PRELIMINARY STUDY ON SPACE-BORNE LASER ALTIMETER SUPPORTED AEROTRIANGULATION

摘要

As a way of acquiring elevation with high accuracy and effectiveness, space-borne laser altimeter improves the 3-dimensional earth observation capability of satellite optical remote sensing imagery. And using high accuracy elevation observation of space-borne laser altimeter as control points accords with the trend of satellite photogrammetry without ground control points. The problems of satellite photogrammetry is firstly introduced, then the methods of space-borne laser altimeter supported aerotriangulation is described in this paper, which can solve these problems due to the characteristics of laser altimeter. The bundle adjustment error equations are established according to the earth observation of satellite image and space-borne laser altimeter, as well as the relationship of their exterior orientation elements. Elevation observations supplied by laser altimeter can be used as elevation control point to improve the accuracy of aerotriangulation, and the positioning accuracy is analyzed.