This paper presents the exact error analysis of point positioning equation for airborne three-dimensional (3D) imaging sensor considering all the major potential error sources. With differential calculus and principles of precision analysis a mathematics formula on the point position error and relative factors is derived to show how each error source affects both vertical and horizontal positioning accuracy. A comprehensive analysis of the related error sources and their achievable accuracy are provided. At last, two example figures are shown to compare the position accuracy of elliptical trace scan and the line trace scan under the same error source and some corresponding conclusions are drown.
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