Abstract
Based on the measurements with HHRR (Hand Held Rationing Radiometer) which has a similar spectral responsivity to that of Landsat Thematic Mapper, characteristics of spectral reflectivity of several non-metallic ores and altered rocks collected in Yangsan-Dong Rae Faults in South Korea are made. The collection includes pyrophyllite ores, andesites, silicified sedimentary rocks, granite and granodiorite. The analyses of the measured data indicate following features.
1) Among the samples pyrophyllite ore has the highest reflectance in the spectral range corresponding to Landsat TM Band-1 through 5. The reflectance of pyrophyllite ore depends on quality with higher reflectance for higher quality.
2) The altered rock has higher reflectance than the unaltered rock.
3) Sharp drop of reflectance at 2.22 pm region corresponding to Band-7 of Landsat TM is observed for pyrophyllite which is considered due to the effect of OH. All the samples show low reflectance at Band-4 which is considered due to the effect of oxidization.
4) The band ratio of Band-7/Band-5 and Band-7/Band-4 are effective to discriminate pyrophyllite from other rocks.
