Global Ocean Health Index (OHI) Assessments

entry, Regulatory
The Global Ocean Health Index measures performance of ten societal goals for healthy oceans on a quantitative scale of increasing health from 0 to 100, and combines these scores into a single Index score, for each country and globally. The Global Ocean Health Index involves synthesizing highly heterogeneous information from nearly one hundred sources. Data from each source are formatted and used to calculate Index scores using freely available coding and version control software. One of the goals of the project is to make all their data and methods available to anyone who wants to further explore the results or use the data for other projects.


resolution annual
period historical, present
coverage 2012–present


gridded no
type derived data
formats tif, shp


published yes,
link to data
availability public


resolution by country
coverage global

Major Variables

Key References

  • Halpern, B. S., Longo, C., Hardy, D., McLeod, K. L., Samhouri, J. F., Katona, S. K., et al. (2012). An index to assess the health and benefits of the global ocean. Nature, 488(7413), 615–620.
  • Halpern, B. S., Frazier, M., Afflerbach, J., O’Hara, C., Katona, S., Stewart Lowndes, J. S., et al. (2017). Drivers and implications of change in global ocean health over the past ve years. Plos One, 12(7), e0178267.