A comparative study on continuum removal for Chang’E-4 VNIS hyperspectral data and its impact on elements retrieval

Chao Wang; Xiangsui Zeng; Jia Li; Liyan Shang; Jiong Feng

doi:10.1117/12.2680038

27 June 2023 A comparative study on continuum removal for Chang’E-4 VNIS hyperspectral data and its impact on elements retrieval

Chao Wang, Xiangsui Zeng, Jia Li, Liyan Shang, Jiong Feng

Author Affiliations +

Proceedings Volume 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022); 127052Y (2023) https://doi.org/10.1117/12.2680038
Event: Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 2022, Nanjing, China

Abstract

Spectral absorption features are important parameters for lunar mineral identification and its abundance retrieval. The spectral absorption features of lunar regolith around 1000 nm (Band I) and 2000 nm (Band II) are significant weakened due to long-history space weathering. Continuum removal can effectively enhance the features of spectral absorption for lunar surface materials, which is particularly applicable for processing the in-situ hyperspectral data that obtained by the Visible and Near Infrared Spectrometer (VNIS) onboard Chang’E-4 Yutu-2 Rover that landed in Von Kármán crater. In this paper, three types of functions, i.e., linear, the second-order parabola polynomial and the piecewise polynomial functions, are used to fit the continuum of VNIS spectra, and further accessing their influences on calculating the parameters of spectral absorption features. The study shows that the piecewise polynomial continuum performs the best in enhancing the spectral absorption features of VNIS data in Bands I and II. Both endpoints of the continuum can be found. The derived absorption features, such as band depth and centers are highly consistent with those obtained with ENVI software, who uses the full convex hull to determine spectral continuum. The difference between the piecewise polynomial method and full convex hull method in absorption band center and band area ratio is less than 1%. In addition, we tested the retrieval of Wo and Fs with the spectral feature parameters from different continuums and find that continuum composed by piecewise linear equation is appropriate.

Citation Download Citation

Chao Wang, Xiangsui Zeng, Jia Li, Liyan Shang, and Jiong Feng "A comparative study on continuum removal for Chang’E-4 VNIS hyperspectral data and its impact on elements retrieval", Proc. SPIE 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 127052Y (27 June 2023); https://doi.org/10.1117/12.2680038

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Absorption

Minerals

Short wave infrared radiation

Reflectivity

Near infrared

Visible radiation

Light absorption

Show All Keywords

Keywords/Phrases

Search In:

Publication Years