The GPS coordinate system is analogous on a number of levels to the universal coordinate system embodied in the URL. With it, you can specify longitude, latitude, and height coordinates to within a metre (not counting any obfuscation performed by military satellites to fuzz things a bit) of any position on earth. With a properly synchronised timepiece, you also have a way of providing travel time and distance between coordinates, or of creating a historical trajectory. Graphical reference map applications
In a perfect world, the shortest distance between two points is a straight line. But in a shopping centre, for example, the shortest distance between two points is usually past the Starbucks, up the elevator, through the food court, and by the cinema. While the number of all possible routes is infinite, if you assume that a route's locus is defined as the centreline of the walkway, it's possible to create a handful of such routes (a three-dimensional network) that can be used to describe the shopping centre,. A decent shopping centre, map application would likely include some association between the symbolic and the visual map. Using a language such as the XML-based scalable vector graphics (SVG), it may be possible to create a graphical reference map with the position of map elements (doors, walls, escalators, entrances) rendered to the GPS coordinate system. Such an application would also group related elements (such as the general outlines of a shop, perhaps to a level including permanent shelves and counters) so that each such group could be identified as a shop, the toilets, a security station, and so forth. Consequently, a shopping centre map application could create a live "You are here" display.







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very interesting, also the W3 element; does anyone have further articles or information they could point in my direction that relate to this specific topic? thanks