Abstract
Abstract. Chang’e-4 (CE-4) has successfully soft landed in Von Kármán crater inside the South Pole-Aitken (SPA) basin at 10:26 am on January 3, 2019. High precision landing site mapping plays an essential role in mission operations and science applications before and after landing. In this paper, we propose a novel method for generating the highest resolution and the best precision Digital Terrain Model (DTM) and Digital Orthophoto Map (DOM) of the CE-4 landing area using available multi-source data. First, the CE-2 DTM is co-registered to SLDEM2015. Then the vertical inconsistencies of the co-registered DTMs are analysed and the biases of CE-2 DTM with respect to SLDEM2015 are erased. Finally, a new DTM with more information and better precision is generated by fusion of the co-registered DTMs. Using the new DTM as a reference, a seamless DOM is generated based on block adjustment of projected imagery, which can reduce the inconsistencies among the corrected images to sub-pixel level. As a result, a DTM of the Von Kármán crater area ( 42º S–48° S/172º E–180° E) and a seamless DOM covering an area of 2.3° in longitude and 1° in latitude with a ground sample distance of 0.9 m are generated using the developed method.
Highlights
Chang’e-4 (CE-4) has successfully soft landed in Von Kármán crater inside the South Pole-Aitken (SPA) basin at 10:26 am on January 3, 2019
These maps are useful for analysis of the landing area, but may not be sufficient for detailed analysis and mission planning for their low resolutions.We are committed to producing the highest resolution and the best precision Digital Terrain Model (DTM) and Digital Orthophoto Map (DOM) of the CE-4 landing area using available multi-source data
The two shaded relief maps have similar surface features which make it possible to match the DTMs through two-dimension feature match method (e.g. Scale-Invariant Feature Transform (SIFT))
Summary
Chang’e-4 (CE-4) has successfully soft landed in Von Kármán crater inside the South Pole-Aitken (SPA) basin at 10:26 am on January 3, 2019. SLDEM2015, a lunar DEM generated by co-registration and combining SELENE TC DEM with LRO laser altimetry data (Barker et al, 2016), and Chang’e-2 (CE-2) stereo images DTM (Li et al, 2018) are ~42 m/pixel and 20 m/pixel respectively at CE-4 landing site. These maps are useful for analysis of the landing area, but may not be sufficient for detailed analysis and mission planning for their low resolutions.We are committed to producing the highest resolution and the best precision Digital Terrain Model (DTM) and Digital Orthophoto Map (DOM) of the CE-4 landing area using available multi-source data
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