论文部分内容阅读
在澳大利亚昆士兰州的Ravenswood地区,已经用地质扫描公司的机载多波段扫描仪(MKI)进行过岩性填图。由于地面的标定目标物具有不均匀性,因而,不能用将DN值与地面反射率值联系起来的线性回归法。相反,对数剩余值法(Green及Craig,1985)在将三个SWIR波段的DN值转换为一组数值(这些数值的波段间模式与地面反射率值的相似)时取得了成功。通过对这三个SWIR波段的“标定”值的线性组合,计算出了“明矾石指数”和“方解石指数”,用位于VNIR波长区的3波段和4波段数据生成了“垂直植被指数”图像,三个SWIR波段的HSI彩色变换是另外一种直观表示波段内响应模式的技术。用上述的技术都成功地圈出了区内的花岗闪长岩体中的绿帘石带和绢云母带。
In the Ravenswood area of Queensland, Australia, lithologic mapping has been performed using Geological Scanning’s airborne multi-band scanner (MKI). Because of the inhomogeneity of calibration targets on the ground, linear regression can not be used to relate DN values to ground reflectance values. In contrast, the log-remainder method (Green and Craig, 1985) succeeded in converting the DN values of the three SWIR bands to a set of values (the inter-band modes of these values are similar to the terrestrial reflectivity values). The “alum stone index” and the “calcite index” were calculated by linear combination of the “calibrated” values for the three SWIR bands and the “vertical vegetation index” images were generated using the 3-band and 4-band data located in the VNIR wavelength region , The HSI color transform of the three SWIR bands is another technique that visually represents the response mode in the band. Using the above techniques, the epidote and sericite belts in the granodiorite bodies in the area have been successfully circled.