Department of Structural Engineering,
University of Cagliari
Email: [email protected]
Since past few years the Topography Section of the University of Cagliari, Italy has been working in the field of GPS-GIS systems in order to study their accuracy and functionality. In the present paper the author shows tests performed with a handheld GPS-GIS system and some of its applications
Many government agencies require, for their territorial management, instruments that provide real time updating on Geographic Information Systems (GIS). This fact has led research teams and software/hardware industries to implement integrated GPS-GIS systems in order to offer the possibility to survey in real-time elements present on the land together with information and attributes, allowing their direct representation within a GIS.
Such systems are based essentially by a GPS navigational sensor implemented with a palmtop computer supplied with software for visualizing GPS positioning (3D coordinates) directly on GIS map. The main advantages concerning the use of these systems are their user-friendliness, light weight and small size. These features allow single users, though not particularly expert, to perform surveying and GIS updating.
Presently in the market there are several integrated GPS-GIS systems which, depending on their accuracy and functions, provide GIS updating at different scales. The use of such systems, in appearance simple and immediate, really require a series of operations which, when not performed correctly, often put down the accuracy of results.
Since some years the Topography Section of the University of Cagliari has been engaged in the study of issues related to GPS-GIS systems.
The researchers have performed analyses and experiments by using different hardware and software solutions within a project concerning GPS permanent stations networks and dissemination via Internet of GPS differential corrections. In this paper the results of tests carried out with a handheld GPS-GIS system are presented.