Version Support for Engineering Database Systems
IEEE Transactions on Software Engineering
Toward a unified framework for version modeling in engineering databases
ACM Computing Surveys (CSUR)
On finding minimum routes in a network with turn penalties
Communications of the ACM
A road network embedding technique for k-nearest neighbor search in moving object databases
Proceedings of the 10th ACM international symposium on Advances in geographic information systems
Modeling Costs of Turns in Route Planning
Geoinformatica
Versioning and configuration management in an object-oriented data model
The VLDB Journal — The International Journal on Very Large Data Bases
CCAM: A Connectivity-Clustered Access Method for Networks and Network Computations
IEEE Transactions on Knowledge and Data Engineering
Computational data modeling for network-constrained moving objects
GIS '03 Proceedings of the 11th ACM international symposium on Advances in geographic information systems
An efficient and scalable approach to CNN queries in a road network
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Query processing in spatial network databases
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Integrated data management for mobile services in the real world
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Maintaining Connectivity in Dynamic Multimodal Network Models
ICDE '08 Proceedings of the 2008 IEEE 24th International Conference on Data Engineering
Versioning of Network Models in a Multiuser Environment
SSTD '09 Proceedings of the 11th International Symposium on Advances in Spatial and Temporal Databases
Query Processing Using Distance Oracles for Spatial Networks
IEEE Transactions on Knowledge and Data Engineering
High performance multimodal networks
SSTD'05 Proceedings of the 9th international conference on Advances in Spatial and Temporal Databases
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Network data models are frequently used as a mechanism to describe the connectivity between spatial features in GIS applications. Real-life network models are dynamic in nature since spatial features can be periodically modified to reflect changes in the real world objects that they model. Such updates may change the connectivity relations with the other features in the model. In order to perform analysis the connectivity must be reestablished. Existing editing frameworks are not suitable for a dynamic environment, since they require network connectivity to be reconstructed from scratch. Another requirement for GIS network models is to provide support for a multiuser environment, where users are simultaneously creating and updating large amounts of geographic information. The system must support edit sessions that typically span a number of days or weeks, the facility to undo or redo changes made to the data, and the ability to develop models and alternative application designs without affecting the published database. The row-locking mechanisms adopted by many DBMSs is prohibitively restrictive for many common workflows. To deal with long-lasting transactions, a solution based on versioning is thus preferrable. In this paper we provide a unified solution to the problems of dynamic editing and versioning of network models. We first propose an efficient algorithm that incrementally maintains connectivity within a dynamic network. Our solution is based on the notion of dirty areas and dirty objects (i.e., regions or elements containing edits that have not been reflected in the network connectivity index). The dirty areas and objects are identified and marked during the editing of the network feature data; they are then subsequently cleaned and connectivity is re-built. Furthermore, for improving performance, we propose a `hyperedge' extension to the basic network model. A hyperedge drastically decreases the number of edge elements accessed during solve time on large networks; this in turn leads to faster solve operations. We show how our connectivity maintenance algorithms can support the hyperedge enhanced model. We then propose a new network model versioning scheme that utilizes the dirty areas/objects of the connectivity rebuild algorithm. Our scheme uses flexible reconciling rules that allow the definition of a resolving mechanism between conflicting edits according to user needs. Moreover, the utilization of dirty areas/objects minimizes the overhead of tracking the editing history. The unified editing and versioning solution has been implemented and tested within ESRI's ArcGIS system.