A simple and robust shade correction scheme for remote sensing reflectance obtained by the skylight-blocked approach
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2021 |
| Auteurs (5) | : | XIAOLONG Yu ZHONGPING Lee ZHEHAI Shang HUA Lin GONG Lin |
| Revue scientifique | : | Optics Express |
| Volume | : | 29 |
| Fascicule | : | 1 |
| Pages | : | |
| DOI | : | 10.1364/OE.412887 |
| URL | : | http://www.opticsexpress.org/abstract.cfm?uri=oe-29-1-470 |
| Abstract | : | The skylight-blocked approach (SBA) provides a direct and high-precision measurement of the water-leaving radiance (Lw), which allows a confident determination of the remote sensing reflectance (Rrs), where Rrs is defined as the ratio of Lw to the downwelling irradiance just above the surface. However, the Rrs obtained by SBA is subject to self-shading error. The present shade error correction scheme (Shang17, [Appl. Opt. 56, 7033-7040, 2017]), implemented via spectral optimization, encounters large errors if there is a mismatch in the spectral models of the component inherent optical properties (IOPs). Following the concept of the quasi-analytical algorithm (QAA, [Appl. Opt. 41, 5755-5772, 2002]), a novel scheme (ShadeCorrQAA) is proposed without the need to model the component IOPs. Evaluations with numerical simulations and controlled measurements show that ShadeCorrQAA outperforms Shang17 in all water types and can correct the shade impact excellently, even for highly productive waters. ShadeCorrQAA is further improved at the chlorophyll fluorescence band, where a constructed absorption coefficient is used to estimate the shade error. Collectively, ShadeCorrQAA, with higher accuracy and broader applicability than Shang17, is recommended for the shade correction associated with SBA and other similar measurements where there is a shade impact on Rrs. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Xiaolong Y, Zhongping L, Zhehai S, Hua L, Gong L (2021) A simple and robust shade correction scheme for remote sensing reflectance obtained by the skylight-blocked approach. Opt Express 29 | doi: 10.1364/OE.412887
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