提醒，可提前备份被添加多个影像的影像文件
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.