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Exports data to NetCDF files which comply to the CF 1.6 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/
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An example of the NETCDF-CF_GRID export will be given here.
In FEWS, it is possible to couple time series with pre-configured properties. From 2021.02 the properties can be exported to the NETCDF file as NETCDF attributes. See a config example bellow. Using the example, the name of the NETCDF attribute will be systemid, the value will be the value of timeSeriesProperty with the name rivieren2, that belongs to the exported time series.
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 formats that can be imported in Delft-FEWS
Since 2023.02 it is possible to change the name of the Z variable, which defaults to "height above mean sea level" to a (long) name of your choice using the custom property "Z_LONG_NAME" as demonstrated in the example below.
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<?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_GRID</exportType> <folder>%REGION_HOME%/Export/netcdf/2D</folder> <exportFileName> <name>.nc</name> <prefix> <timeZeroFormattingString>yyyyMMddHHmm</timeZeroFormattingString> </prefix> </exportFileName> <idMapId>IdExportNetCDF</idMapId> <exportMissingValueString>-9999.0</exportMissingValueString> </general> <properties> <string key="timeseriesproperty:rivieren2" value='netcdfattribute:systemid '/> <string key="Z_LONG_NAME" value="elevation"/> </properties> <timeSeriesSet> <moduleInstanceId>ExportNetcdf_Grid</moduleInstanceId> <valueType>grid</valueType> <parameterId>G.umf</parameterId> <locationId>NHI_H_L001</locationId> <timeSeriesType>simulated historical</timeSeriesType> <timeStep unit="day" multiplier="1"/> <relativeViewPeriod unit="day" start="-7" end="3"/> <readWriteMode>add originals</readWriteMode> </timeSeriesSet> </export> </timeSeriesExportRun> |
Some additional properties can be configured concernings the netcdf export format. Like for writing compressed netcdf Exportmodule-properties.
An example fo the IdMapping used for the NETCDF-CF_GRID export is shown below.
If the parameter has an entry in the standard name CF table, you can enter it in the externalQualifier1 attribute of the parameter. The value of this qualifier will be added as the standard_name attribute for this variable in the netcdf exported file.
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