Spatio-Temporal Characteristics for Moon-Based Earth Observations
| Autor: | Hanlin Ye, Jing Huang, Guozhuang Shen, Huadong Guo, Runbo Dong, Guang Liu, Yu Deng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
North pole
Earth observation 010504 meteorology & atmospheric sciences Science 0211 other engineering and technologies Spherical cap 02 engineering and technology Moon-based Earth observations 01 natural sciences spatio-temporal characteristics intervisibility condition spherical cap Physics::Geophysics 021101 geological & geomatics engineering 0105 earth and related environmental sciences Elevation angle Geodesy The arctic Nadir point Observation duration Physics::Space Physics General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics Geology Earth (classical element) |
| Zdroj: | Remote Sensing, Vol 12, Iss 2848, p 2848 (2020) Remote Sensing; Volume 12; Issue 17; Pages: 2848 |
| ISSN: | 2072-4292 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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