Geo Visualization

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After a Named Entity Recognizer was applied to a text, a succeeding application could be a geographical visualization of the named entities of type location. Such a tool enriches the locations found in a text with geographic information, especially in the form of longitude and latitude. In a next step, the geographic visualizer can compile a visualization of the geographic locations in a data format that can be used by Geographic Information Systems (GIS, for example Google Maps or OpenStreetMaps) to render a map. For a geographic visualization, a database that combines the names of locations with their geographical coordinates is necessary. Such databases are available as web services on the net, for example Other organizations are offering this kind of data to be downloaded as a database dump. Depending on the available data and the actually used GIS, the geographic locations in a text can be marked as points on the map (for example, cities). In a more sophisticated approach, whole areas can be visualized, for example countries like "Germany" or regions like the "Middle East". A geographic visualizer has to deal with the problem of ambiguity: even in Germany there are already two different cities named "Frankfurt", where around the world you can find many more locations with that name.

An example for a Geo Visualization, done in WebLicht:

Sc geo.png