This module contains functions to define a new horizontal Grid
and to get information from an existing Grid.
A Grid object is necessary to define a variable.
The following different Grid types are available:

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\begin{deflist}{{\large\tt GRID\_CURVILINEAR \ \ }}
\item[{\large\tt GRID\_GENERIC    }]  Generic user defined grid      
\item[{\large\tt GRID\_GAUSSIAN   }]  Gaussian latitude/longitude grid
\item[{\large\tt GRID\_LONLAT     }]  Equidistant longitude/latitude grid
\item[{\large\tt GRID\_LCC        }]  Lambert conformal conic grid
\item[{\large\tt GRID\_SPECTRAL   }]  Spherical harmonic coefficients
\item[{\large\tt GRID\_GME        }]  Icosahedral-hexagonal GME grid    
\item[{\large\tt GRID\_CURVILINEAR}]  Curvilinear grid
\item[{\large\tt GRID\_CELL       }]  Unstructured grid cells
\end{deflist}
\end{minipage}
