EEMS provides access to a number of online data sources that can be used to automatically populate time series. These should be used with care, and we do not guarantee the quality of the data. Access to this feature is provided from the Tools menu, and selecting Download Online Data. There are three sub-options: Model Open Boundary Conditions, Tidal Level for Model Boundaries, and Tidal Harmonics for Station as shown in Figure 1.
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- Water surface elevation
- Water salinity
- Water temperature
The data source of water surface elevation is from HYCOM Global Surface Data. Water salinity and water temperature are from the Navy Global Hybrid Coordinate Ocean Model (HYCOM). These data sources are present in the *.ini file in the EEMS OnlineData folder (e.g., C:\Program Files\DSI\EEMS11.6\OnlineData). These files can be opened and edited with a text editor.
In the case of a model that has an existing open boundary, open the 2DH View, turn on the light in the Boundaries layer of the Layer Control to show the boundaries of the model as shown in Figure 2. This displays the locations of the open boundary.
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Boundary: click the drop-down arrow; , and the boundaries will showbe displayed; select a boundary for which we want to download data
Data Type: click the drop-down arrow; data types will show and will include water surface elevation, water salinity, and water temperature
Data Set: This is the data source
List of Boundary Grid Cells: It shows all cells in the selected boundary. Each cell has an I and J index
Dataset Information: This is general information about the dataset. These fields of this frame are non-editable.
Begin: This is the beginning time of available data
End: This is the ending time of available data. The Begin and End are updated after clicking the Get Times button.
Base Date
Interval (hours): This is the frequency of data collection
#: This is is the number of data records
Download Options
Time Begin: This is the starting time
Time End: This is the ending timethese . These two fields are editable; enter the Time Begin and Time End must be within the time frame (Begin and End) of Dataset Information.
Merge with Existing Series: This option will update the downloaded data to the existing boundary data series.
Replace Existing Series:This option will replace current boundary will replace the current boundary data series with new downloaded data series.
Separated Series for Each Cell:This option will will create a time series for each boundary cell and name it using the I and J indices of the cell.
Time Zone: Most of global data are based on time on time zone 0 (UTC). There forTherefore, you need to must provide the correct time zone as the number of hours shifted from UTC for you your model.
Get Data: Once we complete fields and options in the Download Options frame, click the Get Data button to start downloading data, and after that, we will see the message "Download data is ready. Click OK button to apply". Now click the OK button to apply the downloaded data to the cells.
If you click the Cancel button, it will terminate and close the form.
Tidal Level for Model Boundaries
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Update: When we change information of the selected cell (e.g., longitude or latitude), then click the Update button to update the information of the cell.
Time Shift (hours): The phase lag of the harmonic constants is referred to as zero UTC, so it may be necessary to shift the time to adjust for the model's local time.
The online data source for the harmonic constants can be selected from the Data Set drop-down list. Currently, there is only one data set for the harmonic constants from HAMTIDE model with the grid resolution of 7.5 arc minutes for 8 eight tidal constituents of Mof M2, S2, N2, K2, K1, O1, Q1, P1. More data sources for tidal harmonic constants will be added in the future. These tidal These tidal harmonic constants will be used to generate time series of water surface elevation at model boundary cells using the same approach as the Generate from Harmonics Option for water level forcing data.
Get Data: Once everything is ready, click the Get Data button to download the harmonic data. EE will populate a table of fields, including ID, Name, Speed, Amplitude, and Phase, as shown in Figure 6. The OK button will now be enabled. Click the OK button so that the tidal time series of the selected three cells are added to Water Level in External Forcings Data. These time series can be used to assign to open boundaries when needed.
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Tidal Harmonics for Station
In some cases, we have station coordinates and want to get the harmonic constants for that station. The steps described below will allow us to do this.
Go to Tools menu, then select Download Online Data / Tidal Harmonics for Station, the form of Download Online Data for Open Boundaries will be displayed as Figure 10. Enter the station information into the form as Name (e.g., Station_01), Longitude, and Latitude, and then click the Add button to add the station into the List of Locations as shown in Figure 11.
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