scholarly journals A Refined Lines/Regions and Lines/Lines Topological Relations Model Based on Whole-Whole Objects Intersection Components

2021 ◽  
Vol 10 (1) ◽  
pp. 15
Author(s):  
Xiaoguang Zhou ◽  
Hongyuan He ◽  
Dongyang Hou ◽  
Rui Li ◽  
Heng Zheng
Keyword(s):  
Quality Control ◽  
Spatial Data ◽  
Topological Type ◽  
Node Degree ◽  
Prototype System ◽  
Topological Relations ◽  
Line Region ◽  
Adjacent Point ◽  
Representation Method ◽  
Intersection Sets

Refined topological relations play an important role in spatial database quality control. Currently, there is no unified and reasonable method to represent refined line/region and line/line topological relations in two-dimensional (2D) space. In addition, the existing independent line/region and line/line models have some drawbacks such as incomplete type discrimination and too many topological invariants. In this paper, a refined line/region and line/line topological relations are represented uniformly by the sequence, dimension, and topological type of the intersection components. To make the relevant definitions conform to the traditional cognitions in 2D Euclidean space, the (simple) spatial object is defined based on manifold topology, and the spatial intersection components are defined based on the whole-whole object intersection set. Then the topological invariant of node degree is introduced, and the adjacent point kinds (e.g., “Null”, “On”, “In”, and “Out”) are defined to distinguish the intersection component types. Excluding impossible and symmetrical types, 29 types of intersection-lines (including 21 between lines/regions and 8 between lines/lines), and 6 types of intersection-points (including 2 between lines/regions and 4 between lines/lines) are classified. On this basis, a node degree-based whole-whole object intersection sets (N-WWIS) model for refined line/region and line/line topological relations is presented, and it can be combined with the Euler number-based whole object intersection and difference (E-WID) model (coarse level) to form a hierarchical representation method of topological relations. Furthermore, a prototype system based on the N-WWIS model for automatic topological integrity checking is developed and some evaluation experiments are conducted with OpenStreetMap (OSM) data is presented based on the classification of intersection components. The experimental results show that the N-WWIS model will enable the geographic information systems (GIS) community to develop automated topological conflict checking and dealing tools for spatial data updates and quality control.

scholarly journals Creation (updating) digital topographic maps for the forming the main state topographic map

2021 ◽  
Vol 41 (I) ◽  
pp. 113-122
Author(s):  
N. LAZORENKO-HEVEL ◽  
◽  
Yu. KARPINKYI ◽  
D. KIN ◽  
◽  
...  
Keyword(s):  
Quality Control ◽  
Spatial Data ◽  
Knowledge Bases ◽  
International Standards ◽  
Topographic Maps ◽  
Practical Significance ◽  
Topographic Map ◽  
Topological Relations ◽  
The Creation ◽  
Automated Quality Control

Purpose. The purpose of the article is to research the peculiarities of creation (updating) of digital topographic maps at the scale of 1:50 000/1:10 000 which would satisfy the requirements for the development of the seamless Topographic Database of the Main State Topographic Map at the scale of 1:50 000. Methodology. The basis for the research is the analysis of the possibilities of applying the theory of databases and knowledge bases, International Standards and specifications and vectorization method. Results. The article examines the peculiarities of creation (updating) digital topographic maps of the scale 1:50000 for the formation of the Main State Topographic Map of Ukraine for the purpose of the creation and maintain the seamless topographic database for national needs, which is located on the Geoportal to ensure the relevance of a single digital topographic basis by topographical monitoring of the territories and for the development of the National Spatial Data Infrastructure in Ukraine. The rules of topological relations between features of the digital topographic maps of the scale 1:50 000 are also defined and given. The peculiarities of providing automated quality control of updated digital topographic maps are investigated. The creation of the seamless Topographic Database of the Main State Topographic Map in the conditions of transfer the cartographic paradigm to geoinformation creates new requirements for the creation (updating) of digital topographic maps of the scale 1:50 000/10 000: creation of spatial schemes, description of the internal design of models and rules of digital description of geospatial features, unification of the features catalog and their attributes, as well as rules of topology between topographic features to ensure topological consistency of geometry in accordance with standards and specifications; creation of the “Validate” software package for checking of created (updated) digital topographic maps at a scale of 1:50 000/10 000 to ensure automated quality control of updated digital topographic maps; creation of new virtual and associated features in the TDB of the Main State Topographic Map. This will increase the intellectual level of geospatial data creation. Scientific novelty and practical significance. The creation of the Main Topographic Map Topographic Database takes into account the use of new virtual and associated features, the use of rules of topological relations between digital topographic map features, providing automated quality control of updated digital topographic maps.

Distributed Data Warehouse for Geo-spatial Services

2003 ◽  
pp. 132-145 ◽  
Author(s):  
Iftikhar U. Sikder ◽  
Aryya Gangopadhyay
Keyword(s):  
Decision Making ◽  
Data Warehouse ◽  
Spatial Data ◽  
System Integration ◽  
Prototype System ◽  
Distributed Data ◽  
Distributed Environment ◽  
Spatial Decision Making ◽  
Spatial Data Warehouse ◽  
Access To Data

This chapter introduces the research issues on spatial decision-making in the context of distributed geo-spatial data warehouse. Spatial decision-making in a distributed environment involves access to data and models from heterogeneous sources and composing disparate services into a meaningful integration. The chapter reviews system integration and interoperability issues of spatial data and models in a distributed computing environment. We present a prototype system to illustrate the collaborative access to data and as a model for supporting spatial decision-making.

scholarly journals Graph-Based Spatial Data Processing and Analysis for More Efficient Road Lighting Design

2018 ◽  
Vol 10 (11) ◽  
pp. 3850 ◽  
Author(s):  
Sebastian Ernst ◽  
Marek Łabuz ◽  
Kamila Środa ◽  
Leszek Kotulski
Keyword(s):  
Spatial Data ◽  
Traditional Approach ◽  
Lighting Design ◽  
Prototype System ◽  
Real World Data ◽  
Fine Grained ◽  
Road Lighting ◽  
Calculation Software ◽  
Spatial Data Processing

The efficiency and affordability of modern street lighting equipment are improving quickly, but systems used to manage and design lighting installations seem to lag behind. One of their problems is the lack of consistent methods to integrate all relevant data. Tools used to manage lighting infrastructure are not aware of the geographic characteristics of the lit areas, and photometric calculation software requires a lot of manual editing by the designer, who needs to assess the characteristics of roads, define the segments, and assign the lighting classes according to standards. In this paper, we propose a graph-based method to integrate geospatial data from various sources to support the process of data preparation for photometric calculations. The method uses graph transformations to define segments and assign lighting classes. A prototype system was developed to conduct experiments using real-world data. The proposed approach is compared to results obtained by professional designers in a case study; the method was also applied to several European cities to assess its efficiency. The obtained results are much more fine-grained than those yielded by the traditional approach; as a result, the lighting is more adequate, especially when used in conjunction with automated optimisation tools.

scholarly journals Large geospatial images discovery: metadata model and technological framework

2015 ◽  
Vol 14 (2) ◽  
pp. 21-36 ◽  
Author(s):  
Lukáš Brůha
Keyword(s):  
Spatial Data ◽  
Prototype System ◽  
Raster Data ◽  
Historical Collections ◽  
Metadata Model ◽  
Data Infrastructures ◽  
Spatial Data Infrastructures ◽  
Early Maps

The advancements in geospatial web technology triggered efforts for disclosure of valuable resources of historical collections. This paper focuses on the role of spatial data infrastructures (SDI) in such efforts. The work describes the interplay between SDI technologies and potential use cases in libraries such as cartographic heritage. The metadata model is introduced to link up the sources from these two distinct fields. To enhance the data search capabilities, the work focuses on the representation of the content-based metadata of raster images, which is the crucial prerequisite to target the search in a more effective way. The architecture of the prototype system for automatic raster data processing, storage, analysis and distribution is introduced. The architecture responds to the characteristics of input datasets, namely to the continuous flow of very large raster data and related metadata. Proposed solutions are illustrated on the case study of cartometric analysis of digitised early maps and related metadata encoding.

scholarly journals Spatiotemporal Information Organization and Visualization on Tidal Level

2015 ◽  
Vol II-4/W2 ◽  
pp. 81-85
Author(s):  
B. Huang ◽  
Y. Zhang ◽  
Y. Wang ◽  
Q. Liu
Keyword(s):  
Early Warning ◽  
Technical Support ◽  
Information Organization ◽  
Prototype System ◽  
Tidal Level ◽  
Shandong Peninsula ◽  
Historical Information ◽  
Spatiotemporal Characteristics ◽  
Spatiotemporal Information ◽  
Representation Method

The amount and location of oceanographic stations vary in different time and the observation information of the same station shows temporality. Hence, ocean observation information has strong spatiotemporal characteristics. This article firstly introduces storage strategy and representation method of spatiotemporal information on tidal level. Then the prototype system was built with the ability of storing, updating, analyzing, and early warning of tidal level in Shandong Peninsula of China. The system achieves the inquiry and visualization of realtime and historical information of oceanographic stations, which provides technical support for oceanographers and decisionmakers.

scholarly journals AGENT- AND CLOUD-SUPPORTED GEOSPATIAL SERVICE AGGREGATION FOR FLOOD RESPONSE

2015 ◽  
Vol II-4/W2 ◽  
pp. 13-18 ◽  
Author(s):  
X. Tan ◽  
L. Di ◽  
M. Deng ◽  
A. Chen ◽  
Z. Sun ◽  
...  
Keyword(s):  
Spatial Data ◽  
Service Oriented Architecture ◽  
Data Transfer ◽  
Geospatial Data ◽  
Prototype System ◽  
Service Oriented ◽  
Service Aggregation ◽  
Flood Response ◽  
Low Efficiency ◽  
The Impact

Flooding caused serious losses in China in the past two decades; therefore, responding to and mitigating the impact of flooding is a task of critical importance. The traditional flood response process is usually very time-consuming and labor-intensive. The Service-Oriented Architecture （SOA）-based flood response is a method with low efficiency due to the large volume of geospatial data transfer, and this method cannot meet the real-time requirement of a rapid response to flooding. This paper presents an Agent- and Cloud-supported geospatial service aggregation to obtain a more efficient geospatial service system for the response to flooding. The architecture of this method is designed and deployed on the Cloud environment, and the flooding response prototype system is built on the Amazon AWS Cloud to demonstrate that the proposed method can avoid transferring large volumes of geospatial data or Big Spatial Data. Consequently, this method is able to achieve better performance than that of the SOA-based method.

scholarly journals Synchronising Spatial Metadata Records and Interfaces to Improve the Usability of Metadata Systems

2021 ◽  
Vol 10 (6) ◽  
pp. 393
Author(s):  
Mohsen Kalantari ◽  
Syahrudin Syahrudin ◽  
Abbas Rajabifard ◽  
Hannah Hubbard
Keyword(s):  
User Interfaces ◽  
Spatial Data ◽  
End Users ◽  
Prototype System ◽  
Structured Interviews ◽  
Data Infrastructure ◽  
Level Of Satisfaction ◽  
Efficiency And Effectiveness ◽  
Development Approach ◽  
User Friendly

The spatial data infrastructure literature reveals significant gaps in metadata systems concerning their efficiency and effectiveness for end-users. The literature proposes improvements to make the metadata systems more user-friendly. These improvements include new metadata elements and user interfaces that are in concert with each other. In this paper, we implement the proposed improvements in a prototype system and engage with end-users to assess if the proposals help users’ expectations. The prototype is evaluated by conducting think-aloud protocol (TAP) usability testing and semi-structured interviews with end-users. The result demonstrates an increased level of satisfaction about existing systems and some more areas to improve. We conclude that a synchronised development approach for the spatial metadata and the user interface will increase the usability of the metadata for data discovery and selection.

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