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- The variables must have exactly 3 dimensions: time,y,x (rectangular) or time,row,col(non-rectangular),
- The order of the dimensions is fixed and should also be time,y,x or time,row,col,
- The time-dimension is identified by its units-atribute. The units value must be a string formatted as per recommendations in the Udunits package. The name time is recommended but others name like date or t are also allowed,
- All dimensions have the axis-attribute which indicates which axis is defined with this dimension. For the time-axis the attribute should always be T. For the row- and y-dimension this attribute is Y. For the col- and x-dimension this attribute is X.
- Missing values can be indicated by using the _FillValue attribute or the missing_value attribute,
- Packaging of data is supported by defining an add_offset and/or a scale_factor for a variabele.
- The internal parameterids should be mapped to a name which is compliant with the CF metadata convention in the idmap-files,
- Per file only one time-variable, or x (col)- and y(row)-variable is allowed.
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- Rectangular grids have 3 dimensions time,y,x. All the dimension are 1D. The y- and x-dimension must have the same geodatum as defined in the configuration (grids.xml).
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The information from this page has been moved to the new page NetCDF formats that can be imported in Delft-FEWS.