Abstract
The positioning accuracy is critical for satellite-based topographic modeling in cases of exterior orientation parameters with high uncertainty and scarce ground control data. The integration of multi-sensor data can help to ensure precision topographical modeling in such situations. Presently, research on the combined processing of optical camera images and laser altimeter data has focused on planetary observations, especially on the Moon and Mars. This study presents an endeavor to establish a combined adjustment model with one constraint in image space for integration of ZY3-02 stereo images and laser altimeter data for improved Earth topographic modeling. The geometric models for stereo images and laser altimeter data were built first, and then, the laser ranging information was introduced to construct a combined adjustment model on the basis of the block adjustment model. One constraint that minimized the back-projection discrepancies in image space was incorporated into the combined adjustment. Datasets in several areas were collected as experimental data for the validation work. Experimental results demonstrated that the inconsistencies between stereo images and laser altimeter data for the ZY3-02 satellite can be reduced, and the elevation accuracy of stereo images can be significantly improved after applying the proposed combined adjustment. Experiments further proved that the improved height accuracy is insensitive to the number and relative position of laser altimeter points (LAPs) in stereo images. Moreover, additional plane control points (PCPs) were incorporated to achieve better planimetric accuracy. Experimental results in the Dengfeng area showed that the adjustment results derived by using LAPs and additional four PCPs were only slightly lower than those for the block adjustment with four ground control points (GCPs). Generally, the proposed approach can effectively improve the quality of Earth topographic model.
Highlights
Surveying and mapping play a very important role in various socioeconomic and national defense related construction projects
This paper presents an investigation into the integration of stereo imagery and laser altimeter data, which is achieved through combined adjustment with one constraint in image space so as to improve Earth topographic modeling
A combined adjustment model with one constrain in image space was proposed for integration of ZY3-02 stereo images and laser altimeter data for improved Earth topographic modeling
Summary
Surveying and mapping play a very important role in various socioeconomic and national defense related construction projects. The geometrical positioning accuracy of surveying and mapping satellite is mainly limited by the attitude performance of the satellite platform which affects the precision of orientation parameters [1]. The Songshan, Dengfeng, and Tianjing datasets consisted of only one standard scene and associated laser altimeter data, where each standard scene included NAD, BWD, and FWD stereo images. The Taihang dataset consisted of one strip of scenes (12 standard scenes) and one strip of laser altimeter data (orbit 944). This dataset crossed the Taihang Mountains and covered a total area of around 55 km × 550 km; the height range varied from 75 to 2,750 m. Because of the acquisition time interval between the stereo images and laser altimeter data was relatively short and the pointing angle between them was consistent, the error induced by the non-simultaneous acquisition could be neglected
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
