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
altitude        | n_grid_points     | Altitude      | float-32

