Integration of Remotely Sensed and Geophysical Data Sets in Engineering Site Characterization in a Basement Complex Area of Southwestern Nigeria

A Idornigie, A Idornigie, M Olorunfemi, A Omitogun
2006 Journal Applied Sciences Research   unpublished
A study of the efficacy of the integration of remote sensing and geophysical data sets, with geological/geomorphologic data serving as ancillary information, in engineering site characterization was carried out. The aim of the study was to demonstrate an innovative result-oriented approach to site characterization involving these methods. Landsat-7 ETM+ image data were processed and interpreted to generate the relevant data sets. The geophysical investigation involved the acquisition and
more » ... uisition and interpretation of vertical electrical soundings (VES) and magnetic total field data at 949 and 1050 locations, respectively. The resultsof the remote sensing and the geophysical surveys were then integrated in a GIS so that the regional and local geology, subsurface lithologic layering, slope magnitude/aspect, bedrock structural features, depth to bedrock, bedrock relief, aquifertypes/water resources, subsoil competence and soil corrosivity withinthe target site could be obtained. The study concludes that the natural (biophysical) environment can best be studied using inter-or multidisciplinary approaches. For this, a four-stage order of activities involving analysis of remotely sensed data; followup ground truthing of theremote sensing deductions; subsurface investigation using surface geophysical methods; andintegration of the resultsfrom the preceding three stages, has been found very helpful and it is therefore proposed.