期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：Many terms are used to name and define these data operations: "fusion" and "integration" of geospatial data or "integration (or fusion) of digital images and geospatial information", as well as "revision (or updating) of geospatial (or topographic) information (or data bases). The present paper will try first to delimitate the use of these terms in the context of the research work done for the CIT-O (Centre for Topographic information – Ottawa, Natural Resources Canada). In an emergency situation the authorities in charge of mapping support will face two major challenges: 1) to deliver 'immediately' up-to-date existing topographical information showing the situation before the emergency occurs (position of existing roads, bridges, community facilities, strategic buildings, etc.); 2) to get as quick as possible digital images from the disaster area in order to understand and monitor the situation, to evaluate the damages and the risk for injuries or more damages and to support the rescue operations. To meet these challenges there is a need to deal with a range of heterogeneous geodata consisting for example of various sources, geometries, scales, resolutions, types, accuracies and dates. In an emergency mapping situation, the choice of data sources to be integrated / fused could be limited and the user can be forced to use data and images with a resolution outside the normal limits. The present work evaluates the fusion of images with a significant difference in spatial resolution in the typical framework of an emergency mapping project. It also investigates the fusion possibilities of the various data with respect to their enhancement of feature interpretation and extraction as well as the integration of imagery with existing topographic data. Relations and criteria are established for the evaluation of the fusion processes, while certain relations can be established between the resolution of the imagery and the scale of the original cartographic product.
