Personnel in the Corps of Engineers are authorized users of Precise Positioning Service (PPS) GPS. The Precise Lightweight GPS Receiver (PLGR) is the Army's authorized GPS receiver (Corps of Engineers personnel can obtain this). The U.S. Army Engineer School requested TEC evaluate the positional accuracies attainable with the PLGR. The evaluation covered four areas: real- time absolute, real-time differential, 'post-processed' absolute, and 'post- processed' differential. This paper discusses the techniques used and the accuracies observed. Capabilities, as well as limitations, of the current PLGR will also be discussed. Precise Positioning Service (PPS), PLGR, Evaluation, Accuracies.

This international symposium on theory and techniques for assessing the accuracy of spatial data and spatial analyses included more than ninety presentations by representatives from government, academic, and private institutions in over twenty countries throughout the world. To encourage interactions across disciplines, presentations in the general subject areas of spatial statistics, geographic information systems, remote sensing, and multidisciplinary approaches were intermixed throughout the three days of sessions.