Three-line Array Ccd Image Automatic Generation Of Dem Technology Research And Practice

The transmission satellite is the important direction of space photogrammetry. The Three-Line-Array CCD camera is one of the main sensor in transmission satellite. This paper focuses on the automatic DEM extraction using Three-Line-Array CCD image, centering on the method, accuracy, reliability of image matching and DEM edit, a thoroughly theoretical analysis and practices are made. Finally ,a workstation for photogrammetry has been established. The main works and contributions are summarized as follows:1. Combined the development of photogrammetry, the transmission satellite,especially Three-Line-Array CCD camera and the mapping of Three-Line-Array CCD image is introduced. Then the problems and reasons mapping of Three-Line-Array CCD image are indicated, and brought forward the methods for automatic DEM extraction.2. A new image matching method has been researched. The method for extraction DEM has been put forward, basing on object space and pre-orthoimage,combining PGA theory. And the Three-Line-Array CCD photogrammetry mapping system is established in the workstation.3 The method, which uses the multipoint least square or the multipoint rough matching and the parallax smoothness method in last layer of pyramid and correlative coefficient in other layers is put forward during the pyramid image matching. The strategy that used different matching methods in different layers obtain a good effect in practice.4 The DEM edit system for Three-Line-Array CCD image is designed and implemented in order to improve the accuracy of automatic DEM extraction. The wrong matching points and areas are edited under the stereo condition.5 Finally, based on the above theories and researchs, a complete experiment system has been established under the windows condition.