Pixel-level Terrain Processing of the Martian Surface from Moderate Resolution Images of Tianwen-1

The moderate-resolution camera (MoRIC) of the Tianwen-1 orbiter, China’s first Mars exploration mission, is a frame-imaging scheme color camera. However, generating a precise digital elevation model (DEM) from these images faces challenges due to the presence of featureless and repetitive regions on...

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Bibliographic Details
Published in:The Astronomical journal 2024-11, Vol.168 (5), p.216
Main Authors: Liu, Dingxin, Yan, Wei, Liu, Jianjun, Zeng, Xingguo, Chen, Wangli, Ren, Xin
Format: Article
Language:English
Subjects:
Algorithms
Cameras
Correlation coefficient
Correlation coefficients
Data smoothing
Digital Elevation Models
Digital imaging
High resolution
Image enhancement
Image resolution
Mars
Mars exploration
Mars Express (ESA)
Mars surface
Photogrammetry
Pixels
Remote sensing
Search algorithms
Shading
Terrain
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Summary:The moderate-resolution camera (MoRIC) of the Tianwen-1 orbiter, China’s first Mars exploration mission, is a frame-imaging scheme color camera. However, generating a precise digital elevation model (DEM) from these images faces challenges due to the presence of featureless and repetitive regions on the Martian surface. Traditional photogrammetric methods often struggle to achieve pixel-level resolution in these areas. To address this, we employ a shape from shading (SFS) algorithm that leverages shading patterns to reconstruct fine-scale terrain details, optimizing photogrammetric initial DEM. This paper presents a novel global bisection search algorithm, based on the Pearson correlation coefficient to determine the smoothing parameter, a crucial element in the SFS process. Comparisons with higher-resolution data from the Mars Express high-resolution stereo camera and Mars Reconnaissance Orbiter CTX images validate our approach, highlighting the potential of SFS to significantly enhance the scientific value of Tianwen-1 MoRIC data by generating high-resolution, three-dimensional maps of Mars.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ad7eb4