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Coal Bed 3D Modeling Based on Set Theory and Unparallel ATP

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Coal Bed 3D Modeling Based on Set Theory and Unparallel ATP Sun Yat-sen University - University of Cincinnati Geoinformatics’2008; Guangzhou, China, 28-29 June 2008 No. 001 Coal bed 3D modeling based on Set Theory and unparallel ATP Zhu Qingwei Dept. of Surveying, Xi’an University of Science and Technology, Yanta Road 58, Xi’an, P.R.China, 710054 ABSTRACT Although spatial objects of our world have an intrinsic three dimensional (3D) natures, 3D data modeling and 3D data management have so far been neglected in spatial database systems and Geographical Information Systems, which map geometric data mainly to two-dimensional abstractions. But increasingly the third dimension becomes more and more relevant for application domains. Large volumes of 3D data require a treatment in a database context for representing, querying, and manipulating them efficiently. After detailed researching on the mechanism of Modeling of the Geology Body, a new compositive data model is brought forward based on the joining of set theory (for short ST) and Unparallel Analogical Triangular Prisms (for short UATP). Spatial entity is decomposed into five fundamental kinds of data types in this model, including 3D point (3DP), 3D line (3DL), 3D sample surface (3DSS), 3D surface (3DS), and 3D volume (3DV). Meanwhile, nine data structures concerned are put forward, including node, TIN edge, side edge, arc edge, TIN surface, sample surface, quadrangle, UATP, and 3DSVC. Based on this, system of modeling and simulation for spatial entity are designed. Fault and mining roadway are presented as examples. This paper aims at investigating the complex inherent features of 3D data and presents an abstract, formal data model called ST (Set Theory). The data model comprises a set of three- dimensional spatial data types together with a collection of geometric set operations. The result shows that the data model based on set theory and UATP can improve speed and accuracy degree during process modeling. So, the main point in this paper is reconstruction of 3D Geological models, other question, such as: topological relations, data volumes as a key question for further study. Keywords: Set Theory, Unparallel Analogical Triangular Prisms, 3D Spatial Data Types, Spatial Database, Coal Bed 1 Sun Yat-sen University - University of Cincinnati Geoinformatics’2008; Guangzhou, China, 28-29 June 2008 No. 002 Topological spatial relation calculation in constrained Delaunay triangulation: an algebraic method Jiatian Li1, 4, Chunxiao Wang2, 4, Li Ma3, 4, Hao Chen3, 4, Dehong Yang1, Xuequn Wu1 1 Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2 Department of Geographical Science, Yuxi Normal University, Yuxi 563100, China; 3 School of Remote Sensing Information Engineering, Wuhan University, Wuhan 430079, China; 4 National Geomatics Center of China, Beijing 100044, China; ABSTRACT Topological spatial relation between spatial objects is a very important topic for spatial analysis, query and reasoning in Geographic Information Science (GIS). In this paper, an algebraic method using constrained Delaunay triangulation (CDT) for topological spatial relation is presented. In the part of foundational theory, (i) prove CDT is simplicial complex in 2. (ii) import chain structure in CDT and prove including & approximating theorem and reduced including & approximating theorem, and are used for estimating left, middle and right side properties of triangle. (iii) define the region in CDT and establish region algebra (RA), which use the set of region as computational space and use the intersection operator as a binary operation. (iv) describe basic forms of node and chain which are contained in a set of triangles. In the part of spatial relation calculation, (i) describe spatial object as three entries, i.e. exterior, boundary and interior, with left, middle and right of triangle and their combination. (ii) establish the topological spatial relation calculation model-region nine intersection model (R9IM), which is used the intersection operation and the form operation as basic operations. (iii) calculate thirty-three spatial relations of simple objects with R9IM in the practice application of topological examination. Keywords: Topological spatial relation calculation; constrained Delaunay triangulation; region algebra 2 Sun Yat-sen University - University of Cincinnati Geoinformatics’2008; Guangzhou, China, 28-29 June 2008 No. 003 Expanded Q4 Quality Assessment for Pan-Sharpened MultiSpectral Image WANG Zhongwu, ZHAO Zhongming Institute of Remote Sensing Applications, Chinese Academic Sciences, Beijing, China, 100101 ABSTRACT In this paper, we took into account both the spectral information and the spatial information and estimated how well the needed information contained within the multispectral (MS) and panchromatic (PAN) images was represented by the pan-sharpened image. Based on that, we proposed a new quality index which could be seen as an expanded index of the global quality measurement Q4. In our method, we first measured the spectral information preserving quality between the MS image and the fusion result. Then, we constructed a virtual spatial detail image considering the spatial resolution ratio between the source MS image and the PAN image, and also extracted the detail image contained in the merged image using the same technology, followed by a spatial information preserving quality index calculated from these two detail images. At last, we integrated the two indices by means of weighted addition determined by fusion model. To illustrate the superiority of this new index, we took experiments on two pairs of ZY-2 PAN and ASTER MS (1 2 3 bands) remote sensing imageries, and adopted the tradeoff FIHS fusion method in which the tradeoff parameter was set to different values standing for different fusion models. After using the proposed index to assess the quality of fusion, we think that the new index is compliant with subjective evaluations and could therefore be used to compare different image fusion or to find the best parameters for a given fusion model. Finally, we gave an experiential weight parameter of the quality index while assessing the tradeoff FIHS fusion with images from these two sensors by the author’s experiments. Keywords: pan-sharpen, non-reference quality assessment, fusion model, quaternion algebra, weight parameter 3 Sun Yat-sen University - University of Cincinnati Geoinformatics’2008; Guangzhou, China, 28-29 June 2008 No. 005 Assessments of Hangzhou urban growth near the Xixi wetland using remote sensing data Qian Cheng Department of Environmental Resources Management & City Planning, college of tourism, Zhejiang Gongshang University, Hangzhou, 310035 ABSTRACT This study has demonstrated that quantification of subpixel percent imperviousness over time provides a good estimate of urban LCLU change. Furthermore, the combination of Landsat satellite data and high-resolution Quickbird imagery provides the necessary spatial information needed to support subpixel impervious change detection. Subpixel percent imperviousness mapping also provides more information on the spatial extent and intensity of urban LCLU change. This approach provides considerable flexibility in capturing the heterogeneity of urban landcover characteristics. Quantification of urbanization through mapping impervious surface change provides useful data for urban dynamic simulation including model calibration and validation. Regrouped and categorized sub- pixel ISA data to remove uncertainties for a small portion of total ISA pixels was performed. After regrouped and categorized sub-pixel ISA data to remove uncertainties for a small portion of total ISA pixels, the model was used to simulate the historical development of impervious surfaces in the Hangzhou. After the calibration process, the best parameters that matched current and historical growth patterns were selected from different urban density change predictions. The model was then used to make analyze of impervious surface. The results showed lower density urban development to be widespread throughout the wetland, whereas much of the medium to high-density urban development have occurred in proximity to existing urban centers. Keywords: Urban; Remote sensing; Assessments; Impervious surface 4 Sun Yat-sen University - University of Cincinnati Geoinformatics’2008; Guangzhou, China, 28-29 June 2008 No. 008 The conjugated evolvement of land use change with landscape pattern based on RS/GIS in watershed scale: A case study of middle and lower reaches of the Hanjing Basin Guangming Yu, Shan Yang, Limei Hu, Zhanfa Tu, Xiaoxue Sun, Qiuyue Luo College of Urban and Environmental Sciences, Central China Normal University, Wuhan 430079, P R China ABSTRACT The conjugated evolvement between land use/cover change (LUCC) and landscape pattern are appeared as their relevancies in space-time scale. In this paper, the data resources are combined the conventional maps and statistics with two temporal TM images in the middle and lower reaches of the Hanjing Basin in 1995 and 2000, and the system analysis are made to the coefficient of land use intensity (the COLUI), composite index of landscape pattern (the CILP), and their changes. The platform of spatial data processing is software ERDAS and ARC/INFO, and the attribute data are calculated with software ACCESS, EXCEL and SPSS. The results of statistical and correlation analysis show the rules of conjugated evolvement between LUCC and landscape pattern, that is, there is a remarkable negative correlation between
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