A New Set of MODIS Land Products (MCD18): Downward Shortwave Radiation and Photosynthetically Active Radiation

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dc.contributor.authorWang, Dongdong
dc.contributor.authorLiang, Shunlin
dc.contributor.authorZhang, Yi
dc.contributor.authorGao, Xueyuan
dc.contributor.authorBrown, Meredith G. L.
dc.contributor.authorJia, Aolin
dc.date.accessioned2023-11-13T18:12:49Z
dc.date.available2023-11-13T18:12:49Z
dc.date.issued2020-01-03
dc.description.abstractSurface downward shortwave radiation (DSR) and photosynthetically active radiation (PAR), its visible component, are key parameters needed for many land process models and terrestrial applications. Most existing DSR and PAR products were developed for climate studies and therefore have coarse spatial resolutions, which cannot satisfy the requirements of many applications. This paper introduces a new global high-resolution product of DSR (MCD18A1) and PAR (MCD18A2) over land surfaces using the MODIS data. The current version is Collection 6.0 at the spatial resolution of 5 km and two temporal resolutions (instantaneous and three-hour). A look-up table (LUT) based retrieval approach was chosen as the main operational algorithm so as to generate the products from the MODIS top-of-atmosphere (TOA) reflectance and other ancillary data sets. The new MCD18 products are archived and distributed via NASA’s Land Processes Distributed Active Archive Center (LP DAAC). The products have been validated based on one year of ground radiation measurements at 33 Baseline Surface Radiation Network (BSRN) and 25 AmeriFlux stations. The instantaneous DSR has a bias of −15.4 W/m2 and root mean square error (RMSE) of 101.0 W/m2, while the instantaneous PAR has a bias of −0.6 W/m2 and RMSE of 45.7 W/m2. RMSE of daily DSR is 32.3 W/m2, and that of the daily PAR is 13.1 W/m2. The accuracy of the new MODIS daily DSR data is higher than the GLASS product and lower than the CERES product, while the latter incorporates additional geostationary data with better capturing DSR diurnal variability. MCD18 products are currently under reprocessing and the new version (Collection 6.1) will provide improved spatial resolution (1 km) and accuracy.
dc.description.urihttps://doi.org/10.3390/rs12010168
dc.identifierhttps://doi.org/10.13016/dspace/lxjp-semb
dc.identifier.citationWang, D.; Liang, S.; Zhang, Y.; Gao, X.; Brown, M.G.L.; Jia, A. A New Set of MODIS Land Products (MCD18): Downward Shortwave Radiation and Photosynthetically Active Radiation.
dc.identifier.urihttp://hdl.handle.net/1903/31366
dc.language.isoen_US
dc.publisherMDPI
dc.relation.isAvailableAtCollege of Behavioral & Social Sciencesen_us
dc.relation.isAvailableAtGeographyen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectdownward shortwave radiation
dc.subjectsolar radiation
dc.subjectphotosynthetocally active radiation
dc.subjectMODIS
dc.subjectsatellite product
dc.subjectvalidation
dc.titleA New Set of MODIS Land Products (MCD18): Downward Shortwave Radiation and Photosynthetically Active Radiation
dc.typeArticle
local.equitableAccessSubmissionNo

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