Academic Journal
Coral Bleaching Detection in the Hawaiian Islands Using Spatio-Temporal Standardized Bottom Reflectance and Planet Dove Satellites
| العنوان: | Coral Bleaching Detection in the Hawaiian Islands Using Spatio-Temporal Standardized Bottom Reflectance and Planet Dove Satellites |
|---|---|
| المؤلفون: | Yaping Xu, Nicholas R. Vaughn, David E. Knapp, Roberta E. Martin, Christopher Balzotti, Jiwei Li, Shawna A. Foo, Gregory P. Asner |
| المصدر: | Remote Sensing; Volume 12; Issue 19; Pages: 3219 |
| بيانات النشر: | Multidisciplinary Digital Publishing Institute |
| سنة النشر: | 2020 |
| المجموعة: | MDPI Open Access Publishing |
| مصطلحات موضوعية: | coral bleaching, coral reef, Hawaiian Islands, remote sensing, Planet Dove |
| جغرافية الموضوع: | agris |
| الوصف: | 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. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | Coral Reefs Remote Sensing; https://dx.doi.org/10.3390/rs12193219 |
| DOI: | 10.3390/rs12193219 |
| الاتاحة: | https://doi.org/10.3390/rs12193219 |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: | edsbas.D49E7129 |
| قاعدة البيانات: | BASE |
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