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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. It should be noted that while the display order of some dimensions (i.e. TIME, KC, CELL) in *.nc output files exported from EFDC+ Explorer may differ from that obtained directly from EFDC+, the values of variables are not impacted and retrieved correctly with reference to their descriptive data.

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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Info
titleNote
  • After running the model, the user must 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. 
  • 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.

  • When extracting results from NetCDF file, users should take care regarding the L cell index. The loop of the cell list in EFDC+ starts from L = 2 (i.e. corresponding to the first active cell), while with tools used to extract data from NetCDF, such as Python or Matlab, start the loop from 0 or 1, respectively.

Displaying NetCDF Output

There are a number of options available to the user for displaying netCDF output, such as using ArcGIS, or using web-based tools such as ncWMS. Some of these are outlined here to help the user to become familiar with these tools.

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