Spatial data and mobile applications - general solutions for interface design

Nowadays, spatial data are totally widespread in mobile applications. They are present in games, map applications, web community applications and office automations. However this kind of spatial information potentially needs a large display area and the hardware constraint related to the limited screen dimensions creates many usability challenges. Our investigation in the last few years to find solutions to these challenges has led us to the discovery of general usability principles that a well-designed interface should adopt. In this paper we describe the mental path we have followed to derive those principles from the experience gained in developing mobile interfaces for different application domains. The principles are formalized in terms of two interaction design patterns, specific for mobile interfaces managing spatial data. They extend existing HCI patterns and are completed, as usual, with concrete examples of their applications