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Multi-Temporal UAV Data and Object-Based Image Analysis (OBIA) for Estimation of Substrate Changes in a Post-Bleaching Scenario on a Maldivian Reef
- Source :
- Remote Sensing, Volume 12, Issue 13, Pages: 2093, Remote Sensing, Vol 12, Iss 2093, p 2093 (2020)
- Publication Year :
- 2020
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2020.
-
Abstract
- Coral reefs are declining worldwide as a result of the effects of multiple natural and anthropogenic stressors, including regional-scale temperature-induced coral bleaching. Such events have caused significant coral mortality, leading to an evident structural collapse of reefs and shifts in associated benthic communities. In this scenario, reasonable mapping techniques and best practices are critical to improving data collection to describe spatial and temporal patterns of coral reefs after a significant bleaching impact. Our study employed the potential of a consumer-grade drone, coupled with structure from motion and object-based image analysis to investigate for the first time a tool to monitor changes in substrate composition and the associated deterioration in reef environments in a Maldivian shallow-water coral reef. Three key substrate types (hard coral, coral rubble and sand) were detected with high accuracy on high-resolution orthomosaics collected from four sub-areas. Multi-temporal acquisition of UAV data allowed us to compare the classified maps over time (February 2017, November 2018) and obtain evidence of the relevant deterioration in structural complexity of flat reef environments that occurred after the 2016 mass bleaching event. We believe that our proposed methodology offers a cost-effective procedure that is well suited to generate maps for the long-term monitoring of changes in substrate type and reef complexity in shallow water.
- Subjects :
- 0106 biological sciences
010504 meteorology & atmospheric sciences
object-based image analysis (OBIA)
Coral bleaching
Coral
engineering.material
01 natural sciences
Structural complexity
unmanned aerial vehicles (UAV)
Republic of Maldives
lcsh:Science
Reef
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
010604 marine biology & hydrobiology
Rubble
coral bleaching
Coral reef
Substrate (marine biology)
Oceanography
Benthic zone
engineering
coral reef
General Earth and Planetary Sciences
Environmental science
lcsh:Q
structure from motion (SfM)
coral reefs
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Database :
- OpenAIRE
- Journal :
- Remote Sensing
- Accession number :
- edsair.doi.dedup.....abd9fa08b8bffbe96ca9017a257908ea
- Full Text :
- https://doi.org/10.3390/rs12132093