Georeferencing for coordinated positioning applications

In situations of natural disasters or similar, people involved in civil protection operations need the highest degree of coordination. When resorting to digital means of coordination like positioning applications that rely on the Global Positioning System (GPS) to show users their position on digitalized cartography, users expect their position to be shown as accurately as possible. To achieve this, the images used as cartography must be associated with accurate geographical coordinates although sometimes that is not enough because the process of associating geographical information to an image, called georeferencing, has errors. The best way to minimize these errors is to increase the amount of geographical information, in the form of georeferencing points, associated with the used image. In this paper the amount of geographical information required for an image to be used as a reliable map in a coordinated positioning application is studied.