Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction
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 we...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2017-12-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40623-017-0749-5 |
| _version_ | 1818037264535519232 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Kazunori Ogohara |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T07:24:05Z |
| format | Article |
| id | doaj.art-934ba501a5894cfa8638215c1c27ed6a |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-10T07:24:05Z |
| publishDate | 2017-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-934ba501a5894cfa8638215c1c27ed6a2022-12-22T01:57:44ZengSpringerOpenEarth, Planets and Space1880-59812017-12-0169111610.1186/s40623-017-0749-5Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correctionKazunori Ogohara0Masahiro Takagi1Shin-ya Murakami2Takeshi Horinouchi3Manabu Yamada4Toru Kouyama5George L. Hashimoto6Takeshi Imamura7Yukio Yamamoto8Hiroki Kashimura9Naru Hirata10Naoki Sato11Atsushi Yamazaki12Takehiko Satoh13Naomoto IwagamiMakoto Taguchi14Shigeto Watanabe15Takao M. Sato16Shoko Ohtsuki17Tetsuya Fukuhara18Masahiko Futaguchi19Takeshi Sakanoi20Shingo Kameda21Ko-ichiro Sugiyama22Hiroki Ando23Yeon Joo Lee24Masato Nakamura25Makoto Suzuki26Chikako Hirose27Nobuaki Ishii28Takumi Abe29School of Engineering, University of Shiga PrefectureDivision of Science, Kyoto Sangyo UniversityInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyFaculty of Environmental Earth Science, Hokkaido UniversityPlanetary Exploration Research Center, Chiba Institute of TechnologyArtificial Intelligence Research Center, National Institute of Advanced Industrial Science and TechnologyDepartment of Earth Science, Okayama UniversityGraduate School of Frontier Sciences, University of TokyoInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyDepartment of Planetology/Center for Planetary Science, Kobe UniversitySchool of Computer Science and Engineering, The University of AizuNatural Science Division, Tokyo Gakugei UniversityInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyDepartment of Physics, Rikkyo UniversityHokkaido Information UniversityInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencySchool of Commerce, Senshu UniversityDepartment of Physics, Rikkyo UniversityOmori Medical Center, Toho UniversityPlanetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku UniversityDepartment of Physics, Rikkyo UniversityDepartment of Information Engineering, National Institute of Technology, Matsue CollegeDivision of Science, Kyoto Sangyo UniversityInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyInstitute of Space and Astronautical Science, Japan Aerospace Exploration AgencyAbstract 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.http://link.springer.com/article/10.1186/s40623-017-0749-5VenusData productPointing correctionEllipse-fitting technique |
| spellingShingle | 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 Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction Earth, Planets and Space Venus Data product Pointing correction Ellipse-fitting technique |
| title | Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction |
| title_full | Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction |
| title_fullStr | Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction |
| title_full_unstemmed | Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction |
| title_short | Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction |
| title_sort | overview of akatsuki data products definition of data levels method and accuracy of geometric correction |
| topic | Venus Data product Pointing correction Ellipse-fitting technique |
| url | http://link.springer.com/article/10.1186/s40623-017-0749-5 |
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