The importance of atmospheric correction for airborne hyperspectral remote sensing of shallow waters: application to depth estimation
Accurate determination of water depth is indispensable in multiple aspects of civil engineering (dock construction, dikes, submarines outfalls, trench control, etc.). To determine the type of atmospheric correction most appropriate for the depth estimation, different accuracies are required. Acc...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-10-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/10/3919/2017/amt-10-3919-2017.pdf |
| Summary: | Accurate determination of water depth is indispensable in multiple aspects of
civil engineering (dock construction, dikes, submarines outfalls, trench
control, etc.). To determine the type of atmospheric correction most
appropriate for the depth estimation, different accuracies are required.
Accuracy in bathymetric information is highly dependent on the atmospheric
correction made to the imagery. The reduction of effects such as glint and
cross-track illumination in homogeneous shallow-water areas improves the
results of the depth estimations. The aim of this work is to assess the best
atmospheric correction method for the estimation of depth in shallow waters,
considering that reflectance values cannot be greater than 1.5 % because
otherwise the background would not be seen. This paper addresses the use of
hyperspectral imagery to quantitative bathymetric mapping and explores one of
the most common problems when attempting to extract depth information in
conditions of variable water types and bottom reflectances. The current work
assesses the accuracy of some classical bathymetric algorithms
(Polcyn–Lyzenga, Philpot, Benny–Dawson, Hamilton, principal component
analysis) when four different atmospheric correction methods are applied and
water depth is derived. No atmospheric correction is valid for all type of
coastal waters, but in heterogeneous shallow water the model of atmospheric
correction 6S offers good results. |
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| ISSN: | 1867-1381 1867-8548 |