GFM v.4 quality assessment for three severe floods

Since its start in 2021, the Global Flood Monitoring (GFM) product of the Copernicus Emergency Management Service has been continuously enhancing the quality of its outputs, developing new components for its satellite-derived data post-processing, refining its algorithms, and publishing the results of its regular (quarterly) product and service quality assessments.

The most recent GFM product and service quality assessment (for Q3 of 2025) includes the evaluation of the performance of the latest version of GFM (i.e. v.4) for the severe flooding that struck the Eastern India (August 2017), Central Romania (May 2025) and Northern Thailand (July 2025). For these Use Cases, GFM v.4 achieved an average flood classification accuracy (measured using the Critical Success Index) of 79.6%. In all three cases the overall accuracy largely exceeded 95%, and in two cases out of three GFM achieved an omission error well below 5%. The figure below shows the performance metrics for the three Use Cases.

More details will be available in the GFM Product and Service Quality Assessment Reports that we publish on an annual basis and that are available here.

We encourage you to check back for further news and developments!

 

By CEMS GloFAS and GFM Teams     Oct. 29, 2025, 6:25 p.m.