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Capturing coastal water clarity variability with Landsat 8
Kelly M A Luis1, Jennie E Rheuban2, Maria T Kavanaugh3
1School for the Environment, University of Massachusetts Boston, Boston, MA, USA.
Marine Pollution Bulletin
|October 9, 2019
Summary
Coastal water clarity, measured by Secchi disk depth (ZSD), was validated using Landsat 8 (L8) satellite data. This merging of in situ and remote sensing data improves coastal water quality monitoring.
Area of Science:
- Environmental Science
- Remote Sensing
- Oceanography
Background:
- Coastal water clarity is vital for aquatic habitats and is influenced by various environmental factors.
- Systematic observations are essential for tracking changes in water clarity and their ecological impacts.
Purpose of the Study:
- To validate Secchi disk depth (ZSD) data derived from Landsat 8 (L8) imagery using in situ measurements.
- To generate high-resolution maps of coastal water clarity.
Main Methods:
- Compiled in situ ZSD data from Boston Harbor, Buzzards Bay, Cape Cod Bay, and Narragansett Bay.
- Validated ZSD estimates from 58 L8 images against in situ data.
- Assessed agreement using metrics like RMSE and MAPD.
Main Results:
- Acceptable agreement was found between in situ and L8 ZSD in Buzzards Bay, Cape Cod Bay, and Narragansett Bay.
- Specific RMSE and MAPD values indicate reliable ZSD estimations from L8 imagery.
- High spatial resolution ZSD maps were generated.
Conclusions:
- Merging in situ ZSD data with high-resolution remote sensing estimates significantly enhances coastal water quality monitoring.
- Landsat 8 imagery provides a valuable tool for assessing coastal water clarity at high spatial resolutions.
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