Analyse Your Data

Once you submit your data, your survey results can be viewed on the world map showing a graph with reef colour and coral type distribution.

Reef colour score distribution

This bar graph explains the distribution of colour scores
that you recorded for a particular reef.
This will tell you how healthy your reef is today.
A healthy reef has a majority of scores of 3 and more.

Coral type distribution

This pie chart shows the percentages of coral types you included in your survey. Our global database is publically available on the CoralWatch website. Anyone can compare the condition of different reefs at any one point in time, as well as the condition of a single reef over time.

Interpreting results

Some corals are naturally lighter than others. Regular surveys are needed to look at health over time or pick up trends of bleaching and recovery. Coral colour is just one indicator of coral health. Other indicators could be % coral cover, species diversity & richness, and the amount of macroalgae.

Bleaching alert

Through a validation analysis that compared 10 years of CoralWatch data to well-established bleaching events, CoralWatch has developed an evidence-based approach classifying our data. Based on analyses, an email alert will be sent when a survey has a 70% likelihood of representing a local bleaching event.


● Conduct additional CoralWatch surveys to confirm if a bleaching event is occurring.
● Spread the word – inspire others to help monitor your reefs (e.g. Facebook, Twitter).
● Contact your local reef management group to further investigate.
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Analyse your data further

For more instructions on data analysis - download the PDF .

Download data analysis PDF