Abstract
Accurate identification and understanding of spectral bio-signatures from possible extra terrestrial planets have received an ever increasing attention from both astronomy and space science communities in recent years. In pursuance of this subject, one of the most important scientific breakthroughs would be to obtain the detailed understanding on spectral biosignatures of the Earth, as it serves as a reference datum for accurate interpretation of collapsed (in temporal and spatial domains) information from the spectral measurement using TPF instruments. We report a new Integrated Ray Tracing (IRT) model capable of computing various spectral bio-signatures as they are observed from the Earth surface. The model includes the Sun, the full 3-D Earth, and an optical instrument, all combined into single ray tracing environment in real scale. In particular, the full 3-D Earth surface is constructed from high resolution coastal line data and defined with realistic reflectance and BSDF characteristics depending on wavelength, vegetation types and their distributions. We first examined the model validity by confirming the imaging and radiometric performance of the AmonRa visible channel camera, simulating the Earth observation from the L1 halo orbit. We then computed disk averaged spectra, light curves and NDVI indexes, leading to the construction of the observed disk averaged spectra at the AmonRa instrument detector plane. The model, computational procedure and the simulation results are presented. The future plan for the detailed spectral signature simulation runs for various input conditions including seasonal vegetation changes and variable cloud covers is discussed.
| Original language | English |
|---|---|
| Title of host publication | Instruments and Methods for Astrobiology and Planetary Missions XII |
| DOIs | |
| Publication status | Published - 2009 Nov 19 |
| Event | Instruments and Methods for Astrobiology and Planetary Missions XII - San Diego, CA, United States Duration: 2009 Aug 4 → 2009 Aug 6 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 7441 |
| ISSN (Print) | 0277-786X |
Other
| Other | Instruments and Methods for Astrobiology and Planetary Missions XII |
|---|---|
| Country | United States |
| City | San Diego, CA |
| Period | 09/8/4 → 09/8/6 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
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Integrated ray tracing simulation of spectral bio-signatures from full 3-D earth model. / Ryu, Dongok; Seong, Sehyun; Lee, Jae Min; Hong, Jinsuk; Jeong, Soomin; Jeong, Yukyeong; Kim, Sug-Whan.
Instruments and Methods for Astrobiology and Planetary Missions XII. 2009. 74410A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7441).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Integrated ray tracing simulation of spectral bio-signatures from full 3-D earth model
AU - Ryu, Dongok
AU - Seong, Sehyun
AU - Lee, Jae Min
AU - Hong, Jinsuk
AU - Jeong, Soomin
AU - Jeong, Yukyeong
AU - Kim, Sug-Whan
PY - 2009/11/19
Y1 - 2009/11/19
N2 - Accurate identification and understanding of spectral bio-signatures from possible extra terrestrial planets have received an ever increasing attention from both astronomy and space science communities in recent years. In pursuance of this subject, one of the most important scientific breakthroughs would be to obtain the detailed understanding on spectral biosignatures of the Earth, as it serves as a reference datum for accurate interpretation of collapsed (in temporal and spatial domains) information from the spectral measurement using TPF instruments. We report a new Integrated Ray Tracing (IRT) model capable of computing various spectral bio-signatures as they are observed from the Earth surface. The model includes the Sun, the full 3-D Earth, and an optical instrument, all combined into single ray tracing environment in real scale. In particular, the full 3-D Earth surface is constructed from high resolution coastal line data and defined with realistic reflectance and BSDF characteristics depending on wavelength, vegetation types and their distributions. We first examined the model validity by confirming the imaging and radiometric performance of the AmonRa visible channel camera, simulating the Earth observation from the L1 halo orbit. We then computed disk averaged spectra, light curves and NDVI indexes, leading to the construction of the observed disk averaged spectra at the AmonRa instrument detector plane. The model, computational procedure and the simulation results are presented. The future plan for the detailed spectral signature simulation runs for various input conditions including seasonal vegetation changes and variable cloud covers is discussed.
AB - Accurate identification and understanding of spectral bio-signatures from possible extra terrestrial planets have received an ever increasing attention from both astronomy and space science communities in recent years. In pursuance of this subject, one of the most important scientific breakthroughs would be to obtain the detailed understanding on spectral biosignatures of the Earth, as it serves as a reference datum for accurate interpretation of collapsed (in temporal and spatial domains) information from the spectral measurement using TPF instruments. We report a new Integrated Ray Tracing (IRT) model capable of computing various spectral bio-signatures as they are observed from the Earth surface. The model includes the Sun, the full 3-D Earth, and an optical instrument, all combined into single ray tracing environment in real scale. In particular, the full 3-D Earth surface is constructed from high resolution coastal line data and defined with realistic reflectance and BSDF characteristics depending on wavelength, vegetation types and their distributions. We first examined the model validity by confirming the imaging and radiometric performance of the AmonRa visible channel camera, simulating the Earth observation from the L1 halo orbit. We then computed disk averaged spectra, light curves and NDVI indexes, leading to the construction of the observed disk averaged spectra at the AmonRa instrument detector plane. The model, computational procedure and the simulation results are presented. The future plan for the detailed spectral signature simulation runs for various input conditions including seasonal vegetation changes and variable cloud covers is discussed.
UR - http://www.scopus.com/inward/record.url?scp=70449464608&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70449464608&partnerID=8YFLogxK
U2 - 10.1117/12.827968
DO - 10.1117/12.827968
M3 - Conference contribution
SN - 9780819477316
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Instruments and Methods for Astrobiology and Planetary Missions XII
ER -