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Geoinformatics, 2010 18th International Conference on

Date 18-20 June 2010

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Displaying Results 1 - 25 of 553
  • [Title page]

    Publication Year: 2010 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2010 , Page(s): 1
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  • Message from the conference co-chairs

    Publication Year: 2010 , Page(s): 1 - 2
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  • A study of PS-InSAR method for small area urban land subsidence

    Publication Year: 2010 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1035 KB) |  | HTML iconHTML  

    Persistent Scatterers for SAR Interferometry (PS-InSAR) tecnique allows monitoring the temporal evolution of a deformation phenomenon at millimeter level, via the generation of mean deformation velocity maps and displacement time series from a data set of acquired SAR images. However, the serious noises of multi-temporal SAR images make the selection of permanent scatters (PSs) difficult. In this paper, we propose a novel PS-InSAR method based on wavelet phase analysis to solve this problem by improving the quality of interferograms. Firstly, both the real parts and the imaginary parts of SAR interferograms are processed by wavelet decomposition. Secondly, the interferograms on every level are filtered by grads dependent adaptive filter and reconstructed. Finally, interferograms are processed to identify PSs by using two indices namely, amplitude disperse index and spatial correlation index, followed by an unwrap process to extract land subsidence information. We then use this method to process 12 ENVISAT SAR imags covering Jiaxing city in Zhejiang province, China. The experimental results show its effectiveness in residuals and PSs identification and land subsidence extraction for plain urban area. View full abstract»

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  • Web mapping service on second life compatible virtual world system

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (573 KB) |  | HTML iconHTML  

    Online virtual world such as second life becomes more and more popular nowadays. And way-finding in large-scale virtual worlds becomes important problem for both novices and experts. Similar to the physical world, a well-designed mapping system would play an important role in way-finding process. However, Second Life only supports thumbnail map system right now. The thumbnail map system could only provide an overview of the area and with no query support. There are several challenges to develop a better virtual mapping system. First, identify the virtual world geo-features and to develop proper criteria and algorithms to generate features from primitive which is the basic unit in virtual world. Second, provide web service for data access through the Internet from systems with different architectures. In this paper, we implemented a prototype map service system called VWMS conformed to OWS specification from OpenGIS consortium. The prototype includes an AJAX style map site and a feature generalization server-module extracting geo-feature from Open Simulator primitive database. Besides, the system also provides a Web Map Service interface for interoperability. View full abstract»

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  • GDAL-based extend ArcGIS Engine's support for HDF file format

    Publication Year: 2010 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (479 KB) |  | HTML iconHTML  

    ArcGIS Engine can access HDF files with only one dataset, but can not access HDF files with multiple datasets. To Make ArcGIS Engine have the ability to access HDF files with multiple datasets, this article studies the data model of GDAL, and uses the API of GDAL to read HDF files into memory, then uses the programming interface of ArcGIS Engine to convert the data in memory to raster datasets that ArcGIS Engine can access. With this method, ArcGIS Engine will have the ability to access HDF files with multiple datasets. View full abstract»

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  • Simulation of land use/ cover change based on the CLUE-S model

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    Qingxin County is a typical transition area between the Pearl River Delta and north Guangdong. To explore the ideal land use pattern of Qingxin County, this article simulates the county's land use/cover changes based on the CLUE-S (the Conversion and Land Use and its Effects) model. The relation between land use changes and its driving factors are studied by analyzing static and dynamic factors in the simulation process. Besides, the spatial distribution of land use of Qingxin County in 2020 is predicted with the statistical and scenario analysis methods, and the results under different scenarios are plotted into simulated land cover maps. Compared with the land use of 2007, the environmental, economic and social consequences resulting from the simulated land use/cover changes in 2020 indicate that the simulation under the full-sided development goals, is more in line with Qingxin County's actual conditions, and also has greatly practical significance in land use. View full abstract»

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  • Dynamic land use change in rapidly urbanizing region

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (445 KB) |  | HTML iconHTML  

    Land use change (LUC) model is fundamental in decision making process for regional sustainable development. It is practically important to analyze LUC in rapidly urbanizing region, such as Panyu District of Guangzhou, China, where a fast economy development makes it necessary to study the rule of urban land use change. Taking time-spatial land use change as the key point, a case study is carried out to analyze the land use change process, based on the land use data of 1996, 2005, and 2009. The transformation matrix of land use is calculated to show the spatial pattern and reveal the spatial change process of land use between 1996 and 2009. A multi-logistic regression model which takes five dependent factors is adopted to analyze the land use change process and predict the land use change tendency and proven to be feasible and efficient. This study may provide a guide to future research in land use change. View full abstract»

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  • A method for land surveying sampling optimization strategy

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB) |  | HTML iconHTML  

    At present, how to select a limited but representative sample dataset from the existing land information database to guide the new round of land survey and assessment sampling is a critical issue for land sampling strategy study. As a case study to determine and analyze the sample capacity and sample spatial location of land survey sampling for the study area, Panyu District in Guangzhou, the paper developed the strategy based on the combination of classical sampling technique and geographical model under a certain confidence level and estimation accuracy requirement, and the performance of the sampling strategy was then evaluated by the Global Geary's C and the Quick-BP neural network model respectively. The test result showed that, compared with traditional c-means clustering sampling method, the accuracy of the sampling prediction based on local Moran index spatial clustering sampling method was increased by 13.57% which abstracted better the land information in the database. View full abstract»

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  • Studies on construction of rice pests multifactor spatial overlay model

    Publication Year: 2010 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (545 KB) |  | HTML iconHTML  

    Pests have been greatly damaging the rice yield in Guangdong Province, China in recent year. Traditional pests warning models, based on the mathematical statistics, only considering the relation between weather and monitoring data factors, are limited in large place. As a result, multi-factor spatial overlay model was construction to research the damage of Cnaphalocrocis medinalis in Guangdong Province. The factors include the Cnaphalocrocis medinalis situation, crop condition, and external environment data. By using the GIS technology, the model can make the thematic maps of Cnaphalocrocis medinalis damage in different time. The result can reproduce the spatio-temporal change of Cnaphalocrocis medinalis in Guangdong Province, as well as offer scientific support on prevention of rice pests. View full abstract»

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  • Study of spacializing social statistical data for carbon management

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (227 KB) |  | HTML iconHTML  

    In the fourth climate change assessment report, IPCC said: “Global warming is an indisputable fact.” And it was owing more than 90% to human activities. But NIPCC and some scientists insist that temperature variation is a normal natural fluctuation. Surface temperature variation of the planet is mainly affected by solar activity. Is human activities the really reason for global warming? To answer this question, we should first of all conduct a comprehensive study of carbon emissions due to human activities; then establish models to study carbon cycle mechanism of the terrestrial ecosystem process so as to clarify the relationship between global warming and carbon emission. Through the study of carbon cycle models in terrestrial ecosystem, and after figuring out carbon sources and emission computing methods in different spatial scales, this paper proposes a carbon emission spatial distribution simulation model which is simple in structure and widely in applicability by mainly using the methods of population data specialization, i.e., carbon emission spatial distribution simulation model based on population and land. After clarifying the application requirements and proposing the theoretical model, this paper designs the architecture of system, an SOA structure of four coverages that can be integrated into the digital city platform and can interact with other application systems. At last, the afore-mentioned theoretical model is realized and a prototype system developed. By using the system, multi-year of carbon emission spatial distribution has been simulated around the whole world, such as China and USA. View full abstract»

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  • Mapping land cover types as fuzzy sets

    Publication Year: 2010 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1552 KB) |  | HTML iconHTML  

    Researches have suggested that fuzzy sets form a more appropriate basis for land cover mapping than traditional Boolean classification. However, to give a crisp answer of which land cover types pixels in remote sensing images belong to, fuzzy clustering methods such as FMC always lost some subtle vague information. In this paper, the result of the Boolean classification using a fuzzy clustering method was analyzed and based on the result of the classification, we tried to map land cover types as type 1 fuzzy sets and type 2 fuzzy sets. Results show that type 1 fuzzy sets and type 2 fuzzy sets kept more subtle information that was lost in the processing of converting the fuzzy classification result to a Boolean one. And the structure of the study area can be more explicit represented. View full abstract»

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  • Study on shadow detection method on high resolution remote sensing image based on HIS space transformation and NDVI index

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1170 KB) |  | HTML iconHTML  

    This paper studied on shadow detection method on high resolution remote sensing image based on HIS space transformation and NDVI index. Firstly, the high resolution remote sensing image was transformed to HSI space, and the shadow of image could be detected with the characteristics of the low brightness and the high saturation in the area of shadow. Then according to the NDVI index of image, some of the ground objects, such as dark green grass, could be eliminated, and the shadow may be detected more efficaciously and accurately. View full abstract»

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  • Land use information release system based on Google Maps API and XML

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (873 KB) |  | HTML iconHTML  

    Web map service is a new map service mode actualized by the use of internet technology, computer technology and GIS technology. This article applies Web map service to the release of land use information, and tries to use Google Maps API and XML to build a network release system of regional land use information. The system integrates Google Maps data and user data effectively, carries out the display and management of land use information, and has a powerful public participation function. This study shows that Web map service based on Google Maps API and XML can play an important role in the release of land use information, which is also important in the information-based construction of land resources. View full abstract»

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  • Integrated land-use and transportation models

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    The need to mitigate the repercussions of urban sprawl over the last decades triggered the use of systematic urban plans that encompass land use, transportation and environmental dimensions. These plans aim at forecasting housing demand and analyzing the impacts governmental policy programs may have on urban development. A considerable number of integrated urban models have been developed and used in the regional transportation planning. Within this context, the history and future of integrated transportation and land-use urban models are discussed and indicated. The review of these models embarks on the process of building the future integrated urban model. View full abstract»

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  • An underground space object-oriented three-dimensional hybrid spatial indexing method

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB) |  | HTML iconHTML  

    In order to improve the efficiency of three-dimensional topological operations and specialized geographical model calculation, the efficient index mechanism to three-dimensional data is necessary. Taking into account of the underground space, the extending space of physical objects in the horizontal direction is far larger than the vertical direction. Thus, this paper uses a double-index mechanism that the horizontal and vertical indexes are separated to construct the spatial index to the underground space entity objects, and then puts forward an underground space object-oriented three-dimensional spatial data hybrid index mechanism - 3D RR-Tree. The construction, data insertion, queries and delete operations algorithm of the 3D RR-Tree is achieved. And then, the features and performance of 3D RR-Tree are analyzed. The method presented by this paper can satisfy the large-scale data fast scheduling needs of three-dimensional geological models. View full abstract»

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  • The data validity evaluation in land change survey based on remote sensing

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB) |  | HTML iconHTML  

    With based-data of DOM and vector data in land change survey and the research object of emphasis land class, we can establish an accurate, rapid and objective data validity evaluation system based on remote sensing to evaluate the validity of the updated data quantitatively in land change survey to second land survey in the future. This paper researched two main aspects, just as follows: the principle and basis of evaluation index, and the data processing procedures based on different evaluation index. We also explored the multi-factor compound assessment model of the thematic data based on data validity evaluation system of land change survey. In this research, we choose the case area in Yijiadu Town, Hunan Province, china, and cultivated land as the research object, to evaluate the validity of land change survey data quantitatively based on area ratio index. In this process, we have realized an integrated and automatic work mechanism, including remote sensing data processing, internal analysis, evaluation index generation, and auto-detection. View full abstract»

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  • An algorithm on discrimination of point-set in polyhedron based on three-dimensional convex hull

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    This paper presents an algorithm to determine whether a point-set composed of n-points is in the polyhedron or not-which is called the convex hull method. With this method, it is not necessary to judge whether each point in a point set within a polyhedron. By constructing three-dimensional convex hull of the remain target points, by means of collision detection of spatial objects to judge the adjacency relations of the polyhedron and the three-dimensional convex hull of the point set, and then to judge whether the vertices of three-dimensional convex hull are within the polyhedron, or the vertices of polyhedron are within the three-dimensional convex hull, thus which points are spots within the polyhedron can be determined. The algorithm can be applied not only to a general polyhedron, but also to concave polyhedron. The efficiency of checking whether the three-dimensional point set is within the polyhedron can be greatly improved by this approach, which is an important support for the realization of real-time spatial analysis algorithm for three-dimensional Geographic Information System (3D GIS). The experimental results show that the algorithm is simple, reliable and highly efficient. View full abstract»

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  • Distributed modeling environment for global climate change research

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (354 KB) |  | HTML iconHTML  

    Global climate change research requires cross-disciplinary cooperation. So there is an increasing call to the open modeling environment, as sharing and coupling of distinct domain models in a flexible, computationally efficient manner is the base of climate change research. But many existing models are deployed on geographic distributed servers and developed by different researchers with various languages, which require modelers familiar with models' details if want to use these models in their application. Therefore this problem commonly become a big barrier of model's sharing and assembles. In this paper, we present a system called DME (Distributed Modeling Environment) that provides an integrated modeling environment in completely open manner that enables researchers to share and integrate distributed models conveniently. To achieve that, a web service based approach is used and some features are implemented, which include: (1) web service standard based model encapsulation; (2) multiple distributed model coupling mode; (3) ontology based model management system. The system allows researchers to construct complex environmental models and applications quickly by integrating existing models service. At the end of this paper, an ongoing work is described as examples of its applications. View full abstract»

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  • Spatial distribution of soil erosion in a black soil region of Northeast China studied using remote sensing and GIS techniques

    Publication Year: 2010 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1304 KB) |  | HTML iconHTML  

    The soil erosion intensity and its spatial distribution of Mashezihe watershed located at Bin county in the typical gentle hilly black soil region of Northeast China were studied using the Surface Erosion Grading Indicator (SEGI) method and Universal Soil Loss Equation (USLE) model. Land cover types and vegetation cover fraction derived from the Advanced Land Observing Satellite (ALOS) remotely sensed data were employed in conjunction with other spatial datasets (DEM and soil texture) for assessing soil erosion in the ArcGIS platform. Results show that with the support of remotely sensed parameters by ALOS, the USLE model is able to identify more detailed information on soil erosion than the SEGI method. The total areas of very slight and slight erosion identified by the two methods are very similar. However, the USLE model produced larger areas moderately, highly, and very highly eroded than the SEGI method. It also classified severely eroded areas of 52.25hm2. According to grading regulation of soil loss tolerance issued by Ministry of Water Resources of China, the areas of very slight erosion (namely no obvious erosion phenomenon) and slight erosion identified by the USLE model are 21298.38 hm2 and 22919.19 hm2, accounting for 45.49% and 48.95% of the entire watershed, respectively, mainly in areas with slopes smaller than 5° and elevations lower than 200 m. Areas moderately, highly and very highly eroded are 1776.75, 486.56 and 286.88 hm2, equivalent to 3.79%, 1.04% and 0.61% of the study area, mainly in areas with slopes ranging from 8° and 15° and elevations ranging from 200 to 300 m. The severely eroded areas are sporadically distributed in areas with slopes above 15° and elevations higher than 300 m. View full abstract»

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  • Application of Radial Basis Function Network for spatial precipitation interpolation

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (291 KB) |  | HTML iconHTML  

    Spatial precipitation interpolation plays an important role in flood control and water resources management. However, the precipitation exhibits great spatial variability, and this makes spatial precipitation estimation difficult. This study discussed the applicability of Radial Basis Function Network (RBFN) for spatial precipitation interpolation. RBFN is usually employed for interpolation in multi-dimensional space, and it is composed of input layer, hidden layer and output layer, while the activity function of RBFN computes the distance between input vectors and the centre of neuron in the hidden layer. Based on the geographical location and the rainfall calculated by Inverse Distance Weighted (IDW), precipitation can be obtained in output vector through the nonlinear and linear calculation in RBFN. In this paper, RBFN was used for daily precipitation estimation in Xitiaoxi Watershed. In addition, IDW was also applied to compare its performance of rainfall estimation with that of RBFN. Cross-validation, which leaves one rainfall station out to estimate its precipitation by the others, was applied to measure the performance of each method. The results demonstrated that RBFN could estimate precipitation more precisely than IDW when there was high spatial variability for precipitation, while IDW was more appropriate for the interpolation of precipitation with low spatial variability. From this study, it was found that it would be better to choose suited method of spatial precipitation interpolation according to the conditions of spatial precipitation distribution. View full abstract»

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  • Production and accuracy analysis of high quality TerraSAR-X DOM

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3631 KB) |  | HTML iconHTML  

    The production and accuracy analysis of high quality TerraSAR-X DOM are presented. The main focus is given to how to control the accuracy of ortho-rectification framework. Two SpotLight scenes of 1 meter resolution images and two ScanSAR scenes of 3 meter resolution images in China are used as the experimental data. Based on the proposal ortho-rectification framework, the absolute accuracy of TerraSAR-X DOM can reach to less than three pixels. View full abstract»

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  • Registration of multi-resolution point clouds from terrestrial laser scanners

    Publication Year: 2010 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2105 KB) |  | HTML iconHTML  

    Registration of point clouds from terrestrial laser scanners plays the key role in feature extraction, 3D object modeling and 3D scene classification. An automated registration algorithm of pair-wise point clouds is presented, which is based on multi-resolution data created from raw point clouds, using geometric properties and point to point improved adjustment method, iteratively calculates six transformation parameters. RANSAC algorithm is also used to get reliable corresponding points. Convergence region and rate of proposed point clouds registration algorithm have been tested on a variety of data sets. Quality analysis of registration method is tested by using check points. View full abstract»

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  • An enhanced routing method with Dijkstra algorithm and AHP analysis in GIS-based emergency plan

    Publication Year: 2010 , Page(s): 1 - 6
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (329 KB) |  | HTML iconHTML  

    Practical emergency routing plays an important role in emergency response for fire forces. This paper present an enhanced static emergency routing method, combining Dijkstra algorithm and analytical hierarchy process (or AHP) for the emergency planning. Firstly, time length weighted model was build up based on minimum time-consumption criteria, with the consideration of seven important impedance factors that influenced the fire forces' routing. Then AHP was employed to calculate weights of the impedance factors for the model parameters. And then using Dijkstra algorithm to solve the weighted time length model, a new improved routing has then been achieved. Finally the some city's GIS-based emergency routing map was taken as an example, experiments were carried out using the established model to produce the emergency routing for the fire forces. Comparisons between the original Dijkstra algorithm's results and the improved mode's results for the emergency routing has been made, and with the real fire forces' routing experience acquired from age long experiences, improved model's result shows the consistence with real situation. This research meets the urgent need of fire forces, and can be of great help to the emergency planning for the fire forces. View full abstract»

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  • A novel algorithm for reducing redundancy of the massive spatial data

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (334 KB) |  | HTML iconHTML  

    Gaussian pyramid framework (GPF) and Laplacian pyramid framework (LPF) are the two main frameworks used for transmission and structure of spatial image and geometric data. LPF is the main approach for progressive transmission of spatial image data. This paper discusses the issues in structure, transmission and storage efficiency of spatial data in the current spatially distributed visualization system. Later in the paper, a novel approach is introduced to query, structure and transfer spatial data base on the Laplacian pyramid framework. This new approach transforms the spatial image data into high-frequency and low-frequency data, builds (spatial) index for transformed frequency data within different ranges. By eliminating the data redundancy in different ranges, this approach decreases the storage consumption and Network data traffic for transmission while enables the progressive transmission of spatial image data. In addition, architecture of searching between clients' renderer and storage structure at server was provided. View full abstract»

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