ASTER Level 1T Precision Terrain Corrected Registered At-Sensor Radiance V004
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The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Level 1 Precision Terrain Corrected Registered At-Sensor Radiance (AST_L1T) data contains calibrated at-sensor radiance, which corresponds with the ASTER Level 1B (AST_L1B) that has been geometrically corrected and rotated to a north-up UTM projection. The AST_L1T is created from a single resampling of the corresponding ASTER L1A (AST_L1A) product. The bands available in the AST_L1T depend on the bands in the AST_L1A and can include up to three Visible and Near Infrared (VNIR) bands, six Shortwave Infrared (SWIR) bands, and five Thermal Infrared (TIR...
Terra卫星高级星载热发射和反射辐射计(Advanced Spaceborne Thermal Emission and Reflection Radiometer,ASTER)的1级精密地形校正注册传感器辐射亮度(AST_L1T)数据包含经过校准的传感器辐射亮度,该数据对应于已完成几何校正并旋转至北向上UTM投影(Universal Transverse Mercator projection)的ASTER 1B级(AST_L1B)数据。AST_L1T由对应ASTER 1A级(AST_L1A)产品经过一次重采样生成。
AST_L1T中可用的波段取决于AST_L1A中的波段,最多可包含3个可见光与近红外(Visible and Near Infrared,VNIR)波段、6个短波红外(Shortwave Infrared,SWIR)波段和5个热红外(Thermal Infrared,TIR)波段。AST_L1T数据集不包含后视VNIR波段3。AST_L1T产品的空间分辨率为:VNIR波段15米(m)、SWIR波段30米、TIR波段90米。
精密地形校正过程整合了GLS2000数字高程数据与派生的地面控制点(Ground Control Points,GCPs),以确保所有相关统计量达到最低阈值的日间场景具备地形精度。对于夜间获取的场景或地面图像质量降低的场景(如云层覆盖),可采用其他校正级别(系统地形校正、系统校正或精密校正)。
对于日间图像,若VNIR或SWIR望远镜采集了数据且尝试进行了精密校正,则每张精密地形校正图像都会附带一份独立的质量评估报告。该评估包含可供分发的几何校正信息,形式为文本文件和叠加有效GCPs的单波段浏览图像。
该多文件产品还包含带地理参考的全分辨率浏览图像。浏览图像的数量及图像的波段组合取决于对应AST_L1A数据集的可用波段。
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