'making visible' in real time. This results in visualisation for presentation and exploration.Presentation fits into the traditional realm of cartography, where the cartographer works onknown geospatial data and creates communicative maps. These maps are often created formultiple uses. Exploration, however, often involves a discipline expert creating maps whiledealing with unknown data. These maps are generally for a single purpose, expedient in theexpert's attempt to solve a problem. While dealing with the data, the expert should be able torely on cartographic expertise, provided by the software or some other means.In the past cartography played an important role in the exploration of the world. Mapswere used to chart unknown territories. A new phase in mapping the unknown has recentlystarted. This does not refer to the cartographic or geographic exploration discussed in theprevious paragraph. It deals with the mapping of cyberspace.
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Celestial coordinate system,great circle,base line