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D-Flow FM (formerly Unstruc) is a shallow water flow solver on flexible meshes (also known as 'unstructured grids'). The output data of D-Flow are stored in NetCDF files. Since a convention for storing unstructured grid data in NetCDF files didn't exist, we have started to define an extension to the CF standard. Meanwhile this effort has been linked to other international initiatives, and the latest proposal for the conventions can be found on this unstructured grid page. Although we lead and follow these developments, we also want to keep the output files relatively stable, hence the D-Flow FM output files don't always follow the proposed conventions exactly. This page describes the format of the NetCDF files that are currently produced by D-Flow FM.
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