Kinematic Mapping with GPS in The Desert

Ahmed El-Mowafy

Abstract:	For years, traditional mapping in the Arabian Desert was a challenge primarily because of harsh weather conditions, which resulted in time consuming and very costly survey operations. Currently, GPS with its availability and accuracy can provide an efficient alternative to traditional methods. In this study, a kinematic GPS approach was tested in an open area in the desert. Both phase and code measurements were used to produce topographic maps of the test area. The role of phase and code positioning approaches is considered complementary for mapping purposes, where code measurements are most needed in remote areas. The tested area was previously mapped using intensive accurate traditional methods, which provide a good reference in assessment of GPS results. Code measurements used are post processed, employing precise orbits generated from two different sources, the NGS and the Canadian NRCan global precise orbits, in addition to precise clock correction from the later. Accuracy is enhanced by eliminating ionospheric errors using a dual frequency receiver. Code results were compared against phase results to check accuracy of the adopted code processing algorithm at this region of the world. When considering accuracy requirements according to the purpose of the maps needed, height accuracy less than one meter and horizontal accuracy at a decimeter level were acceptable. Test results show that with GPS, these accuracy were obtainable even in remote desert areas without ground control. Detailed comparison between the tested GPS approaches and the traditional methods, concerning time required and cost, clearly show the benefit of applying GPS for similar conditions.
Published in:	Proceedings of the 1999 National Technical Meeting of The Institute of Navigation January 25 - 27, 1999 Catamaran Resort Hotel San Diego, CA
Pages:	209 - 217
Cite this article:	El-Mowafy, Ahmed, "Kinematic Mapping with GPS in The Desert," Proceedings of the 1999 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1999, pp. 209-217.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In