Data matching of building polygons at multiple map scales improved by contextual information and relaxation     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

The aim of matching spatial data at different map scales is to find corresponding objects at different levels of detail (LODs) that represent the same real-world phenomena. This is a prerequisite for integrating, evaluating and updating spatial data collected and maintained at various scales. However, matching spatial data is not straightforward due to the ambiguities caused by problems like many-to-many correspondence, non-systematic displacement and different LODs between data sets. This paper proposes an approach to matching areal objects (e.g. buildings) based on relaxation labeling techniques widely applied in pattern recognition and computer vision. The underlying idea is to utilize contextual information (quantified by compatibility coefficient) in an iterative process, where the ambiguities are reduced until a consistent matching is achieved. This paper describes (1) a domain-specific extension to previous relaxation schemes and (2) a new compatibility coefficient that exploits relative relationships between areal object pairs in spatial data. Our approach were validated through extensive experiments using building data sets at 1:10k and 1:50k as an example. Our contextual approach showed superior performance against a non-contextual approach in general and especially in ambiguous situations. The proposed approach can also be applied to matching other areal features and/or for a different scale range.  相似文献   

Towards a National Atlas of the Netherlands as part of the National Spatial Data Infrastructure     

《The Cartographic journal》2013,50(3):225-231

Abstract

This paper is about different worlds, and how we try to unite them. One of these worlds is the world of National Atlases: collections of complex, high-quality maps presenting a nation to the geographically interested. The second is the world of National Spatial Infrastructures: highly organized, standardized and institutionalized large collections of spatial data and services. In the paper, we describe the two worlds and their fundamental differences and we present the theoretical framework in which these worlds could be united. We introduce a test bed we are using to try out the theoretical framework in a real-life use case. In the architecture of that test bed, we introduce a National Atlas Services layer and describe how we have created an Atlas Map Viewer component, using the Open Web Platform. We conclude by commenting on the results thus far and taking a look into future developments.  相似文献   

Fuzzy outranking approach: A knowledge-driven method for mineral prospectivity mapping     

《International Journal of Applied Earth Observation and Geoinformation》2013

This paper describes the application of a new multi-criteria decision making (MCDM) technique called fuzzy outranking to map prospectivity for porphyry CuMo deposits. Various raster-based evidential layers involving geological, geophysical, and geochemical geo-data sets are integrated for mineral prospectivity mapping (MPM). In a case study, 13 layers of the Now Chun deposit located in the Kerman province of Iran are used to explore the region of interest. The outputs are validated using 21 boreholes drilled in this area. Comparison of the output prospectivity map with concentrations of Cu and Mo in the boreholes indicates that the fuzzy outranking MCDM is a useful tool for MPM. The proposed method shows a high performance for MPM thereby reducing the cost of exploratory drilling in the study area.  相似文献   

基于栅格数据的山区人口分布规律研究     

曹伟超  文学虎  申学林  应国伟  陶和平 《测绘软科学研究》2013,(6):23-27

在人口密度栅格数据基础上定量分析了山区人口分布与地形、土地利用、道路、河网以及居民点之间的关系。结果表明山区人口密度与高程、坡度呈显著负相关,相关系数在-0.83以上;与道路、河流存在类似关系,即距离越远人口密度越低,与河流相关性较弱;居民点密度一定程度上直接反映了人口的分布状态,人口密度与中心城市距离存在较高的负相关性,相关系数达到-0.804;与土地利用关系密切,建设用地和耕地中人口密度明显高于其他类型。  相似文献   

基于车载激光点云数据的道路模型重建     

熊爱武 《测绘软科学研究》2013,(6):86-88

在SSW车载激光扫描点云数据的基础上,研究了提取道路边线点集的方法,并对道路边线点进行均匀抽稀,最后按照道路纵断面shape构建道路模型。试验表明该方法能成功地提取出道路边线点,建立道路模型。  相似文献   

GIS数据处理技术的应用     

唐志静 《北京测绘》2013,(3):73-77,81

北京市基础测绘是一项重要的工作,为加快基础测绘地理信息数据的生产和建库,研制出了大比例尺1:500地形图数据加工工艺流程。介绍了北京市测绘设计研究院设计的一种数据模型的数字化生产过程,使生产的DWG数据图形的可视化显示与图形的属性数据有机的结合在一起,能直接派生满足制图需求的模拟图,又能派生GIS数据。  相似文献   

不同样本分布的SVDD单目标土地覆盖分类方法研究     

帅冠元  张锦水  朱爽  潘耀忠 《遥感学报》2013,17(6):1627-1345

  相似文献   

ERDAS APOLLO软件在海量空间数据管理中的应用     

熊江  陈刚  黄智 《国土资源信息化》2013,(4):60-62,72

本文介绍了一种全新的、基于ERDAS APOLLO软件实现海量空间数据管理方法。文章在介绍ERDAS APOLLO软件的特点及应用情况后,详细阐述了海量影像组织、空间数据服务发布的流程与方法,并用来实现重庆市国土行业海量空间数据的统一管理,对这种管理方法的应用情况作了总结。  相似文献   

重庆市国土房管行业数据中心运行维护管理探索     

闫亮  陈鹏  尹子龙 《国土资源信息化》2013,(4):29-33

本文深入分析了重庆市国土房管行业数据中心运行维护工作的主要特点,以技术管理为抓手,以提供优质服务为理念,介绍了行业数据中心在运行维护、IT管理过程中的经验,以及在管理措施方面的探索和取得的成绩。  相似文献   

A method to generalize stream flowlines in small-scale maps by a variable flow-based pruning threshold     

Michael Tinker  Peter Anthamatten  Jeff Simley  Michael P. Finn 《制图学和地理信息科学》2013,40(5):444-457

The aim of this paper is to explore and describe a method of automated generalization designed to produce a map which strikes a balance between cartographic and hydrologic representations. Following a discussion of scholarly literature on generalization, we describe a novel method for automated generalization of hydrographic stream data, using the National Hydrography Data Set (NHDPlus) as an example.

Traditional hydrography shows a fairly uniform density of stream flowlines over space. While this is pleasing to the eye, traditional methods tend to under-represent rivers in humid areas and over-represent them in arid areas. We address this problem through a method in automated generalization to produce a high-quality presentation of hydrographic data, suitable for display as a wall map or in an atlas. Streams are pruned based on a variable flow threshold, derived from the local mean annual precipitation by a regression equation.

After running the model using different parameters, we produce a more satisfactory portrayal of stream networks in the United States that communicates the flow of water through rivers and reflects the regional climate. Specific advantages in generalizing with variable flow threshold include (1) the method allows for fine gradations in output scale; (2) the output maps tend to minimize density variations in the raw data; (3) the subjective criteria are easily derived; and (4) the method can be performed rapidly on large data sets, as long as the stream data has been enriched with reliable flow rates.  相似文献