Abstract
High accuracy Digital Surface Models can be created quickly and efficiently using GPS survey techniques. However, survey grade GPS receivers are not renowned for their affordability. The positioning requirements of many GIS and environmental survey applications can be met with cheaper receivers, but many of the high-end requirements are not achievable unless two survey grade receivers are purchased. The advent of the National GPS network may provide a means of reducing the cost of hardware for users by the removing the requirement of two receivers. GPS data is processed using the Ordnance Survey stations as base stations for relative positioning. The results are used to create DSMs and a comparison of the outputs computed from three different stations is presented.
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