Name
Title | ||
|---|---|---|
Coral Bleaching Detection in the Hawaiian Islands Using Spatio-Temporal Standardized Bottom Reflectance and Planet Dove Satellites. |
Abstract | ||
|---|---|---|
We present a new method for the detection of coral bleaching using satellite time-series data. While the detection of coral bleaching from satellite imagery is difficult due to the low signal-to-noise ratio of benthic reflectance, we overcame this difficulty using three approaches: 1) specialized pre-processing developed for Planet Dove satellites, 2) a time-series approach for determining baseline reflectance statistics, and 3) a regional filter based on a preexisting map of live coral. The time-series was divided into a baseline period (April-July 2019), when no coral bleaching was known to have taken place, and a bleaching period (August 2019-present), when the bleaching was known to have occurred based on field data. The identification of the bleaching period allowed the computation of a Standardized Bottom Reflectance (SBR) for each region. SBR transforms the weekly bottom reflectance into a value relative to the baseline reflectance distribution statistics, increasing the sensitivity to bleaching detection. We tested three scales of the temporal smoothing of the SBR (weekly, cumulative average, and three-week moving average). Our field verification of coral bleaching throughout the main Hawaiian Islands showed that the cumulative average and three-week moving average smoothing detected the highest proportion of coral bleaching locations, correctly identifying 11 and 10 out of 18 locations, respectively. However, the three-week moving average provided a better sensitivity in coral bleaching detection, with a performance increase of at least one standard deviation, which helps define the confidence level of a detected bleaching event. |
Year | DOI | Venue |
|---|---|---|
2020 | 10.3390/rs12193219 | REMOTE SENSING |
Keywords | DocType | Volume |
coral bleaching,coral reef,Hawaiian Islands,remote sensing,Planet Dove | Journal | 12 |
Issue | Citations | PageRank |
19 | 0 | 0.34 |
References | Authors | |
0 | 8 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yaping Xu | 1 | 0 | 0.34 |
| nicholas r vaughn | 2 | 25 | 3.11 |
| david e knapp | 3 | 8 | 1.76 |
| Martin, R.E. | 4 | 15 | 3.66 |
| Christopher Balzotti | 5 | 0 | 0.34 |
| Jiwei Li | 6 | 0 | 0.34 |
| Shawna A. Foo | 7 | 0 | 0.34 |
| Gregory P Asner | 8 | 127 | 20.91 |