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Overview

This export is available in DELFT-FEWS versions 2022.02 (RWS) and later

Tidal wave data on the north sea which has been analyzed to determine wave heights and assign standardized wave numbers can be stored in a specific NetCDF format where the upper and lower water levels are referenced by wave numbers replacing time as dimension and time stamps per wave number and location are stored separately. 

Exports data to NetCDF files which comply to the CF 1.4 standard.

To indicate that data values are missing , NetCDF-CF exports use float value 9.96921e+036 by default. It is possible to change it by entering a different missing value (NaN or other) in the configuration files. Use option <exportMissingValue> in TimeSeriesExport module, and <missVal> in GeneralAdapter
More information about the cf standards can be found at: http://cfconventions.org/Data/cf-standard-names/current/build/cf-standard-name-table.html

Configuring the export

An example of the NETCDF-TIDAL_TIMESERIES export is given here.

Since 2021.02 it is also possible to import NETCDF attributes into FEWS and save them as timeSeriesProperty. You can see a config example for that here: NETCDF-CF_GRID

ExportNetcdf_Timeseries 1.00 default.xml
<?xml version="1.0" encoding="UTF-8"?>
<timeSeriesExportRun xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews
http://fews.wldelft.nl/schemas/version1.0/timeSeriesExportRun.xsd">
	<export>
		<general>
			<exportType>NETCDF-CF_TIMESERIES</exportType>
			<folder>%REGION_HOME%/Export/netcdf/0D</folder>
			<exportFileName>
				<name>.nc</name>
				<prefix>
					<timeZeroFormattingString>yyyyMMddHHmm</timeZeroFormattingString>
				</prefix>
			</exportFileName>
			<idMapId>IdExportNetCDF</idMapId>
			<exportMissingValueString>-999</exportMissingValueString>
			<exportTimeZone>
				<timeZoneName>GMT</timeZoneName>
			</exportTimeZone>
		</general>
		<properties>
			<string key="timeseriesproperty:rivieren1" value='netcdfattribute:discharge_forcing_id'/>
			<string key="timeseriesproperty:rivieren2" value='netcdfattribute:systemid '/>
		</properties>
		<timeSeriesSet>
			<moduleInstanceId>ExportNetcdf_Timeseries</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>Q.udm</parameterId>
			<locationSetId>DMFlowPoints</locationSetId>
			<timeSeriesType>simulated historical</timeSeriesType>
			<timeStep unit="nonequidistant"/>
			<relativeViewPeriod unit="day" start="-365" end="365"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</export>
</timeSeriesExportRun>

An example of the IdMapping used for the NETCDF-CF_TIMESERIES export will be given below. In this example, the mapped locations correspond to the locations of the locatiesSet as defined above in the ExportNetcdf_Timeseries.xml.

IdExportNetCDF 1.00 default.xml
<?xml version="1.0" encoding="UTF-8"?>
<idMap version="1.1" xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews http://fews.wldelft.nl/schemas/version1.0/idMap.xsd">
	<parameter internal="Q.udm" external="discharge" externalQualifier1="discharge (not standardname, just for test)"/>

	<location internal="DMTak_1001" external="1001"/>
	<location internal="DMTak_1002" external="1002"/>
	<location internal="DMTak_1003" external="1003"/>
	<location internal="DMTak_1004" external="1004"/>
	...
	<location internal="DMTak_6115" external="6115"/>
</idMap>

NetCDF standard names

If the parameter has an entry in the standard name CF table, you can enter this standard name to the parameters.xml file. The value of this standardName element will be added as the standard_name attribute for this variable in the exported netcdf file.

IdExportNetCDF 1.00 default.xml
<parameter id="P.obs" name="Observed Rainfall">
        <shortName>P.obs</shortName>
        <standardName>precipitation_amount</standardName>
</parameter>
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