中文摘要：

连接点提取是ADS40影像数据自动空三的关键技术之一。为加快匹配速度并为高精度子像素匹配提供稳健而相对精确的初值，提出一种基于POS数据约束的ADS40影像SIFT（scale invariant feature transform）特征匹配方法。选取典型ADS40影像数据进行试验，并与传统灰度相关匹配方法及经典的SIFT算法相比，匹配正确率分别提高67．7％和11．99％。试验结果表明，文章提出的方法可提高ADS40影像匹配的成功率。由于匹配点能够均匀分布，因此文章方法能够为ADS40影像自动空三工作提供有效连接点。

英文摘要：

Tie point based on image matching is one of the key technologies of automatic aerial trian- gulation in processing ADS40 image data. To speed up image matching and provide a robust and relatively accurate initial value for high-precision sub-pixel matching, a SIFT feature match method constrained by POS data is proposed. A pair of typical ADS40 images is used to perform the proposed method. Compared with traditional cross-correlation and SIFT feature matching method, the number of matches increases 8.3 and 0.4 times respectively, while the accuracy rate improves by 67.7% and 11.99%. The results reveal that the matching success rate for ADS40 image could be increased by the proposed method. Because of the even distribution of matches, the proposed method is believed to be possible to provide valid tie points for automatic aerial triangulation of ADS40 images.