A Semi Automated Technique to Regolith-Landform mapping in West Africa.

Thomas Woolrych; Steve Dr Batty

doi:10.1071/ASEG2007ab167

ISSN: 2202-0586
E-ISSN:

oa A Semi Automated Technique to Regolith-Landform mapping in West Africa.
Authors Thomas Woolrych^a and Steve Dr Batty^b
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^a FUGRO AIRBORNE SURVEYS PTY LTD, 65 Brockway Road Floreat, Perth Australia 6016, [email protected] ^b FUGRO AIRBORNE SURVEYS PTY LTD, 65 Brockway Road Floreat, Perth Australia 6016, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab167
- Published online: 01 Dec 2007

Abstract

Summary

Large regional airborne surveys have been flown over much of Nigeria, Niger and Ghana the data collected (mag spec and gamma radiometrics) in conjunction with Landsat ETM7+ and Shuttle Radar Topography Mission (SRTM) data sets are being used to create Regolith-Landform maps. Desktop GIS based techniques are being employed to automate the process as much as possible. Minimal field calibration of the mapping products is possible due to contract and time constraints.

The RT-map system (Pain et al 2000) developed at Geoscience Australia for Australian Regolith has been adapted for the purposes of this work. Mapping was completed at scales ranging from 1:50,000 to 1:250,000.

Automated mapping techniques will become increasingly viable as high resolution datasets become more available and computing and GIS improve.

The technique has been successfully used to map large portions of Niger and Nigeria for the respective government surveys.

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References

Anand, R. R., Phand, C., Smith, R. E. and Munday, T. J., 1993, The regolith and its exploration and economic significance, in Kalgoorlie ’93: An international conference on crustal evolution, metallogeny and exploration of the Eastern Goldfilelds, Excursion Guidebook: AGSO Record 1993/53, p. 75–100.
Dickson, B.L. and Scott, K.M., 1997, Interpretation of aerial gamma-ray surveys – adding the geochemical factors: AGSO Journal of Australian Geology and Geophysics, 17 (2), 187-200.
Hocking, R.M., Langford, R. L., Thorne, A. M., Sanders, A. J., Morris, P. A., Strong, C. A., Gozzard, J. R. and Riganti, A., 2005. A classification system for regolith in Western Australia – An update: Geological Survey of Western Australia, Department of Industry and Resources, Record 2005/10.
Minty, B.R., 1997, Fundamentals of airborne gamma-ray spectrometry: AGSO Journal of Australian Geology and Geophysics, 17 (2), 39-50.
Pain, C., Chan, R., Craig, M., Gibson, D., Ursem, P. and Wilford, J., 2000, RTMAP regolith database field book and users guide (second edition): CRC LEME Report 138.
Taylor, G and Eggleton, R, A, 2001, Regolith Geology and Geomorphology. Wiley, Chichester, 375p.
Taylor, G. and Butt, C.R.M., 1998, The Australian regolith and mineral exploration: AGSO Journal of Australian Geology and Geophysics, 17 (4), 55-67.
Wilford, J.R., Bierwirth, P.N. and Craig, M.A., 1997, Application of airborne gamma-ray spectrometry in soil/regolith mapping and applied geomorphology: AGSO Journal of Australian Geology and Geophysics, 17 (2), 201-216.

/content/journals/10.1071/ASEG2007ab167

Article Type: Research Article

Keyword(s): Airborne Surveys; GIS.; Radiometrics; Regolith-Landform; SRTM; West Africa

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