论述了三维建模流程以及注意事项,通过模型库的构建,提高了该方法在小区域内景观的三维快速构建效率,所得的模型为3DGIS提供了数据源。实践表明,在有限的经济、技术等条件下,该方法具有较强的可行性和实用性。     

Conjoint modeling of residential group preferences: A comparison of the internal validity of hierarchical information integration approaches

 In this paper, two approaches for measuring residential group preferences, based on the method of Hierarchical Information Integration (HII), are compared. In particular, the hypothesis that group-based preference models estimated from integrated HII experiments better predict group preferences than part individual-based group models estimated from classical HII experiments is tested. To that effect, the models' ability to predict group preferences for new residential alternatives is compared in a study of residential preferences of co-ops. Results indicate that integrated HII group experiments indeed result in better predictions of residential preferences.     

从激光扫描数据中进行建筑物特征提取研究

提出了一套基于建筑物几何特征的信息挖掘方案,并具体介绍了研究中采用的一些原理、方法与实用算法,从而可以直接从激光扫描数据中提取建筑物的平面外轮廓信息。利用本方案对车载激光扫描系统获取的城市建筑物试验数据进行了具体的处理,并给出了三维建模和可视化表达结果。     

海岸海洋潮流模拟可视化与虚拟现实建模

潮流数值模拟的科学可视化与虚拟现实是海岸海洋科学研究重要的现代技术手段之一。首先从地理信息系统的角度对潮流数值模拟系统的数据模型进行了论述，提出了适合水文数值模拟的对象模型方法；其次探讨了空间流场的可视化技术，阐述了虚拟现实在潮流数值模拟中的作用；最后设计并实现了一个海岸海洋潮流模拟虚拟现实的原型软件系统VRO－cean,并在南黄海辐射沙洲等的潮流数值模拟试验中进行了实际对比检验。     

Development of a GIS data model with spatial,temporal and attribute components based on object-oriented approach

This paper presents a conceptual data model, the STA-model, for handling spatial, temporal and attribute aspects of objects in GIS. The model is developed on the basis of object-oriented modeling approach. This model includes two major parts: (a) modeling the signal objects by STA-object elements, and (b) modeling relationships between STA-objects. As an example, the STA-model is applied for modeling land cover change data with spatial, temporal and attribute components.     

基于ArcGIS建模的基本农田数据库建库方法探讨

通过图形化建模工具Model Builder对基本农田数据进行建库,是通过构造地理工作流和脚本将数据和空间处理工具连接起来处理的复杂的GIS任务。本文主要对基本农田数据库的建库采用Arc GIS建模的方法进行了探讨。     

CityEngine CGA支持下的苗族特色民居三维建模

少数民族民居是中华民族文化的重要组成部分,而在现今民族大融合的背景下,传统少数民族建筑的传承和发展正呈现衰退之势,采用三维建模技术对少数民族民居进行数字化保存意义重大。苗族民居造型复杂,具有独特的吊脚楼结构,给规则建模带来困难。为此,本文以CityEngine软件为建模平台,巧妙地组合与运用挤出、拆分、平移等基础函数,编写了苗族民居底层支柱、二层主屋和歇山型屋顶的规则,完整地实现了苗族典型民居的规则建模,并实现了民居样式的动态调整与民族村寨的快速生成。研究结果表明,基于CGA规则对复杂的民族民居三维建模方法可行,为数字化保存少数民族民居提供了便捷的方式。     

Monitoring canopy growth and grain yield of paddy rice in South Korea by using the GRAMI model and high spatial resolution imagery

Monitoring crop conditions and forecasting crop yields are both important for assessing crop production and for determining appropriate agricultural management practices; however, remote sensing is limited by the resolution, timing, and coverage of satellite images, and crop modeling is limited in its application at regional scales. To resolve these issues, the Gramineae (GRAMI)-rice model, which utilizes remote sensing data, was used in an effort to combine the complementary techniques of remote sensing and crop modeling. The model was then investigated for its capability to monitor canopy growth and estimate the grain yield of rice (Oryza sativa), at both the field and the regional scales, by using remote sensing images with high spatial resolution. The field scale investigation was performed using unmanned aerial vehicle (UAV) images, and the regional-scale investigation was performed using RapidEye satellite images. Simulated grain yields at the field scale were not significantly different (p = 0.45, p = 0.27, and p = 0.52) from the corresponding measured grain yields according to paired t-tests (α = 0.05). The model’s projections of grain yield at the regional scale represented the spatial grain yield variation of the corresponding field conditions to within ±1 standard deviation. Therefore, based on mapping the growth and grain yield of rice at both field and regional scales of interest within coverages of a UAV or the RapidEye satellite, our results demonstrate the applicability of the GRAMI-rice model to the monitoring and prediction of rice growth and grain yield at different spatial scales. In addition, the GRAMI-rice model is capable of reproducing seasonal variations in rice growth and grain yield at different spatial scales.     

基于GIS和VRML技术的东圳水库3维仿真建模

以福建省莆田市东圳水库为例,讨论了基于VRML的水库及其周围地理环境、流域状况仿真建模过程,以及所采用的技术和方法。通过仿真系统可以直观分析水库的环境情况,水库管理者可在场景中漫游,从不同位置进行观察分析,进而提出相应解决措施。同时该系统作为对水库进行研究的人机交互平台,可进行实时完善和扩展。