39352664
Multi-source Coastal Data Analysis
This paper presents results from the second year of a project on coastal management and decision making sponsored by the National Science Foundation Digital Government Program and carried out by a multidisciplinary research team. As one of the primary goals of the project, tide-coordinated shoreline modeling and mapping requires the integration of multi-source spatio-temporal data that include high-resolution digital elevation models (DEM) derived from IKONOS satellite images and aerial photographs, bathymetric data, water gauge data, satellite altimetric data, and water surfaces derived by a hydrodynamic hindcast model (Li et al., 2002b). Quality and accuracy assessment of these data has been made to ensure reliability of the outcomes of the data integration. The resulting shorelines derived from the integrated data are then evaluated for accuracy in comparison with traditional shorelines determined from tide-coordinated aerial surveys.
9514355
Integration of Multi-Source Spatial Information for Coastal Management and Decision Making
This paper presents the second-year outcomes of our Digital Government project "Digitalization of Coastal Management and Decision Making Supported by Multi-Dimensional Geospatial Information and Analysis". One of the primary objectives of the second year is to develop and integrate multiple spaceborne, airborne, and in-situ remotely sensed measurements, spatio-temporal databases, coastal hydrological modeling, and geospatial information analysis for coastal management and decision making. The developed coastal management and decision-making system includes applications for coastal mapping and change detection, water surface modeling and analysis, on-site coastal management and decision-making, and web-based spatial data manipulation. Studies have also been conducted on uncertainties in the used coastal spatial data. The above system has been tested at a pilot site along Ohio's Lake Erie shore and is to be applied to a new test site in Tampa Bay, Florida.
46225184
Spatial Technologies for Coastal Management
This demonstration will be presented at the 2004 National Conference on Digital Government Research. The third year results of the project "Digitalization of Coastal Management and Decision Making Supported by Multi-Dimensional Geospatial Information and Analysis" will be presented. Mobile wireless communications, internet web services, and web GIS are integrated into a web-based decision-making system for coastal management. Employing three-dimensional visualization technology, athe system also provides a visualization tool for multisource spatial-temporal data integration and uncertainty analysis. Also demonstrated is an interactive QuickBird image processing subsystem used for high resolution DEM and three-dimensional shoreline extraction of Tampa Bay.The goal of this project is to develop technologies to enhance the operational capabilities of federal, state, and local agencies responsible for coastal management and decision making. The pilot test site is along the Lake Erie coastline from Port Clinton to East Cleveland, Ohio. Research strategies are currently being applied to Painesville, OH and Tampa Bay, Florida. The demonstration will include the following sections.
14545344
Implementation of A Coastal Decision Making System Using Internet and Wireless Technologies
This paper presents results of a coastal decision making system that utilizes the following tools: Internet, wireless technology, and Geographic Information Systems (GIS). The developed system consists of an on-site mobile spatial subsystem, a coastal structure permitting subsystem, and a web-based shoreline erosion awareness subsystem. The system is being tested and developed for applications in the Lake Erie, Ohio and will be adapted to the Tampa Bay, Florida area.
2594812
Evaluation of the Geopositioning Accuracy of QuickBird Imagery
QuickBird satellite imagery, provided by DigitalGlobe Inc., has the highest resolution, among the satellite imaging systems that are commercially available. The QuickBird imaging system simultaneously collects 67-72 centimeter resolution stereo panchromatic and 2.44-2.88 meter resolution multispectral images. In this research, a QuickBird stereo pair of basic imagery product that was taken over Tampa Bay, FL, was acquired and its geopositioning accuracy evaluated based on Rational Function (RF) models.
34576037
A Spatio-Temporal Decision Making System for Coastal Change Monitoring and Coastal Management
This demonstration will be presented at the 2003 National Conference on Digital Government Research to accompany a short paper entitled "Integration of Multi-Source Spatial Information for Coastal Management and Decision Making". The demonstration presents the two-year outcomes of our Digital Government project "Digitalization of Coastal Management and Decision Making Supported by Multi-Dimensional Geospatial Information and Analysis" that aims to develop technologies to enhance operational capabilities of federal, state, and local agencies responsible for coastal management and decision making. The pilot test site is along the Lake Erie coastline from Port Clinton to East Cleveland, Ohio. Research strategies are currently being applied to a new test site in Tampa Bay, Florida. The demonstration includes the following sections.
13976225
WebPeer: A P2P-based system for publishing and discovering Web services
The use of Web services as an infrastructure of service sharing has made it possible to provide collaboration and interoperability in distributed computing environment. In this environment, service publishing and discovery are required as elementary functionalities for users to be able to locate the shared resources. The mechanism of service publishing and discovery with centralized architecture restricts the reliability and scalability of the distributed computing environment as the services and resources on the Web are fast emerging. The peer-to-peer (P2P) systems and applications, on the other hand, employ distributed resources to perform critical functions in a decentralized manner. This paper introduces Web Services Oriented Peer-to-peer (WSOP) architecture with a combination of centralized and decentralized characteristics, and presents a framework of service publishing and discovery model based on WSOP architecture. The prototype system - WebPeer implemented based on this model demonstrates the WSOP architecture can not only help to overcome the known obstacles in common Web Services infrastructure such as single node failure, but also extend the ability of the pure P2P systems, such as more efficiently locating the resources, increasing the interoperability between different P2P systems.
274260
Preserving operation effects relation in group editors
Consistency maintenance is a critical and challenging issue in many interactive groupware applications that can be modeled as group editors. This paper addresses two open consistency problems: divergence and operation effects relation violation. While the former has been partly solved, the latter has never been addressed in any published work. We propose a novel approach to solving both problems in the same framework. Particularly it preserves the effects relation of concurrent operations so that convergence is achieved automatically. Our work provides a new perspective into group editors and operational transformation algorithms.
6337639
Transparent sharing and interoperation of heterogeneous single-user applications
Multi-user applications generally lag behind in features or compatibility with single-user applications. As a result, users are often not motivated to abandon their favorite single-user applications for groupware features that are less frequently used. A well-accepted approach, collaboration transparency, is able to convert off-the-shelf single-user applications into groupware without modifying the source code. However, existing systems have been largely striving to develop generic application-sharing mechanisms and undesirably force users to share the same application in cooperative work. In this paper we analyze this problem and present a novel approach (called intelligent collaboration transparency) to addressing this problem. Our approach allows for heterogeneous application sharing by considering the particular semantics of the applications and the collaboration task in question.
9157971
Service Publishing and Discovering Model in a Web Services Oriented Peer-to-Peer System
To enhance the reliability and scalability of the service oriented architecture, this paper introduces a Web Services Oriented Peer-to-peer (WSOP) architecture with a combination of centralized and decentralized characteristics, and gives a framework of service publishing and discovery model based on WSOP architecture.
17885452
Commutativity-based concurrency control in groupware
Commutativity of operations is often exploited in concurrent systems to attain high levels of concurrency. A commutativity-based concurrency control method, called operational transformation (OT), has been actively researched in groupware over the past 15 years. However, much progress can still be made on more practicable approaches to developing and proving OT algorithms. Several constraints have been proposed previously but they are generally difficult to follow and verify in practice. This paper proposes an alternative approach to address this problem. A new consistency model is defined which greatly simplifies the design and proof of OT algorithms