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Article

Spatio-Temporal Characteristics for Moon-Based Earth Observations

1
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
3
Qian Xuesen Laboratory of Space and Technology, China Academy of Space Technology, Beijing 100094, China
4
School of Earth and Space Sciences, Peking University, Beijing 100871, China
5
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(17), 2848; https://doi.org/10.3390/rs12172848
Received: 20 May 2020 / Revised: 26 August 2020 / Accepted: 31 August 2020 / Published: 2 September 2020
(This article belongs to the Special Issue Lunar Remote Sensing and Applications)
Spatio-temporal characteristics are the crucial conditions for Moon-based Earth observations. In this study, we established a Moon-based Earth observation geometric model by considering the intervisibility condition between a Moon-based platform and observed points on the Earth, which can analyze the spatio-temporal characteristics of the observations of Earth’s hemisphere. Furthermore, a formula for the spherical cap of the Earth visibility region on the Moon is analytically derived. The results show that: (1) the observed Earth spherical cap has a diurnal period and varies with the nadir point. (2) All the annual global observation durations in different years show two lines that almost coincide with the Arctic circle and the Antarctic circle. Regions between the two lines remain stable, but the observation duration of the South pole and North pole changes every 18.6 years. (3) With the increase of the line-of-sight minimum observation elevation angle, the area of an intervisible spherical cap on the lunar surface is obviously decreased, and this cap also varies with the distance between the barycenter of the Earth and the barycenter of the Moon. In general, this study reveals the effects of the elevation angle on the spatio-temporal characteristics and additionally determines the change of area where the Earth’s hemisphere can be observed on the lunar surface; this information can provide support for the accurate calculation of Moon-based Earth hemisphere observation times. View Full-Text
Keywords: Moon-based Earth observations; spatio-temporal characteristics; intervisibility condition; spherical cap Moon-based Earth observations; spatio-temporal characteristics; intervisibility condition; spherical cap
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MDPI and ACS Style

Huang, J.; Guo, H.; Liu, G.; Shen, G.; Ye, H.; Deng, Y.; Dong, R. Spatio-Temporal Characteristics for Moon-Based Earth Observations. Remote Sens. 2020, 12, 2848. https://doi.org/10.3390/rs12172848

AMA Style

Huang J, Guo H, Liu G, Shen G, Ye H, Deng Y, Dong R. Spatio-Temporal Characteristics for Moon-Based Earth Observations. Remote Sensing. 2020; 12(17):2848. https://doi.org/10.3390/rs12172848

Chicago/Turabian Style

Huang, Jing, Huadong Guo, Guang Liu, Guozhuang Shen, Hanlin Ye, Yu Deng, and Runbo Dong. 2020. "Spatio-Temporal Characteristics for Moon-Based Earth Observations" Remote Sensing 12, no. 17: 2848. https://doi.org/10.3390/rs12172848

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