Evaluation of MODIS ocean colour products at a northeast United States coast site near the Martha's Vineyard Coastal Observatory
| Autor: | Janet W. Campbell, Brent N. Holben, Hui Feng, Douglas Vandemark |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | International Journal of Remote Sensing. 29:4479-4497 |
| ISSN: | 1366-5901 0143-1161 |
| Popis: | Moderate Resolution Imaging Spectroradiometer (MODIS) marine and atmospheric products were evaluated using match-ups of MODIS and in situ measurements collected by an above-water radiometric system, the SeaWiFS Photometer Revision for Incident Surface Measurements (SeaPRISM), deployed near the Martha's Vineyard Coastal Observatory from 2004 to 2005. The products evaluated include the normalized water-leaving radiance L wn in the visible and near-infrared bands, and the aerosol optical thickness at 870 nm τa(870), and the Angstrom exponent α(531). With a restricted match-up criterion, the result shows that the MODIS-retrieved L wn at 488, 531 and 551 nm agree very well with SeaPRISM measurements, giving mean per cent differences δ(%) of 3-7%, absolute mean per cent differences |δ|(%) of ∼16%, and coefficient of determination R 2 of 0.84-0.88. However, the MODIS-retrieved L wn at 412 nm are underestimated significantly with δ(%), |δ|(%) and R 2 of -35%, 57% and 0.32, respectively, corresponding to a consistent overestimation and underestimation for the MODIS-retrieved τa(870) and α(531), respectively. Temporal patterns of match-ups revealing two distinct cases of the discrepancy of MODIS retrievals from in situ SeaPRISM measurements are discussed. |
| Databáze: | OpenAIRE |
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