Abstract
Chang'e-5 (CE-5) mission was successful to return samples up to 1.8 kg from the northeastern part of the Rumker region, the Moon. These samples can provide new understandings for the basaltic volcanism of northern Oceanus Procellarum. Therefore, the terrain-related analysis of the Rumker region will become a hotspot in the recent and latter studies. As a typical surface analyzing method, multiscale surface roughness has been used in planetary studies for a long time. However, fewer studies of topographic roughness analysis are applied in the Rumker region. The visual interpretations directly from digital elevation models (DEMs) or images potentially cause controversial results. To provide a way for reunderstanding the geomorphological features in Rumker region, we investigate a new roughness analyzing method to extract the topographic signatures by using a wavelet-based V-system of degree 1. Based on these signatures, the hectometer- and kilometer-scale roughness are calculated and mapped. The multiscale roughness textural changes are applied to provide new understandings of the geomorphological features of Rumker region. Our results demonstrate that: 1) Most of younger mare units show lower roughness textures following with the scale increases. Especially at kilometer scales, a new understanding is given to units Im1 and Em1 based on the statistical variations of the geologic units; 2) compared with the results obtained from the optical data, roughness maps provide a new way to recognize the wrinkle ridges in the Rumker region. The wrinkle ridges are reevaluated based on the hectometer- and kilometer-scale roughness textural changes.
Highlights
CHANG’E-5 (CE-5) mission, which was launched on 25, November, 2020, was successful to soft landing and return samples from the northeastern part of the Rümker region (51.8°W, 43.1°N)
We propose the multi-scale roughness algorithm to provide clear textural observations for re-understanding the geomorphological features in the Rümker region
Different from our previous study, we use the frequency components with dc component [29, 30] in the roughness parameterization, because we found that the dc component showed much fewer disturbances in the roughness calculation based on the high-resolution SLDEMs (128 and 512 pixels/°)
Summary
CHANG’E-5 (CE-5) mission, which was launched on 25, November, 2020, was successful to soft landing and return samples from the northeastern part of the Rümker region (51.8°W, 43.1°N). The lunar samples up to 1.8 kg were collected from the surface and subsurface, which were up to 2 m in depth [1]. These samples will provide new evidence to understand the geological features of northern Oceanus Prcellarum. The Rümker region (41−45°N, 49−69°W) will become a hotspot in the recent and latter studies. The Rümker region [Fig.1(a)] showed prominent topographic complex caused by volcanic activities [2]. The most abundant distantly sourced particles in this region were mainly ejecta from the craters Pythagoras
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