GENIE Gridspec Diagrams VerticalCoordSystem

A vertical coordinate system provides a description of the vertical coordinates used by a grid tile, and may include the coordinates themselves. Coordinates are specified using an "axis" and are encoded in a similar way to the NcML "values" element -- either every coordinate can be listed, or a start value and offset given for periodic coordinates. "point_indices" and "edge_indices" are used in a similar way to indicate which coordinates refer to cell edges, and which to grid points.

The vertical coordinate system has two sub-types, "mass_based_type" and "space_based_type", which can be used to give more information about the vertical coordinates; the latter is shown below.