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Open AccessArticle

An Introduction to the Geostationary-NASA Earth Exchange (GeoNEX) Products: 1. Top-of-Atmosphere Reflectance and Brightness Temperature

1
NASA Ames Research Center, Moffett Field, CA 94035, USA
2
School of Natural Sciences, California State University Monterey Bay, Seaside, CA 93955, USA
3
Bay Area Environment Research Institute, Moffett Field, CA 94035, USA
4
JAXA Earth Observation Research Center, Sengen, Tsukuba, Ibaraki 305-8505, Japan
5
Center for Environmental Remote Sensing, Chiba University, Chiba 263-8522, Japan
6
NOAA/NESDIS/STAR, NCWCP, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Current Affiliation: School of Geography and Resources, Guizhou Education University, Guiyang 550018, China.
Remote Sens. 2020, 12(8), 1267; https://doi.org/10.3390/rs12081267
Received: 23 March 2020 / Revised: 10 April 2020 / Accepted: 11 April 2020 / Published: 17 April 2020
(This article belongs to the Special Issue Earth Monitoring from A New Generation of Geostationary Satellites)
GeoNEX is a collaborative project led by scientists from NASA, NOAA, and many other institutes around the world to generate Earth monitoring products using data streams from the latest Geostationary (GEO) sensors including the GOES-16/17 Advanced Baseline Imager (ABI), the Himawari-8/9 Advanced Himawari Imager (AHI), and more. An accurate and consistent product of the Top-Of-Atmosphere (TOA) reflectance and brightness temperature is the starting point in the scientific processing pipeline and has significant influences on the downstream products. This paper describes the main steps and the algorithms in generating the GeoNEX TOA products, starting from the conversion of digital numbers to physical quantities with the latest radiometric calibration information. We implement algorithms to detect and remove residual georegistration uncertainties automatically in both GOES and Himawari L1bdata, adjust the data for topographic relief, estimate the pixelwise data-acquisition time, and accurately calculate the solar illumination angles for each pixel in the domain at every time step. Finally, we reproject the TOA products to a globally tiled common grid in geographic coordinates in order to facilitate intercomparisons and/or synergies between the GeoNEX products and existing Earth observation datasets from polar-orbiting satellites. View Full-Text
Keywords: geostationary satellite; GOES-16; Himawari-8; top-of-atmosphere; radiance; brightness temperature; bidirectional-reflectance factor; NASA Earth Exchange (NEX) geostationary satellite; GOES-16; Himawari-8; top-of-atmosphere; radiance; brightness temperature; bidirectional-reflectance factor; NASA Earth Exchange (NEX)
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MDPI and ACS Style

Wang, W.; Li, S.; Hashimoto, H.; Takenaka, H.; Higuchi, A.; Kalluri, S.; Nemani, R. An Introduction to the Geostationary-NASA Earth Exchange (GeoNEX) Products: 1. Top-of-Atmosphere Reflectance and Brightness Temperature. Remote Sens. 2020, 12, 1267. https://doi.org/10.3390/rs12081267

AMA Style

Wang W, Li S, Hashimoto H, Takenaka H, Higuchi A, Kalluri S, Nemani R. An Introduction to the Geostationary-NASA Earth Exchange (GeoNEX) Products: 1. Top-of-Atmosphere Reflectance and Brightness Temperature. Remote Sensing. 2020; 12(8):1267. https://doi.org/10.3390/rs12081267

Chicago/Turabian Style

Wang, Weile; Li, Shuang; Hashimoto, Hirofumi; Takenaka, Hideaki; Higuchi, Atsushi; Kalluri, Satya; Nemani, Ramakrishna. 2020. "An Introduction to the Geostationary-NASA Earth Exchange (GeoNEX) Products: 1. Top-of-Atmosphere Reflectance and Brightness Temperature" Remote Sens. 12, no. 8: 1267. https://doi.org/10.3390/rs12081267

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