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Geoinformatics, 2011 19th International Conference on

Date 24-26 June 2011

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Displaying Results 1 - 25 of 536
  • Committees of “2011 19th International Conference on Geoinformatics”

    Publication Year: 2011 , Page(s): 1 - 2
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  • [Copyright notice]

    Publication Year: 2011 , Page(s): 1
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  • [Conference Submissions]

    Publication Year: 2011 , Page(s): 1
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  • Surface modelling of annual precipitation in the DongJiang river basin, China

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (142 KB) |  | HTML iconHTML  

    Precipitation is the major climatic factors. However, what the limited meteorological station can provide are discrete observational data. At present, in the field of GIS, the methods which are widely used in the precipitation spatial interpolation include IDW, TIN, Kriging, Spline and so on. Based on the precipitation data from 65 sampling points in the DongJiang river basin by the China Meteorological Administration, this paper integrates the advantages of the spatial autocorrelation model and spatial differentiation model, with the advantages of the spatial autocorrelation model, classical interpolation model (IDW, Kriging, spline) and HASM are used to interpolate the annual precipitation. Interpolate result shows that HASM algorithm is much more accurate than classical interpolation algorithm. So the residual anomaly for local change is simulated by HASM algorithm. The results show that estimated annual precipitation correctly replicates real spatial distribution of precipitation qualitatively and quantitatively. View full abstract»

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  • Land use/cover change analysis in Wuhan city based on RS and GIS

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    The land use/cover change is a frontier subject in the research area of the current global environmental change. Typical regional LUCC case study is an important way to recognize of global change. Land use/cover change temporal and spatial detection process is that accumulates space-time continuum of land use / cover data, then establishes the multi-source space-time data platform of LUCC. The space-time distribution rules of LUCC are researched on that data platform based on RS and GIS. This study area is located in Wuhan city, using interpretation results of the TM image of Landsat 5 in 1996 and 2006. It takes a quantitative research on Land Use / Cover Change in Wuhan city based spatial analysis of GIS and methods of mathematical statistics in 1996-2006. The results show that:(1) General characteristics of land use/ cover show that cropland, grassland and unused land have decreased, forest, water and construction land area have increased in Wuhan city from 1996 to 2006; (2) These three kinds of changes of cultivated land into forest land, construction land and water which distribution are the most widely, and conversion rate is the largest in the 10 years. View full abstract»

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  • Information extraction of fast-growing plantation based on remote sensing

    Publication Year: 2011 , Page(s): 1 - 4
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    By allowing the estimation of forest structural and biophysical characteristics at different temporal and spatial scales, remote sensing may contribute to our understanding and monitoring of planted forests. In this paper, we used multi-temporal data from Landsat TM to investigate 9-year time-series of the Normalized Difference Vegetation Index (NDVI) in Dongying city, Shandong province, China. According to the short rotation and fast update characteristics of fast-growing plantation, found oscillations and obvious deviations of NDVI values from the normal NDVI variation trends, and extract fast-growing plantations distribution areas of Dongying, Shandong province, China. View full abstract»

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  • Comparison of interpolation methods for spatial precipitation under diverse orographic effects

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    In this study, 4 spatial interpolation methods, including Thiessen polygon, inverse distance weighted (IDW), ordinary kriging (OK), and ordinary cokriging (OCK), were adopted for spatial monthly precipitation interpolation. As confirmed by the results, OCK which adopt elevation as secondary variable was superior to other methods. On the other hand, the performance of OCK was also compared with that of OK for different correlation between rainfall and elevation, and the results showed that OCK could not consistently outperform OK. When the correlation coefficient was small, OK got more accurate estimation compared with OCK, while OCK performed much better than OK as the correlativity was evident, and the gap of their estimation accuracies enlarged greatly with increasing coefficient. Finally, by integrating OK and OCK based on their respective superiority, we obtained the results with less error than those of OK and OCK respectively. View full abstract»

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  • A consistency analysis of MODIS MCD12Q1 and MERIS Globcover land cover datasets over China

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (213 KB) |  | HTML iconHTML  

    Global land cover data plays an important role on the global change research. At present, there are a variety of global land cover datasets. Those datasets are based on different classification systems and employ different methodologies. The inconsistencies may be a problem for studies of global change. This study analyzes the consistency of MCD12Q1 and Globcover datasets using type area consistency and spatial consistency at a national level and regional level. The results show that at the national level, the correlation coefficient of the type area totals of the two datasets is 82.98% and Kappa coefficient is 27.21%. Correlation coefficient of the type area totals of the two datasets at Northeast region, North China, Southwest region, Northwest region, Central and Southeast region and Qinghai-Tibet Plateau are 43.84%, 69.30%, 18.53%, 92.98%, 42.40%, 91.10%, respectively and Kappa coefficient are 7.41%, 20.45%, 6.33%, 32.63%, 16.37%, 26.15%, respectively. View full abstract»

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  • Topology constrain for river dimension-reducing generalization in land-use map

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (159 KB) |  | HTML iconHTML  

    Topological consistency which plays an important role in land-use map is a difficult problem for map auto generalization. This paper concentrates on the topological preserving of river's dimension-reducing generalization in the land-use map. We propose a method for handling the conflicting constraints involved in generalizing a river polygon (double-line river) into a single-line river. It includes mainly two steps: First, extract the medial axis as a centerline for river polygon base on the constrained delaunay triangulation model. Then, expand the polygons' boundaries which are shared by the double-line river's bank towards the collapsed river's centerlines base on the topology and computational geometry. Experiments are tested against land-use maps at 1:10k scale. The results illustrate that this method can keep the topological constraint well for river dimension-reducing generalization in land-use map. View full abstract»

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  • Spatial analysis of regional economic development based on GIS in Chongqing, China

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (171 KB) |  | HTML iconHTML  

    The differences in development elements lead to spatial disparities of regional economic development. The study, using principal component analysis and spatial autocorrelation method, has found that the economic development in Chongqing was featured with strong positive spatial autocorrelation. The positive spatial autocorrelation appears in two forms named "HH" type and “LL" type. According to the survey and research results, the main city of Chongqing belongs to "HH" type, the southeast and the northeast, such as Pengshui, Fengjie, Wushan and Wuxi, belong to “LL" type. This spatial autocorrelation is caused by both natural and social factors. The results of overlay analysis show that strong spatial gathering in the northeast and southeast is caused by hilly land form with high slop and elevation, while the economic disparities and spatial gathering in other areas are more possibly caused by social factors, including the advantages of transportation and the early economic development. View full abstract»

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  • Syntax-based construction theory for symbols in web thematic maps

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    The construction for thematic map symbol is a very complex and intelligent process. This symbol can be automatically generated and easily shared on the web through the syntactic characteristics of statistical indicators and cartography visualization. This paper expounds the symbol types, inner structure and its design pattern. And a syntactic construction theory based on phoneme (thematic map primitive) - word (single thematic symbol) - sentence (combined symbols or complex symbols) structure model is put forward for automatic construction of thematic map symbol. As a result of this research, symbols can be defined using cartographic primitives which are arranged according to its syntactic principles. Its concept and schema is discussed, and some examples are presented. View full abstract»

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  • Applying GPU and POSIX thread technologies in massive remote sensing image data processing

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (549 KB) |  | HTML iconHTML  

    Since the introduction of CUDA (Compute Unified Device Architecture), GPU (Graphics Processing Unit) was used in various fields rapidly. Some researchers used the GPU computing technology in remote sensing image processing, and revealed that one hundred times speedup could be obtained. Current GPU-based approaches need to load all the image data at a time prior to image processing. However, the current computer memory and GPU memory are limited, and are not big enough for loading the remote sensing image data which are always massive. Hence, current GPU-based image processing approaches cannot be directly applied in remote sensing image processing. Under this situation, this paper proposes a dual-parallel processing mechanism, which is based on GPU and POSIX thread technologies, in massive remote sensing image data processing. Experimental results illustrate that our methodology can not only deal with massive remote sensing image data, but also improve the processing efficiency greatly. View full abstract»

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  • GIS-based hydrologic modeling in the Qinhuai River Basin associated with land use changes

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB) |  | HTML iconHTML  

    In the last thirty years, the Qinhuai River Basin has experienced a rapid urban development and population growth, resulting in great land use changes. The SWAT (Soil and Water Assessment Tool) model was applied to simulate daily runoff associated with land use changes. The spatially distributed parameters were obtained with the help of GIS (Geographic Information System) interface. The runoff calibration was conducted from 1988 to 1997, and nine years (1998 to 2006) of data were used for validation, with four land use maps, representing land use conditions of corresponding water years. Results showed that simulation of daily runoff was satisfactory, indicating SWAT had the capability of adequately simulating the effect on runoff from the temporal and spatial variability in the Qinhuai River Basin. This study was also an essential basis for further assessing the impact of land use changes on hydrology and hydrological response to different land use scenarios. View full abstract»

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  • Flood submergence simulation and risk analysis based on GIS in plain area

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (164 KB) |  | HTML iconHTML  

    A grid-based GIS approach to flood submergence simulation and risk analysis was proposed using an integration of GIS, telemetering stage and high resolution remote sensing image (ALOS), in southeast plain of Yinzhou district. The digital elevation model (DEM) was created based on 1:10000 topographic maps and 1:5000 thematic maps, and several pre-processing methods, including depression filling, urban terrain and river network correction, were applied. After that, the “source flood” algorithm based on visiting every node of the stack, was adopted to simulate the scope and depth of the inundation with DEM and real-time stage data from the telemetry stations. Finally, flood risk was evaluated by taking the factors of flood submergence depth and hazard-affected body. The combination of the real time flood simulation and risk analysis provides an effective decision-making and disaster assessment for the study area. View full abstract»

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  • Monitoring the land surface temperature using MODIS data in Zhejiang of China

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (731 KB) |  | HTML iconHTML  

    With the impact of global events as urbanization, industrialization and other human activities, also like climate change, the regional thermal environment has introduced a series of problem, e.g., Urban Heat Island effect and climate disasters. To address this issue, it is necessary to monitor the spatial and temporal patterns of regional thermal environment. Land Surface Temperature (LST) is an important indicator for environment monitoring. Zhejiang province is major part in Yangtze river delta region of China, which is the most rapidly urbanization in the world. In this report, based on the MODIS remote sensing data, Land Surface Temperature (LST) of Zhejiang province in China is retrieved by Split-Windows Algorithm successfully. The characteristics of Zhejiang Province regional thermal environment are quantitatively analyzed through spatial statistical analyses. The results show that the remote sensing data is effective and high accuracy for retrieving and estimates reasonably LST. View full abstract»

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  • Evaluation of spatial accessibility to town and rural in a GIS environment: A case study of Dachang County

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (294 KB) |  | HTML iconHTML  

    Evaluation of spatial accessibility are always the research hotspot in space planning, geography and so on. This article makes full use of two GIS-based accessibility measures including the two-step floating catchment area method and the gravity-based method to examining spatial accessibility to town and rural in Dachang County. Based on communicant and socioeconomic data of Dachang County in 2009, the paper assesses the variation of spatial accessibility to town and rural in Dachang County, and analyzes the sensitivity of results by experimenting with ranges of threshold travel times in the two-step floating catchment area method and travel friction coefficients in the gravity model, and so as to provide the scientific references for the planning distribution of public facilities in the county. View full abstract»

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  • Developing green space ecological networks in Shijiazhuang city, China

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (298 KB) |  | HTML iconHTML  

    Green spaces, an important component of ecosystems, not only provide many environmental and social services that contribute to the quality of life, but also are the important carriers for biodiversity conservation. Rapid urbanization has led to fragmentation of green space, and it is a great threat for biodiversity conservation. One of the key tasks for planners is to optimize the benefits of green spaces. This study introduces a “shortest path” method for developing green spaces ecological networks in Shijiazhuang city through (1) land use and green spaces analysis based on GIS; (2) quantifying simulated potential corridors based on the shortest path method to develop green space ecological networks; (3) applying the gravity model in evaluating the interaction intensity of the green patches to extract the significant ecological corridors. Some suggestions for green spaces planning were given, such as improving the connection of the green patches and optimizing the green space pattern. View full abstract»

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  • Application of extension theory model in the risk assessment of soil erosion: A case study of Makeng area in Fujian Province, China

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (174 KB) |  | HTML iconHTML  

    Mining exploration destroys the soil structure, vegetation coverage, landform and physiognomy, especially, the non-renewable soil layer. It has greatly hindered the sustainable development of the mining area and caused great losses. Based on existing soil erosion data, contradictory problems between the mining exploration and soil degradation were analyzed. The basic data was obtained using GIS and RS technology and the risk assessment of soil erosion was done by the extension theory model. Comparing the extension theory model and digital model with GIS technology, the extension model is more scientific than the digital model. Unfortunately however, it cannot combine the spatial and attribute data, and its evaluation factors also need further research. View full abstract»

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  • Spatial range expression method of geographical entity with uncertain boundary

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB) |  | HTML iconHTML  

    In commonsense geographical cognition, people adopt qualitative methods to express geographical phenomenon in natural language. But it lacks quantitative approximate expression by this way, so could not describe the geographical entity with uncertain boundary. In daily life, people can ascertain one uncertain geographical entity's position through an anchor point, but cannot explain its certain geography boundary range. In this paper, we have made an experiment on the mountain features of 1:250000 topographic map data, adopting three different methods: Human-computer interaction technology, Irregular buffer analysis and Voronoi diagram to measure the mountain's approximate range. Then we discussed the feasibility of each method. Finally we realized the function of overlay analysis with the three range image. When we used different scale topographic map, we could find different results. The results indicated that the boundary created by our methods could reflect whether people's commonsense geography cognition was right or wrong to some degree. View full abstract»

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  • Spatio-temporal processes and causes analysis of Jiayuguan oasis in China over a 23a period

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (117 KB) |  | HTML iconHTML  

    Environmental change of oases in the arid regions of China is a subject of recent concern. Although many changes have been recorded qualitatively through the use of photography and historical reports, little quantitative information has been available on regional scale. Basing on RS images which all were rectified, interpreted and classified with ArcGIS or Erdas softwares, this paper studied the spatio-temporal processes and causes of Jiayuguan oasis over a 23a period. It also evaluated the condition of Jiayuguan oasis in relate to human being and natural distributions. The result shows that, during the years between 1986 and 2009, oasis area increased from 109.93 to 189.68km2, total area of oasification land has an increase tendency. Factors influencing oasification occurrence is human being activities including urban economic development, fixed assets investment, transportation construction, state and local policy changes and urban population growth. Other factors also affected it but can be ignored duing to the short scale of study time. View full abstract»

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  • Indoor evacuation routes planning with a grid graph-based model

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (185 KB) |  | HTML iconHTML  

    At present, application of GIS is in a process of transition from macro space to micro space, such as indoor space, a kind of micro environment that has a smaller scale than outdoor space. There have been some applications for indoor space, covering issues like path finding, emergency planning, object tracking, etc. Behind these applications, indoor spatial models are needed to illustrate how built environments are spatially represented. Although some modeling approaches have been proposed, most of them focus only on either structural or topological properties. In view of this problem, recently a grid graph-based modeling approach considering a built environment as a continuous framework is presented, which is able to combine both geometrical and structural properties. In this paper, we employ this approach to implement route analysis based on a hotel floor plan. The result might be applied to the planning for evacuation routes. View full abstract»

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  • Urban carbon emissions trends and the effect of mitigation measures

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (167 KB) |  | HTML iconHTML  

    This paper, taking Beijing, Tianjin, Shanghai of China for example, discussed the method of urban carbon emissions prediction. Using Yongbin Zhu and Zheng Wang's optimal growth model to study the energy carbon emissions of cities under steady economic growth, and getting forest carbon sinks of cities with CO2FIX model, then we could result in net carbon emissions of cities. The results showed that in Beijing, Tianjin and Shanghai, net carbon emissions presented inverted U-curve of growth, but were not very different from the situation when we didn't consider forest carbon sinks. Scenarios showed that speeding up technological progress in Beijing and Shanghai to reduce energy carbon emissions had no significant effect, but in Tianjin it had an obvious effect. View full abstract»

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  • Evaluation of intensive land use and the growth patterns in urban fringe: Using AHP and GIS methods

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (119 KB) |  | HTML iconHTML  

    Urban fringe area refers to a transition or interaction zone, where urban and rural activities are juxtaposed, and landscape features are subject to rapid modifications, induced by human activities. In the background of sustainability development and urban-rural integration, the models of land use and growth patterns in urban fringe are the new hot topic in developing countries, especially in China. In this paper, we set down the research route and method in establishment of indicator system. Using integrated AHP method based on GIS technology, we create one optimal indicator system to reflect the goal in this study based on lots of literatures focused on the research for cities. Four towns in the fringe of Suzhou city are as the cases and were analyzed the position of land intensification use and growth patterns. In the end of this paper, some relative problems and some measures to resolve them were point out. View full abstract»

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  • Modeling and implementation of situation symbols in emergency thematic cartography

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB) |  | HTML iconHTML  

    According to the needs of emergency thematic cartography and the China's existing `Specification for the military symbols', the types of situation symbols that may be used in emergency thematic cartography were summed up in this paper. A comprehensive modeling was raised for these situation symbols and it is flexible for emergency thematic cartography. There are four kinds of situation symbols: contour symbol, simple arrow symbols, single arrow symbols and combined arrow symbols in this paper. The position line of the symbols is a Bezier curve or a polyline. The oblique axis parabolic algorithm and the Hermite interpolation algorithm are selected for smoothing the position lines of the symbols. The Douglas-Peucker algorithm is picked out for scattering the position curve. At last, this paper developed a cartographic system based on the national fundamental geographic information, and realized the modeling and drawing of the situation symbols with the cartographic system. View full abstract»

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  • Analysis of space-time pattern in evapotranspiration and meteorological driving factors over the source region of the Yellow River

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB) |  | HTML iconHTML  

    To analyze the space-time distribution characteristic of evapotranspiration (ET) in the source region of the Yellow River, 16-day synthetic MODIS remote sensing products data, hydrological and meteorological data from 2000 to 2009 were used to build an ET dataset with long time series by SEBAL model, and then study the correlation between ET and meteorological factors in space. The quantitative estimation of the regression model has been established on different time scales and the model and its error was tested and analysed respectively. The results demonstrate that the prediction model built for the study area can pass the significance test at 0.01 confidence level is suit for the prediction of ET in different regions and seasons. View full abstract»

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