More and more private citizens collect and publish environmental data via web-based
geographic information systems. These systems face two challenges: The user interface …

Sketching is a natural and easy way for humans to express visual information in everyday
life. Despite a number of approaches to understand online sketch maps, the automatic …

Positioning and map technology integrated to smart mobile devices allows the users to
locate themselves and find routes between locations. Such route finding typically works only …

In many geo-spatial applications, freehand sketch maps are considered as an intuitive way
to collect user-generated spatial information. The task of automatically mapping information …

The SketchMapia aims at relaxing technical constraints on Geographic Information Systems
(GISs) by developing a framework taking freehand drawn sketch maps as input. This paper …

Over the past years, user-generated content has gained more prominence in the area of
geographic information science. In many geo-spatial applications, sketch maps are …

Sketch maps are an externalization of an individual's mental images of an environment. The
information represented in sketch maps is schematized, distorted, generalized, and thus …

Providing an adequate route description requires in-depth spatial knowledge of the route in
question. In this article we demonstrate that despite having travelled a route recently and …

During the last two decades, dozens of qualitative representations have been proposed.
These representations are motivated by a wide variety of applications of spatial data …

During the last two decades, dozens of qualitative representations have been proposed.
These representations are motivated by a wide variety of applications of spatial data …