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Multiple Images Improve Lake CDOM Estimation: Building Better Landsat 8 Empirical Algorithms across Southern Canada
| Content Provider | MDPI |
|---|---|
| Author | Koll-Egyed, Talia Cardille, Jeffrey A. |
| Copyright Year | 2021 |
| Description | Coloured dissolved organic matter (CDOM) is an important water property for lake management. Remote sensing using empirical algorithms has been used to estimate CDOM, with previous studies relying on coordinated field campaigns that coincided with satellite overpass. However, this requirement reduces the maximum possible sample size for model calibration. New satellites and advances in cloud computing platforms offer opportunities to revisit assumptions about methods used for empirical algorithm calibration. Here, we explore the opportunities and limits of using median values of Landsat 8 satellite images across southern Canada to estimate CDOM. We compare models created using an expansive view of satellite image availability with those emphasizing a tight timing between the date of field sampling and the date of satellite overpass. Models trained on median band values from across multiple summer seasons performed better (adjusted $R^{2}$ = 0.70, N = 233) than models for which imagery was constrained to a 30-day time window (adjusted $R^{2}$ = 0.45). Model fit improved rapidly when incorporating more images, producing a model at a national scale that performed comparably to others found in more limited spatial extents. This research indicated that dense satellite imagery holds new promise for understanding relationships between in situ CDOM and satellite reflectance data across large areas. |
| Starting Page | 3615 |
| e-ISSN | 20724292 |
| DOI | 10.3390/rs13183615 |
| Journal | Remote Sensing |
| Issue Number | 18 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-10 |
| Access Restriction | Open |
| Subject Keyword | Remote Sensing Satellite Remote Sensing Landsat 8 Oli Coloured Dissolved Organic Matter Canadian Lakes Nserc Canadian Lake Pulse Network Empirical Algorithm |
| Content Type | Text |
| Resource Type | Article |
