In low-altitude photogrammetry based on unpiloted airship, strip aerial triangulation is easy to be influenced by error in the course of image acquiring, data processing, feature extracting and matching. So that it causes error accumulation in building single air strip model and then has effects on subsequent adjustment. A three-step algorithm, which corrects the connection error of contiguous stereopair models in single air strip, is proposed. First step is to correct the error of projected baseline using GPS data. Second step is to connect models by relative orientation. Last step is to correct the error with linked points which should...