广义控制点影像库构建与影像几何校正应用
Construction and Application for Image Ge-ometric Correction of Generalized GCP Chip Database

传统控制点影像数据库控制点特征单一，在卫星影像几何校正应用中容易出现在待校正影像上控制点不易分辨与定位情况，无法为地物光谱信息多样化卫星影像提供相适应的控制信息。本文提出广义控制点影像概念，并提出三层C/S模式的广义控制点影像库构建方法，包括广义控制点影像检索，最后完成多源卫星影像几何校正应用。以某城市为例，利用三种类型卫星影像数据进行可行性实验。实验结果表明：本文方法可以为多源卫星影像几何校正检索出准确的广义控制点影像数据，检索结果最邻近指数总体大于1，且校正精度可达1像素以内。本文方法可以实现特征更高级的控制信息的存储与检索，以及多源卫星影像高效统一式几何校正。
The GCP feature of traditional GCP chip database is single. It is difficult for geometric correction to distinguish and locate GCP and it is unable to provide appropriate control information for satellite images with diverse spectral information. This paper proposes the concept of generalized GCP chip, the construction method of GCP chip database system based on three-tier Client/Server mode and the retrieval method for generalized GCP chips, and finishes the geometric correction of mul-ti-source satellite images. Taking a city as an example, the feasibility test is carried out by using three types of satellite image data. The experimental results show that the proposed method can retrieve accurate generalized GCP chips. The nearest neighbor index of Retrieving result is greater than 1, and the correction accuracy is less than 1 pixel. The proposed method of this paper can real-ize the storage and retrieval of more advanced control information, and efficient unified geometric correction of multi-source satellite images.