提醒，可提前备份被添加多个影像的影像文件
Mosaic
ArcToolbox --> Data Management Tools --> Raster --> Raster Dataset --> Mosaic 如果不想要影像周围的“黑边”，选填 Ignore Background Value: the Ignore Background Value must be set to the same value as NoData (e.g., 0). NoData Value: same as above.
