2013 21st International Conference on Geoinformatics最新文献

{"title":"Remote sensing monitoring of Gulf of Mexico oil spill using ENVISAT ASAR images","authors":"Jianhua Wan, Yangrui Cheng","doi":"10.1109/Geoinformatics.2013.6626165","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626165","url":null,"abstract":"Marine oil spill causes ecological pollutions that result in serious impacts to the quality of marine eco-environment. Effective oil spill detection and monitoring are the basis for the rapid response and play an important role. Due to its all-weather, day and night detection, wide coverage, and real-time monitoring capability, Synthetic Aperture Radar (SAR) is the most applicable sensors for marine oil spill monitoring and detection. Radar detection of target always uses back scattering of its reaction. After the oil spills, oil slicks spread to the sea surface dampen the Bragg waves and reduce radar backscattering coefficients; that is, smooth the sea surface. So oil spills appear as dark areas in the SAR images. The critical part of the oil spill detection is to distinguish oil spills from other natural phenomena. Low wind speed areas, internal waves, biogenic films and so on can lead to this phenomenon, which are called \"look-alikes\". Based on the principle of oil spill detection using SAR images, analysis accomplished over ENVISAT ASAR data gathered in the Gulf of Mexico and related to the Deepwater Horizon oil spill accident, which happened on April 20, 2010, is mentioned in this paper. The main areas of interest related to such disaster are the following: (1) to detect oil spills at sea and (2) analyze changes of oil slicks over the sea. In order to achieve the proposed goal, the method consists of three steps: preprocessing, detection of dark spots and analysis. Firstly, the SAR data are pre-processed, including histogram equalization, geometric correction and speckle filtering. Enhanced Lee filter is used to reduce the speckle noise due to the good capability in noise suppression and edge preserving. Secondly, SAR image classification and oil spill identification are carried out. Because of dark patches in SAR images cause by other natural phenomena, the purpose of the classifier is to distinguish oil spills from look-alikes. So the object-based classification is applied with support vector machine (SVM) owing to a better effect for oil spill identification. Last but not the least, based on the results of oil spill exaction and polluted areas, the development process of Deepwater Horizon oil spill is analyzed, such as the temporal dispersion scope, diffusion and drift of the oil slick. In addition, oil spill area is calculated for area variation tendency. At the early stage of this accident, shapes of oil slicks mainly appear as patches. As time passed by, quite a few parts of oil slicks showed as stripes. Oil slick shape and position were affected by winds, ocean currents and so on. During the middle or later period, a portion of oil slick eroded the coasts of Louisiana, Alabama and Florida. In the early days of the Deepwater Horizon oil spill, the size of oil slicks presented the tendency of increasing as a whole and reached a peak in June. However, after July, areas of oil slicks began to fall. Relevant reports such as weather and plu","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"8 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131614868","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}

{"title":"Design and implementation of tourism information system based on Google Maps API","authors":"Yimeng Wu, Zhixue Liang, Liming Liu","doi":"10.1109/Geoinformatics.2013.6626139","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626139","url":null,"abstract":"Obtaining more accurate information of tourism destinations is the most concerning thing for tourists, especially for self-navigation tourists. This paper proposed a resolution which constructs tourism information system using Google Maps with Web GIS. Based on J2EE platform, adopting technologies of struts2 framework, Google Maps API, Ajax, JSON and so on, an open travel information platform was implemented. Using the platform, tourists can conveniently obtain more references for their travel.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116520202","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}

{"title":"On the impact of granularity of time to linear topological relations between geographical events and their formalization","authors":"Kai Liu, Y. Long, Huimin Yang, Yaochen Qin","doi":"10.1109/Geoinformatics.2013.6626056","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626056","url":null,"abstract":"The time scale is an important element of spatial-temporal data model thatdetermines the level of detail to characterize and describe the geographic information. In spatial-temporal databases, time granularity has a decisive impact on the topological spatial-temporal relationship of geographical objects. In this paper, at first a formal definition of basic elements of time has been put forward. Then based on set theory, the number axes can be divided into three parts according to the number of time of geographical event. Based on the intersection of the sets of two-time elements a formal description of the 9 intersection model of the linear time topological relationships between geographical events has been established. On this basis, the impacts of time granularity to topological relationships of linear time between geographic events also has been discussed with a case study.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128078234","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}

{"title":"A framework and implementation for qualitative geographic information retrieval","authors":"Lei Liu, Yong Gao, Xing Lin, Xiao Guo, Haoran Li","doi":"10.1109/Geoinformatics.2013.6626034","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626034","url":null,"abstract":"Qualitative geographic information retrieval (QGIR) is proposed in this paper. It is semantic matching oriented and based on the qualitative representation. Qualitative reasoning is used to get the relevance between documents and queries. Compared to the traditional geographic information retrieval (GIR), QGIR uses qualitative representation for both themes and place names. Semantic spatial relationships are taken into account. The qualitative representation is closer to human spatial recognition and can handle natural language better. A system is built to verify the qualitative theory and to compare the qualitative method with traditional GIR. The experiment in the mineral filed shows that QGIR can have better searching results and better fulfill people's geographic information retrieval request.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133306180","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}

{"title":"Chongqing urban ecological flood control study of river basin","authors":"J. Dai, G. Zeng, Lingyun Li","doi":"10.1109/Geoinformatics.2013.6626064","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626064","url":null,"abstract":"In the process of city expansion, irrational development brings about serious phenomenon, such as filling lakes to make land and occupation of the riverway, which results in shrinkage of urban rivers and lakes, decline of flood discharge capacity, weakening of water holding capacity of lakes, and reduction of areas of wetland and greenbelt. The flood control and retention capacity of the original ecosystem reduces, thus the frequency of flood disaster and extent of damage are aggravated. This article explains the close relationship between urbanization and urban flood disaster by discussing the formative factors of climate changes and urban flood disaster, and studying the formation mechanism of urban flood disaster. On the basis of studying the overall arrangement and flood control function of rivers, lakes, wetlands, and greenbelts, this article provides an idea of urban ecological flood control and analyzes the ecological flood control pattern of main urban areas of Chongqing by comprehensive utilization of GIS. The results show that the major transformation direction of main urban areas of Chongqing is transforming from cultivated land to urban construction land. Along with the completion and impoundment of the Three Gorges Project, water level of the upstream of the Yangtze River is rising continuously and there is a trend of increasing year by year in the water area of Chongqing section.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115052514","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}

{"title":"The spatial distribution of global urban heat island intensity and the influence of urban sprawl","authors":"Yaoping Cui, Yaochen Qin","doi":"10.1109/Geoinformatics.2013.6626085","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626085","url":null,"abstract":"With significant urbanization effects, the urban heat island effect has been reported in many cities. There are many related researches on urban heat island effect in a single city or urban agglomeration. In this paper, MODIS land surface temperature products, maps of global urban extent, gross domestic product, and population data were used to analyze the relationship between urban heat island intensity and urban sprawl factors. The results showed that: (1) the distribution of global urban heat island intensity existed obviously spatial heterogeneity, and the dominant impact factor of urban sprawl on urban heat island intensity in different regions was different. (2) Urban heat island intensity mainly were related to the human activities (gross domestic product and population), while the impact of urban shape characteristics (urban area and urban shape index) were limited. Therefore, to a certain extent it may be possible to keep the urban heat island intensity down under well-organized urban sprawling. (3) Urban heat island intensity could not be fully explained by urban sprawl factors only, other factors such as climatic factors still played an important role.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116077688","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}

{"title":"Integration of association-rule and decision tree for high resolution image classification","authors":"Ziyong Zhou, Yang Zhang","doi":"10.1109/Geoinformatics.2013.6626123","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626123","url":null,"abstract":"Association rule is one of the most important rules in nature. Each type of object in a remotely sensed image relates to special association rules, thus association rules are important features for image classification, and the mining and rational selection of the effective rules is the key issues for accurate classification. In this paper, an approach that integrates association rules analysis and decision tree is presented and applied to object-oriented high resolution image classification. The association rules analysis is adopted for mining strong rules from an image, and the decision tree is for finding the optimal rules for classification. A Geoeye-1 image is used for experimental data. Firstly, the Geoeye-1 image is segmented, then spatial, spectral, textural, color space and band ration features are selected. The association rules in a training set are mined, and a decision tree is designed with consideration of confidence, support of mined rules, as well spectral complexity and the generation sequence of rules. The visual comparison with the results of K-nearest neighbors and accuracy estimation validate the effect of the proposed approach.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115392377","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}

{"title":"An improved algorithm for vector data rendering in virtual terrain visualization","authors":"Ye Zhi, Yong Gao, Lun Wu, Liang Liu, Heng Cai","doi":"10.1109/Geoinformatics.2013.6626137","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626137","url":null,"abstract":"In recent years, the importance of virtual terrain visualization technology for the digital earth models has been more obvious. Since two-dimensional (2D)vector data still occupy the vast majority of the GIS (Geographic Information System) vector data, the algorithm for vector data rendering in virtual terrain visualization plays a crucial role in the digital earth models. After deeply analyzing the current algorithms, the paper proposes an improved vector data rendering algorithm based on texture. As for the problem of aliasing artifacts, according to the context of rendering scene (e.g. the viewpoint's position), the improved algorithmutilizes the method of the dramatic texture overlay, combining the visualization of the terrain with the vector data selected by the view scene using the method of Render-to-Texture based on DirectX in real-time. And meanwhile the method constructs the mapping table between the vector data and texture to simplify the operation for the highlight selecting and the vector data's querying. After applied in the practical vector data, the improved algorithm is proved that it not only keeps the same advantage as the texture-based method such as fast rendering and easy to control the layer, but also is notconfined by the resolution of the texture without the phenomenon of aliasing artifacts and raises the efficiency in highlight selecting and the vector data attributes' querying.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124458445","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}

{"title":"Analyzing urban population's space-time evolution and characteristics based on cell-phone location data — A case study in Shenzhen, China","authors":"Xianrui Xu, X. Li, Zhongren Peng","doi":"10.1109/Geoinformatics.2013.6626032","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626032","url":null,"abstract":"This paper analyzes characteristics of population distribution and movements of the city of Shenzhen in southern China by using mobile phone position data, and visualizes the distribution and movements of population in Shenzhen. Nowadays, positioning information of calling activity records of cell phones is more and more feasible with popularity of cell phones and development of the cell network. The tremendous advantages of positioning data in massive data samples, real-time and coverage guarantee it can be a significant supplement tool to monitor population dynamics. The experimental results display a vivid visual representation of population distribution and their movements through space and time. This paper's analytical method and results can potentially contribute to a better understanding of the surrounding city and further benefits to urban planning and management.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124858345","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}

{"title":"Spatial differentiation of urban carbon emissions — An exploratory spatial data analysis in Beijing","authors":"Lijun Zhang, Yaochen Qin, Jinping Zhang, Chaojun Lu","doi":"10.1109/Geoinformatics.2013.6626146","DOIUrl":"https://doi.org/10.1109/Geoinformatics.2013.6626146","url":null,"abstract":"While the fossil energy-related carbon emissions have been documented in cities, much less attention has been devoted to exploring the spatial pattern and structure of carbon emissions in urban area. On the basis of carbon emissions estimation of sub-districts in Beijng, this article performs an exploratory spatial data analysis (ESDA) to investigate the spatial differentiation of urban carbon emissions over 2000~2010. The results confirm the assumption about the spatial autocorrelation of carbon emissions based on spatial agglomeration of population and spatial restructuring of economy. The carbon emissions in sub-districts reflect a core-periphery structure in Beijing and reveal a significant presence of spatial autocorrelation with distinct spatial clusters of high and low values of carbon emissions. However, the carbon emission centers are dissimilar with population centers due to differentiation from geographical division of labor. Overall, our results shed new light on the analysis of urban spatial structure of resource utilization and environmental impact.","PeriodicalId":286908,"journal":{"name":"2013 21st International Conference on Geoinformatics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123861525","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}