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Full-Text Articles in Physical Sciences and Mathematics
Digital Image Similarity For Geo-Spatial Knowledge Management, James Carswell
Digital Image Similarity For Geo-Spatial Knowledge Management, James Carswell
Conference papers
The amount and availability of high-quality geo-spatial image data, such as digital satellite and aerial photographs, is increasing dramatically. Task-based management of such visual information and associated knowledge is a central concern for organisations that rely on digital imagery. We are developing geo-spatial knowledge management techniques that employ case-based reasoning as the core methodology. In order to provide effective retrieval of task-based experiences that center around geo-spatial imagery, we need to forward novel similarity metrics for directly comparing the image components of experience cases. Based on work in geo-spatial image database retrieval, we are building an effective similarity metric for …
An Environment For Mobile Context-Based Hypermedia Retrieval, James Carswell
An Environment For Mobile Context-Based Hypermedia Retrieval, James Carswell
Conference papers
This paper proposes a novel solution to querying hyperlinked multimedia cultural heritage datasets based on the user's context. Context in this sense is defined as the user's location in virtual space and the particular mobile device being modeled together with user preferences or profile. The purpose is to automatically push relevant data from the database server to the client based on this comprehensive definition of the user's context. Consideration in regard to which mobile device is currently being modeled is a primary filter for determining what data will be sent and in what format. For example, image data will not …
Geospatial Data Handling For Web-Based And Mobile Applications, James Carswell
Geospatial Data Handling For Web-Based And Mobile Applications, James Carswell
Articles
One of the main bottlenecks for web-based GIS usability is in the transmission and handling of the vast amounts of geospatial data involved. The shear volume of raster, vector, attribute, and other data to be analysed, queried, transmitted and displayed over the WWW in real-time is prohibited by connection speeds. In this paper we introduce e-Spatial technology, a fully integrated open standard web-based solution to manage multiple spatial relationships directly in an Oracle Spatial database and to deploy in real-time spatially enabled (or standard) applications completely independent of data volume. Indeed, no application code is ever installed on the client …
Web-Based Spatial Information Management Systems, James Carswell
Web-Based Spatial Information Management Systems, James Carswell
Conference papers
In this paper we discuss the innovative software solutions offered by e-SpatialTM technology for the deployment of web-based and mobile spatial information management systems. This technology has been developed within the Oracle 9i Database environment and allows users to build and deploy spatially enabled Internet applications on any Oracle supported hardware platform and on any device running a Java Virtual Machine (e.g., standard web browsers, PDAs and other mobile devices). The paper focuses on a Land Information Management System (LIMS) application developed for the Irish Department of Agriculture. The application utilises the e-SpatialTM Information Server to deliver a spatially enabled …
Development Of A Real-Time Digital Acquisition Software System For The Ocean Optics S1000 Spectrometer, Stephen Fennell
Development Of A Real-Time Digital Acquisition Software System For The Ocean Optics S1000 Spectrometer, Stephen Fennell
Masters
The objective of the M. Phil degree project was to improve the digital acquisition speed of the existing Ocean Optic I/O S1000 spectrometer system. Research carried out prior to this research work indicated that the existing system, although allowing for successful spectroscopic measurements, did not provide for a true time-base required for time-resolved spectroscopy. The analogue/digital speed aspects of the I/O were investigated and shortcomings were found in the digital I/O of the system. These shortcomings were investigated and the existing Ocean Optics software was found to have a considerable role in the lack of overall acquisition speed. Various Ocean …
Scale And Orientation-Invariant Scene Similarity Metrics For Image Queries, James Carswell
Scale And Orientation-Invariant Scene Similarity Metrics For Image Queries, James Carswell
Articles
In this paper we extend our previous work on shape-based queries to support queries on configurations of image objects. Here we consider spatial reasoning, especially directional and metric object relationships. Existing models for spatial reasoning tend to rely on pre-identified cardinal directions and minimal scale variations, assumption that cannot be considered as given in our image applications, where orientations and scale may vary substantially, and are often unknown. Accordingly, we have developed the method of varying baselines to identify similarities in direction and distance relations. Our method allows us to evaluate directional similarities without a priori knowledge of cardinal directions, …