A variable with the same name as a dimension is called a coordinate variable. Many programs that read netCDF files recognize and use any coordinate values they find.
To be useful for defining a coordinate system, a coordinate variable:
Examples of typical coordinate variables include lat, lon, level, and time, corresponding to dimensions with the same names.
The notion of coordinate variables has been generalized to
multidimensional coordinate axes and sets of coordinate axes
that comprise coordinate systems in the netCDF Java library
and the Common Data Model it supports. The CF Conventions also
provide a natural meaning for multidimensional auxiliary coordinate
variables, identified by a