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The Alexandria Digital Library (ADL) is one of the six digital library projects funded by NSF, DARPA, and NASA. ADL's collection and services focus on information containing georeferences: maps, images, data sets, text, and other information sources with links to geographic locations. During this study period, three different user interfaces were developed(More)
All types of information can be referenced to a geographic place. Maps, aerial photographs, and remote sensing images are spatially georeferenced. Other forms of information such as books, articles, research papers, pieces of music, and art are often linked to a geographic location through place names (geographic names). A gazetteer (a dictionary of(More)
Digital gazetteers provide information on named features, linking the feature's name with its location and its type. They have been growing in importance recently as the basis of a range of services, including wayfinding, georeferencing, and intelligence. This introduction to the following collection of five research papers expands on contemporary
Since 1994, the Alexandria Digital Library Project has developed three prototype digital libraries for georeferenced information. This paper describes the most recent of these efforts, a three-tier client-server architecture that relies heavily on a middleware layer to present a single uniform set of interfaces to multiple heterogeneous servers. These(More)
Digital libraries serving multimedia information that may be accessed in terms of geographic content and relationships are creating special challenges and opportunities for networked information systems. An especially challenging research issue concerning collections of georef-erenced information relates tO the development of techniques supporting(More)
The Internet and the World Wide Web offer a new solution to the problem of sharing scientific knowledge. Unlike traditional libraries based on print media, these new technologies facilitate the sharing of any information that can be expressed in a binary alphabet. Environmental models expressed as computer codes are instances of such information objects,(More)