[Seavox] Vertical CRS

[Roy Lowry]

Dear All,

I am about to embark on setting up some vocabularies to support vertical co-ordinate reference systems.  The first stage - needed for a number of purposes - is to set up a series of terms for vertical CRS datums appropriate to conventional distance measurements (Lowest Astronomical Tide and so on), which I'll circulate for comment in the next week or so.  

I'm also thinking about sibling lists for other units that are going through the ISO acceptance process like pressure and density.  Any suggestions for populating these are welcome.

Given these, simple vocabularies for directionality (e.g. height is up, depth is down), vertical CRS names and units (BODC-biased version already there, but something like UDUNITS might be more acceptable) provides the basis in the Vocabulary Server for a vertical CRS ontology based on RDF triples like:

Depth measuredIn metres
Depth datumIs mean_sea_level
Depth directionIs down

Any comments on how this could be improved within the constraints of the vocabulary server design would be welcomed.

Cheers, Roy.