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According to the Unidata website the Network Common Data Form (NetCDF) software was originally intended to create, access, and share array-oriented data in a form that is self-describing and portable. These deal with a variety of data types that encompass single-point observations, time series, regularly-spaced grids, and satellite or radar images.

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EFDC+ can currently write the native output in NetCDF-CF format for Windows and Linux. EFDC_Explorer (the pre-and post-processor for EFDC+) can also convert the binary files output by EFDC+ (*.OUT) to netCDF.nc files, including the derived water quality parameters. EFDC+ currently exports 44 parameters to NetCDF format. This allows EFDC+ output to be read and displayed on web servers.

EFDC+ exports the NetCDF files at the same interval that it produces the model linkages files, which is set in the tab for Timing and Linkage | Linkage | NetCDF

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The user may also select to Rotate Velocity. If this option is checked, the velocity field is rotated to true east and true north and if not checked then there is no rotation to true east and true north.

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Figure 1
Figure 1

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Figure 1. NetCDF Setting.

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Info
titleNote
  • After running the model, the user needs to close the EFDC+ run window using the carriage return before viewing the netCDF output. Using the X button on the run window will mean NetCDF output will not be written. 
  • EFDC+ now writes NetCDF output based on Lagrangian Particle Tracking output frequency , in the previous version it is the same time interval as the user set for EE linkageand writes to a separate file if selected LPT to generate NetCDF output.
  • The calendar date is the default date in the NetCDF output.
  • Layer ordering in the water column and sediment bed will be reversed in NetCDF compared to that of EE. 
  • Units in NetCDF are often different from those in EE, for example, bed toxics in NetCDF are in mg/m2 rather than mg/kg as they are in EE.

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