2009 17th International Conference on Geoinformatics最新文献

Employing united Delaunay triangulation in contour lines generalization 采用联合德劳内三角剖分法进行等高线泛化

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293519

Xu Zhang, Xinyan Zhu, Yingwei Yang

{"title":"Employing united Delaunay triangulation in contour lines generalization","authors":"Xu Zhang, Xinyan Zhu, Yingwei Yang","doi":"10.1109/GEOINFORMATICS.2009.5293519","DOIUrl":"https://doi.org/10.1109/GEOINFORMATICS.2009.5293519","url":null,"abstract":"Geomorphologic elements such as valley, ridge are structural information to represent natural geomorphology in spatial extension and distribution. The united Delaunay triangulation network methodology makes an improvement over traditional triangulation method, with its capability of detecting human recognizable bends. Although this united Delaunay triangulation network is more suitable for terrain structure extraction, it hasn't yet been applied in contour line generalization. This article aims at exploring its application in contour lines generalization. First, the curves of contours lines are extracted, and then at the curves local terrain structure lines are linked together. Later, a tree structure of these structure lines is built, representing their relations. In generalization, the square root model is chosen for specifying the number of valley selection. And based on the built triangulation network several important aspects to evaluate the importance of valley are taken as quantitative indexes for determining which valley needs kept and which removed. The general valley importance index calculated by this evaluation method affects the degree of generalization. In result, the generalized map generally shows no intersection and keeps the original terrain characteristic, and, thus exemplifying this united Delaunay triangulation model's great potential in contour line generalization.","PeriodicalId":121212,"journal":{"name":"2009 17th International Conference on Geoinformatics","volume":"86 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115498894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Kernel density estimation with geographically masked points 地理掩蔽点核密度估计

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5292881

Xun Shi, Jennifer A. Alford-Teaster, T. Onega

{"title":"Kernel density estimation with geographically masked points","authors":"Xun Shi, Jennifer A. Alford-Teaster, T. Onega","doi":"10.1109/GEOINFORMATICS.2009.5292881","DOIUrl":"https://doi.org/10.1109/GEOINFORMATICS.2009.5292881","url":null,"abstract":"Geographic masking displaces points to hide their identities. It has been used in health-related studies to protect patients' confidentialities. The main concern in this process is the balance between the protection of confidentiality and the preservation of the original spatial pattern. However, there is paucity in literature on quantification of this balance. We conducted a preliminary research on the most commonly used geographic masking method, the point dithering method, intending to quantify the original spatial pattern preserved under different dithering thresholds. We performed kernel density estimation (KDE) using a series of bandwidths to create density surfaces from both the original points and the dithered points, and then calculated Pearson's correlation coefficients between a density surface of the original points and its corresponding surfaces of the dithered points created with the same bandwidth. Using simulated data in New Hampshire, our test reveals a clear relationship between the bandwidth of KDE and the dithering threshold: When the bandwidth is 5 times the dithering threshold, the density surfaces of the original points and the dithered points are almost identical (in most cases the correlation coefficient ≫ 0.99). This relationship provides reference for choosing appropriate bandwidth in point pattern analysis, such as cluster detection, when working with dithered points.","PeriodicalId":121212,"journal":{"name":"2009 17th International Conference on Geoinformatics","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121128277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Very high spatial resolution images: Segmenting, modeling and knowledge discovery 非常高的空间分辨率图像:分割，建模和知识发现

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293556

Érick López-Ornelas

{"title":"Very high spatial resolution images: Segmenting, modeling and knowledge discovery","authors":"Érick López-Ornelas","doi":"10.1109/GEOINFORMATICS.2009.5293556","DOIUrl":"https://doi.org/10.1109/GEOINFORMATICS.2009.5293556","url":null,"abstract":"In this paper we describe the basic functionalities of a system dedicated to process high-resolution satellite images and to handle them through (semi-) structured descriptors. These descriptors enable to manage in a unified representation two families of features extracted from the objects identified by image segmentation: the attributes characterizing each object, and the attributes characterizing relationships between objects. Our aim is to focus on the complement of two approaches, on one hand concerns the remote sensing and the image segmentation, and on the other hand concerns the knowledge discovery and the modeling. The first approach discusses how to apply an auto-adaptive (non-linear) segmentation approach on a collection of such images. This method is based on the morphological transformations of opening and closing to obtain relevant and significant objects. Using this approach, we simplify and conserve the principal features and objects from the image. The second approach proposes to create a set of XML tags to model the main features elicited from the previous objects using their relationships. These tags are then exploited by querying, using topological, directional, or metrical relationships. Using this approach we can extract not only some explicit spatial information like urban areas, wooded areas and linear features such as roads or railways, but some implicit spatial information like urban organization or urban dynamics.","PeriodicalId":121212,"journal":{"name":"2009 17th International Conference on Geoinformatics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127151192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Classification of remotely sensed imagery using adjacent features based approach 基于相邻特征的遥感影像分类方法

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293187

M. Bai, Huiping Liu, Wenli Huang, Yu Qiao, Xiaodong Mu

引用次数: 1

The node management in a geospatial data grid 地理空间数据网格中的节点管理

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293480

Pengfei Wu, Yu Fang, Bin Chen, Yong Zhao, Menglong Yan, Yixian Sun

引用次数: 0

Semantic relation representation of geographic concept based on lattice 基于格的地理概念语义关系表示

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293511

Hong Wang, Lin Li, Ping-Chao Song

引用次数: 0

Study on risk assessment model of urban drought in Hilly Area of Central Sichuan Basin 川中丘陵区城市干旱风险评价模型研究

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293488

L. Jiang, Youlong Zhai, Bin Zhang, Chengqiang Shu, Lili Wang

{"title":"Study on risk assessment model of urban drought in Hilly Area of Central Sichuan Basin","authors":"L. Jiang, Youlong Zhai, Bin Zhang, Chengqiang Shu, Lili Wang","doi":"10.1109/GEOINFORMATICS.2009.5293488","DOIUrl":"https://doi.org/10.1109/GEOINFORMATICS.2009.5293488","url":null,"abstract":"This drought, especially for city seriously affects the social and economic development of city. Drought is characterized by their high frequency, broad range and great loss. Nanchong city is one of the major cities with drought in Hilly Area of Central Sichuan Basin. This study presents a model of risk assessment of urban drought which integrates hazard, exposure, vulnerability and emergency response and recovery capability in Nanchong city, by using the technology of natural disaster risk assessment, weighted comprehensive analysis and analytic hierarchy process and. On the basis of research on the intension and the cause of the drought risk, this study sets up the mathematical model for the drought risk assessment and then use this model to calculate the intensity of drought risk of Nanchong city in Hilly Area of Central Sichuan Basin from different perspective. The risk map of urban drought is drawn based on GIS. This study can be expected to provide solid theories and technological supports for taking comprehensive and active measurements to fight drought in Nanchong city.","PeriodicalId":121212,"journal":{"name":"2009 17th International Conference on Geoinformatics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116561495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Web Service for extracting Terrain Openness from DEM Data 从DEM数据中提取地形开放性的Web服务

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293470

W. Luo, Xiaoyan Li, L. Di, T. Stepinski

{"title":"Web Service for extracting Terrain Openness from DEM Data","authors":"W. Luo, Xiaoyan Li, L. Di, T. Stepinski","doi":"10.1109/GEOINFORMATICS.2009.5293470","DOIUrl":"https://doi.org/10.1109/GEOINFORMATICS.2009.5293470","url":null,"abstract":"This paper discusses the implementation of the Terrain Openness parameter as a Web Service. Terrain Openness is a new morphology parameter that emphasizes surface concavities and convexities (Yokoyama et al., 2002) and can be derived directly from a digital elevation model (DEM). It is essentially an angular measure of the relation between surface relief and horizontal distance and can be used as a proxy for topographic curvature. It is not sensitive to noise in the data and has spatial scale built in its definition. However, the Terrain Openness parameter has not been widely used, perhaps because of limited software availability. Implementing it as a Web Service will ensure widest possible accessibility, because the only requirement for the user is an Internet connection and a standard web browser. This is made possible with recent advances in Service-Oriented Architecture (SOA), geospatial Web Services, and interoperability technologies. It is implemented within the framework of GeoBrain, an open, interoperable, distributed, standard-compliant, multi-tier web-based geospatial information services and knowledge building system.","PeriodicalId":121212,"journal":{"name":"2009 17th International Conference on Geoinformatics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128438920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Organization and schedule of multi-resolution pyramid based on wavelet transform 基于小波变换的多分辨率金字塔的组织与调度

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293536

Longgang Xiang, Xinyan Zhu

引用次数: 1

Application of GPS/GIS technologies in the pre-hospital first aid: Lessons learned from Suzhou municipal hospital case study GPS/GIS技术在院前急救中的应用——以苏州市医院为例

2009 17th International Conference on Geoinformatics Pub Date : 2009-10-23 DOI: 10.1109/GEOINFORMATICS.2009.5293042

Y. Bai

引用次数: 1