Rapid Mapping with Post-Processed Data from Garmin Handheld Receivers

Terry Moore, Chris J. Hill and Michael E. Napier

Abstract:	GRINGO (GPS RINEX Generator) is a program which has been developed at the Institute of Engineering Surveying and Space Geodesy (IESSG) at the University of Nottingham, to record the pseudorange and full carrier phase data from 12-channel Garmin handheld GPS receivers, in standard RINEX (Receiver INdependent EXchange) format. It offers owners of these receivers the possibility of post-processing to an accuracy of approximately 5 m (with pseudoranges) or even a few centimetres (with carrier phase), without having to invest in separate DGPS receiving equipment or expensive survey-grade receivers. They retain the benefits of an inexpensive receiver with a user-friendly interface and powerful navigation features, but gain the possibility of improved accuracy if needed. This accuracy could be of use to all manner of navigation, mapping and GIS applications, where the accuracy achievable with stand- alone GPS is insufficient. In previous papers, the use of these cheap receivers for suveying to centimetric accuracy has been demonstrated. This paper summarises some typical results. This paper focuses on recent experiments in the area of rapid mapping. It describes an exercise that produced an orienteering map of a new site without recourse to a base map, and with only a couple of days of field work. In particular, the paper discusses the lessons learned from the exercise, and the subsequent work that has addressed some of the practical problems.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	1414 - 1422
Cite this article:	Moore, Terry, Hill, Chris J., Napier, Michael E., "Rapid Mapping with Post-Processed Data from Garmin Handheld Receivers," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 1414-1422.
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