Abstract
Abstract. A lunar global control network provides geodetic datum and control points for mapping of the lunar surface. The widely used Unified Lunar Control Network 2005 (ULCN2005) was built based on a combined photogrammetric solution of Clementine images acquired in 1994 and earlier photographic data. In this research, we propose an initiative for construction of a new-generation lunar global control network using multi-mission data newly acquired in the 21st century, which have much better resolution and precision than the old data acquired in the last century. The new control network will be based on a combined photogrammetric solution of an extended global image and laser altimetry network. The five lunar laser ranging retro-reflectors, which can be identified in LROC NAC images and have cm level 3D position accuracy, will be used as absolute control points in the least squares photogrammetric adjustment. Recently, a new radio total phase ranging method has been developed and used for high-precision positioning of Chang’e-3 lander; this shall offer a new absolute control point. Systematic methods and key techniques will be developed or enhanced, including rigorous and generic geometric modeling of orbital images, multi-scale feature extraction and matching among heterogeneous multi-mission remote sensing data, optimal selection of images at areas of multiple image coverages, and large-scale adjustment computation, etc. Based on the high-resolution new datasets and developed new techniques, the new generation of global control network is expected to have much higher accuracy and point density than the ULCN2005.
Highlights
As a realization of the lunar reference system, a lunar global control network (LGCN) provides geodetic datum and control points for mapping of the lunar surface, and it is of fundamental importance for both scientific and engineering applications
We propose an initiative for construction of a new generation LGCN using multi-mission data acquired in the 21st century
To ensure the fitted rational polynomial coefficients (RPCs) are sufficiently accurate, we will perform regional bundle adjustment to improve the accuracy of the exterior orientation (EO) parameters of the participating images
Summary
As a realization of the lunar reference system, a lunar global control network (LGCN) provides geodetic datum and control points for mapping of the lunar surface, and it is of fundamental importance for both scientific and engineering applications. The five lunar laser ranging retro-reflectors (LRRRs), which have cm level 3D position accuracy, can be identified in high resolution images, such as Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) images (Wagner et al, 2012; Liu et al, 2015a). These LRRRs can serve as absolute control points in construction of the new LGCN. The data to be used, technical framework and key techniques will be elaborated and discussed
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