Abstract
Rapid data acquisition from a moving vehicle using positions given by the Global Positioning System (GPS) allows fast and reliable data collection for digital mapping and Geographic Information Systems (CIS). However, built-up city ‘urban canyons’ offer an environment which challenges the physical limitations of modern GPS positioning and, yet, is perhaps the one environment where the successful application of GPS technology could benefit most GIS users. With a view to the next generation of vehicle positioning system to be used for rapid data collection purposes, this paper highlights the limitations imposed on current GPS systems operating in the urban canyon. The capabilities of a future vehicle-based positioning system operating in this type of environment are discussed. Such a system would comprise receivers capable of integrating the Global Positioning System and the Russian equivalent, the Global Navigation Satellite System (GLONASS), and relatively cheap dead-reckoning sensors.
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