And the methods in pre-processing are still hard and inefficient, in which GCP (Ground Control Points) marking is a key step and bottleneck.

• 其中,控制点采集是卫星影像矫正中的关键步骤和瓶颈因素,如何从无到有、从少量控制点快速高效获取大量控制点一直是研究的重点和挑战性工作。