Remodelling Geographic Data to Facilitate the Interrogation by Sketch

The available amount of geographic datasets has considerably grown. This is due to the increasing number of different devices used in collecting such data. Moreover, the amazing progress of the web that allows sharing and accessing to any type of information has further increased this availability. However, query evaluation in spatial data is often expensive, because these data have complex structures and they are available in different formats and scales. Recently, systems have been developed to allow users to sketch what they are looking for instead of translating their requests into verbal query statements. These systems try to close the gap between user and spatial data, so the user can focus on his query rather than spending his time formulating the request. With an intention to make this process easy, the spatial data, in the database, must be reformulated to answer this new type of request. This paper presents a method for remodelling the spatial data in database in order to establish a retrieval information system by sketching.