High-resolution habitat and bathymetry maps for 65,000 sq. km of Earth’s remotest coral reefs

[2019]

A study from scientists at the Khaled bin Sultan Living Oceans Foundation and the University of Miami offers a new way to accurately map coral reefs using a combination of Earth-orbiting satellites and field observations. Using this new method, the scientists mapped over 65,000 km2 of coral reefs and surrounding habitats--by far the largest collection of high-resolution coral reef maps ever made.

Published in Coral Reefs, April 2019

By Sam J. Purkis, Arthur C. R. Gleason, Charlotte R. Purkis, Alexandra C. Dempsey, Philip G. Renaud, Mohamed Faisal, Steven Saul, Jeremy M. Kerr, Garrett B. Johnson, Brett M. Taylor, William D. Robbins, Erik C. Franklin, Rob Toonen, Brian Bowen, and J. Howard Choat

Abstract

With compelling evidence that half the world’s coral reefs have been lost over the last four decades, there is urgent motivation to understand where reefs are located and their health. Without such basic baseline information, it is challenging to mount a response to the reef crisis on the global scale at which it is occurring.

To combat this lack of baseline data, the Khaled bin Sultan Living Oceans Foundation embarked on a 10-yr survey of a broad selection of Earth’s remotest reef sites—the Global Reef Expedition. This paper focuses on one output of this expedition, which is meter-resolution seafloor habitat and bathymetry maps developed from DigitalGlobe satellite imagery and calibrated by field observations. Distributed on an equatorial transect across 11 countries, these maps cover 65,000 sq. km of shallow-water reef-dominated habitat. The study represents an order of magnitude greater area than has been mapped previously at high resolution.

We present a workflow demonstrating that DigitalGlobe imagery can be processed to useful products for reef conservation at regional to global scale. We further emphasize that the performance of our mapping workflow does not deteriorate with increasing size of the site mapped. Whereas our workflow can produce regional-scale benthic habitat maps for the morphologically diverse reefs of the Pacific and Indian oceans, as well as the more depauperate reefs of the Atlantic, accuracies are substantially higher for the former than the latter. It is our hope that the map products delivered to the community by the Living Oceans Foundation will be utilized for conservation and act to catalyze new initiatives to chart the status of coral reefs globally.

From Mangrove Mud to Meaningful Work: Desta’s J.A.M.I.N. Journey

Some students I remember for their grades, their quick answers, or a moment that made the whole class laugh. Others I remember for the way they stepped into the mangroves.

Desta was the kind of student who thrived outdoors. While some students hesitated at the edge of the mud, he walked right in. And when he inevitably got stuck — because everyone does — he didn’t get frustrated. He laughed. Covered in mud, holding mangrove propagules in his hands, he embraced the experience fully.

Even then, it was clear that he was connecting with the environment in a way that went beyond the lesson plan…

From Students to Stewards: A Full-Circle Moment for J.A.M.I.N.

There are certain faces you never forget.

Over the years, hundreds of students have stepped into mangrove forests with us through the Jamaica Awareness of Mangroves in Nature (J.A.M.I.N.) program. I may not always remember every name, but I remember the expressions — the hesitation before stepping into thick mud, the laughter when someone loses a shoe, the look of surprise when they catch that unmistakable sulfur smell rising from the mangrove soil…

Abstract

Related Posts

From Mangrove Mud to Meaningful Work: Desta’s J.A.M.I.N. Journey

From Students to Stewards: A Full-Circle Moment for J.A.M.I.N.