Dimensions
----------
n_grid_points = Data_Block->N_Grid_Points

Variables
---------
export-name         | dimension_names   | original_name     | data_type

grid_point_id       | n_grid_points     | Grid_Point_ID     | unsignedInteger-32
lat                 | n_grid_points     | Latitude          | float-32
lon                 | n_grid_points     | Longitude         | float-32
equiv_ftprt_diam    | n_grid_points     | Equiv_ftprt_diam  | float-32

