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. NetCDF Setting.
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Then, the user can select which parameters they want to output from the water column or the sediment bed. by checking the box in Output Parameters frame, Users can now select more detailed components when writing to a NetCDF file Some options for the sediment bed are not yet enabled and will be added to EE in future releases.
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The basic steps involve selecting the ArcToolbox > Multidimensional Tools > Make NetCDF Feature Layer
Figure 2. ArcGIS reading the NetCDF file.
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To demonstrate the netCDF output is consistent with the data viewed in EE, a number of comparisons have been made for different models. Examples of an output from the West Lake WQ model in EE, ArcGIS, and ncWMS are shown in Figure 3 240419309, Figure 4 and Figure 5 respectively. Note that the West Lake model may be downloaded from the EE website.
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