Commons-NetCDF

The Commons-NetCDF Library a thin layer on top of the UCAR unidata NetCDF Java library that allows users simplest to define NetCDF structures on builder chaining pattern without check dimensions, variables and attributes relationship, and writing data to the NetCDF file.

The Commons-NetCDF Library comes in two flavors.

• The JRE flavor requires JDK 1.8 or higher.
• The UCAR unidata NetCDF Java library flavor requires 4.6.10 or higher.

Examples

Builder

Please have a look at the fully examples: Unit test DEMO

Basic usage:

 NetCDFBuilder.create( new File( "src/test/resources/test.nc" ).getPath())
    .addGlobalAttribute( GlobalAttribute.CONVENTIONS, "CF-1.6")
    .addGlobalAttribute( GlobalAttribute.TITLE, "Test Data")
    .addDimension( DimensionName.TIME, 10)
    .addDimension( DimensionName.Y, 10)
    .addDimension( DimensionName.X, 10)
    .addVariable( VariableName.TIME, DataType.DOUBLE, DimensionName.TIME )
    .addVariableAttribute( VariableName.TIME, VariableAttribute.KEY_NAME, "time")
    .addVariableAttribute( VariableName.TIME, VariableAttribute.KEY_UNITS, VariableAttribute.UNITS_TIME)
    .addVariableAttribute( VariableName.TIME, VariableAttribute.KEY_AXIS, VariableAttribute.AXIS_TIME)
    .addVariable( VariableName.Y, DataType.DOUBLE, DimensionName.Y )
    .addVariableAttribute( VariableName.Y, VariableAttribute.KEY_NAME, VariableAttribute.COORDINATES_Y_WGS84)
    .addVariableAttribute( VariableName.Y, VariableAttribute.KEY_UNITS, VariableAttribute.UNITS_Y_WGS84)
    .addVariableAttribute( VariableName.Y, VariableAttribute.KEY_AXIS, VariableAttribute.AXIS_Y)
    .addVariable( VariableName.X, DataType.DOUBLE, DimensionName.X )
    .addVariableAttribute( VariableName.X, VariableAttribute.KEY_NAME, VariableAttribute.COORDINATES_X_WGS84)
    .addVariableAttribute( VariableName.X, VariableAttribute.KEY_UNITS, VariableAttribute.UNITS_X_WGS84)
    .addVariableAttribute( VariableName.X, VariableAttribute.KEY_AXIS, VariableAttribute.AXIS_X)
    .addVariable("rainfall", DataType.FLOAT, DimensionName.TIME, DimensionName.Y, DimensionName.X )
    .addVariableAttribute("rainfall", VariableAttribute.KEY_NAME_LONG, "Rainfall")
    .addVariableAttribute("rainfall", VariableAttribute.KEY_UNITS, "mm")
    .build() // Finished NetCDF file structures define mode
    .writeValues( VariableName.TIME, this.valueMap.get( DimensionName.TIME ))
    .writeValues( VariableName.Y, this.valueMap.get( DimensionName.Y ))
    .writeValues( VariableName.X, this.valueMap.get( DimensionName.X ))
    .writeValues("rainfall", this.valueMap.get("rainfall"))
    .close(); // close IO

Reader

Please have a look at the fully examples: Unit test DEMO

Basic usage:

try ( NetCDFReader reader = NetCDFReader.read( "src/test/resources/QPESUMS_QPE.nc" ); ){
	reader.findDimension( "time" ).ifPresent( dimension -> {
		// To do with dimension
	});
}

License

• The Commons-NetCDF Library are licensed under the Apache License, Version 2.0

Authors and Contributors

The Commons-Java libraries are developed by the FondUS Technology Co., Ltd. and are maintained by @Vipcube.