{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T16:23:44Z","timestamp":1774369424235,"version":"3.50.1"},"reference-count":40,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2021,4,1]],"date-time":"2021-04-01T00:00:00Z","timestamp":1617235200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100009105","name":"Ministry of Internal Affairs and Communications","doi-asserted-by":"publisher","award":["MIC\/SCOPE #191502001"],"award-info":[{"award-number":["MIC\/SCOPE #191502001"]}],"id":[{"id":"10.13039\/501100009105","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["KAKENHI Grant Number 19K14789"],"award-info":[{"award-number":["KAKENHI Grant Number 19K14789"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Radiometric calibration utilizing the Moon as a reference source is termed as lunar calibration. It is a useful method for evaluating the performance of optical sensors onboard satellites orbiting the Earth. Lunar calibration provides sufficient radiometric calibration opportunities without requiring any special equipment, and is suitable for nano\/microsatellites. This study applies lunar calibration to a multispectral sensor, Ocean Observation Camera (OOC), on board a microsatellite named Rapid International Scientific Experiment Satellite. Simulating the brightness of the Moon based on the RObotic Lunar Observatory and SELENE\/Spectrum Profiler models, sensitivity degradation was proven to be negligible in any of the four spectral bands of the OOC with the sensor temperature correction. A bluing trend in the OOC\u2019s sensor sensitivity was revealed, indicating a shorter observation wavelength shows larger irradiance. Comparing the top-of-atmosphere reflectance of Railroad Valley Playa with the Radiometric Calibration Network dataset revealed that the derived calibration parameter from the lunar calibration was valid for correcting the bluing trend in the visible range. Although the lunar and vicarious calibration parameters for the infrared band were unexpectedly inconsistent, lunar calibration could potentially contribute toward estimating the contaminated background radiance in the Earth observation images.<\/jats:p>","DOI":"10.3390\/s21072429","type":"journal-article","created":{"date-parts":[[2021,4,1]],"date-time":"2021-04-01T10:44:01Z","timestamp":1617273841000},"page":"2429","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Radiometric Calibration for a Multispectral Sensor Onboard RISESAT Microsatellite Based on Lunar Observations"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8543-6556","authenticated-orcid":false,"given":"Masataka","family":"Imai","sequence":"first","affiliation":[{"name":"Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo 135-0064, Japan"},{"name":"AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Kashiwa 277-0882, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3896-7252","authenticated-orcid":false,"given":"Junichi","family":"Kurihara","sequence":"additional","affiliation":[{"name":"Faculty of Science, Hokkaido University, Sapporo 001-0021, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1060-3986","authenticated-orcid":false,"given":"Toru","family":"Kouyama","sequence":"additional","affiliation":[{"name":"Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo 135-0064, Japan"},{"name":"AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Kashiwa 277-0882, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshinori","family":"Kuwahara","sequence":"additional","affiliation":[{"name":"Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shinya","family":"Fujita","sequence":"additional","affiliation":[{"name":"Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuji","family":"Sakamoto","sequence":"additional","affiliation":[{"name":"Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuji","family":"Sato","sequence":"additional","affiliation":[{"name":"Department of Aerospace Engineering, Tohoku University, Sendai 980-8579, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sei-Ichi","family":"Saitoh","sequence":"additional","affiliation":[{"name":"Arctic Research Center, Hokkaido University, Sapporo 001-0021, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takafumi","family":"Hirata","sequence":"additional","affiliation":[{"name":"Arctic Research Center, Hokkaido University, Sapporo 001-0021, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8298-9841","authenticated-orcid":false,"given":"Hirokazu","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8567, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yukihiro","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Faculty of Science, Hokkaido University, Sapporo 001-0021, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1016\/j.actaastro.2017.04.034","article-title":"Towards Disruptions in Earth Observation? 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