Earth, Planets and Space (Dec 2017)
Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction
- Kazunori Ogohara,
- Masahiro Takagi,
- Shin-ya Murakami,
- Takeshi Horinouchi,
- Manabu Yamada,
- Toru Kouyama,
- George L. Hashimoto,
- Takeshi Imamura,
- Yukio Yamamoto,
- Hiroki Kashimura,
- Naru Hirata,
- Naoki Sato,
- Atsushi Yamazaki,
- Takehiko Satoh,
- Naomoto Iwagami,
- Makoto Taguchi,
- Shigeto Watanabe,
- Takao M. Sato,
- Shoko Ohtsuki,
- Tetsuya Fukuhara,
- Masahiko Futaguchi,
- Takeshi Sakanoi,
- Shingo Kameda,
- Ko-ichiro Sugiyama,
- Hiroki Ando,
- Yeon Joo Lee,
- Masato Nakamura,
- Makoto Suzuki,
- Chikako Hirose,
- Nobuaki Ishii,
- Takumi Abe
Affiliations
- Kazunori Ogohara
- School of Engineering, University of Shiga Prefecture
- Masahiro Takagi
- Division of Science, Kyoto Sangyo University
- Shin-ya Murakami
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Takeshi Horinouchi
- Faculty of Environmental Earth Science, Hokkaido University
- Manabu Yamada
- Planetary Exploration Research Center, Chiba Institute of Technology
- Toru Kouyama
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology
- George L. Hashimoto
- Department of Earth Science, Okayama University
- Takeshi Imamura
- Graduate School of Frontier Sciences, University of Tokyo
- Yukio Yamamoto
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Hiroki Kashimura
- Department of Planetology/Center for Planetary Science, Kobe University
- Naru Hirata
- School of Computer Science and Engineering, The University of Aizu
- Naoki Sato
- Natural Science Division, Tokyo Gakugei University
- Atsushi Yamazaki
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Takehiko Satoh
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Naomoto Iwagami
- Makoto Taguchi
- Department of Physics, Rikkyo University
- Shigeto Watanabe
- Hokkaido Information University
- Takao M. Sato
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Shoko Ohtsuki
- School of Commerce, Senshu University
- Tetsuya Fukuhara
- Department of Physics, Rikkyo University
- Masahiko Futaguchi
- Omori Medical Center, Toho University
- Takeshi Sakanoi
- Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University
- Shingo Kameda
- Department of Physics, Rikkyo University
- Ko-ichiro Sugiyama
- Department of Information Engineering, National Institute of Technology, Matsue College
- Hiroki Ando
- Division of Science, Kyoto Sangyo University
- Yeon Joo Lee
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Masato Nakamura
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Makoto Suzuki
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Chikako Hirose
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Nobuaki Ishii
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Takumi Abe
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- DOI
- https://doi.org/10.1186/s40623-017-0749-5
- Journal volume & issue
-
Vol. 69,
no. 1
pp. 1 – 16
Abstract
Abstract We provide an overview of data products from observations by the Japanese Venus Climate Orbiter, Akatsuki, and describe the definition and content of each data-processing level. Levels 1 and 2 consist of non-calibrated and calibrated radiance (or brightness temperature), respectively, as well as geometry information (e.g., illumination angles). Level 3 data are global-grid data in the regular longitude–latitude coordinate system, produced from the contents of Level 2. Non-negligible errors in navigational data and instrumental alignment can result in serious errors in the geometry calculations. Such errors cause mismapping of the data and lead to inconsistencies between radiances and illumination angles, along with errors in cloud-motion vectors. Thus, we carefully correct the boresight pointing of each camera by fitting an ellipse to the observed Venusian limb to provide improved longitude–latitude maps for Level 3 products, if possible. The accuracy of the pointing correction is also estimated statistically by simulating observed limb distributions. The results show that our algorithm successfully corrects instrumental pointing and will enable a variety of studies on the Venusian atmosphere using Akatsuki data.
Keywords
