| Autor: |
S. Niyondezo, M. Odinga, R. L. Bedell, P. Trefois, L. Nkurikiye, Max Fernandez-Alonso |
| Rok vydání: |
1990 |
| Předmět: |
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| Zdroj: |
Remote sensing: an operational technology for the mining and petroleum industries ISBN: 9789401097468 |
| DOI: |
10.1007/978-94-010-9744-4_19 |
| Popis: |
Gold-bearing quartz veins hosted by quartzites in NE Burundi belong to a thrusted turbidite sequence in the external zone of the Kibaran Belt. Remote sensing data combined with computerized field investigations are the basis of exploration methodology. Analogue Thematic Mapper band 4 imagery were used in the initial stages of the project to test the relative capability of the data in this heavily vegetated terrain. Subsequent processing of digital TM data resulted in one main colour product written to film (TM bands 3, 4, 5 B, G, R with decorrelation stretch and 31×31 high pass filter applied to all bands). Regional interpretation at approximately 1:150, 000 scale provides quality data on the distribution of major thrust faults and more recent faulting associated with splays of the East African Rift System. Local interpretation on TM imagery enlarged to approximately 1:25, 000 scale provide additional and complimentary information as well as a mosaic base to stereo monochrome airphotos at 1:50, 000 scale. Airphotos are enlarged up to approximately 1:12, 000 scale for local mapping. Regional and local remote sensing products are integrated with airborne geophysical surveys and stream sediment geochemical surveys provided by aid projects in the past. All data are correlated with local prospect development to provide a basis for further detailed exploration in a given area. All data are vector digitized and converted into standard CAD format (DXF) for use on PC’s in Burundi. Data at different scales and projections are warped to TM imagery and airphotos for inspection as rectified overlays using comprehensive “rubber sheeting” techniques on the PC. Ultimately all data are rectified to UTM projections and tied in with ground surveys. Field data are typed into inexpensive laptops in the field and then read into a comprehensive database integrated with the digital maps on a PC. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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