[MDAL-Developer] Volume intrepretation

[Paul Harwood]

Hello all

Another question for you. I am looking at an app that converts from
MDAL DataOnVolume dataset to a voxel-based representation.

That should not be particularly difficult. However, it has made apparent
that it is not particularly clear what the "Vertical Levels" data in
MDAL actually means.

My first understanding - that since the data values are volumetric the
"vertical levels" represent the centroid of the volume being measured - is
slightly undermined by the fact that there are (face count + volume count)
values in the array which is too many for that interpretation.

The size of the array suggests that the interpretation should be one of
layered meshes and the volumes are the spaces between the layers. That is
fair enough but there is only one value per extruded face cell - when it is
clear that the extruded face cell is not necessarily parallel to anything
else. Is this vale then the vertical level of the centroid extruded face
cell?

Does anyone have a definitive answer?
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