[auscope-geosciml] GeoSciML3 Borehole Collar
Laxton, John L.
jll at bgs.ac.uk
Thu Jun 16 07:05:56 EDT 2011
I think a 1..* for CollarLocation is fine as long as it can be made absolutely unambiguous which is the elevation for the downhole log as Ollie says.
As far as the location/elevation properties are concerned my understanding was that location can accommodate a 3D point and elevation is only there if, for software reasons, it has been decided to use 2D geometry in location. So unless we are confident everyone can use a 3D point this separation would still seem to be valid.
Mapping the movement of the BoreholeCollar over time seems to be going a bit too far. The Borehole itself, and thus the original BoreholeCollar, could have a datestamp through the metadata.
From: auscope-geosciml-bounces at lists.arcs.org.au [auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Bruce.Simons at dpi.vic.gov.au [Bruce.Simons at dpi.vic.gov.au]
Sent: 16 June 2011 06:17
To: auscope-geosciml at lists.arcs.org.au
Subject: [auscope-geosciml] GeoSciML3 Borehole Collar
Mapping hydrological bores from Ballarat University and Victorian Future Farming Systems Research, and DPI's Petroleum Wells has indicated that BoreholeCollar:elevation is more complex than currently captured in GeoSciML v2. There are two issues:
1. Multiple BoreholeCollar:elevations
Petroleum Wells usually have a Kelly Bush elevation and a ground level elevation. Similarly Water wells usually have a 'natural surface' elevation and a 'top casing' elevation.
Currently GeoSciML only has an elevation property, so it is unclear which of these should be used. GroundWaterML 1 has a 'referenceElevation' to indicate the elevation other values (such as water level) relate to.
I think both referenceElevation and groundElevation should be available.
Really CollarLocation should be a 3D point, but we have split the elevation and location data for software reasons.
I think we should either have two elevation properties on BoreholeCollar, or preferably allow 1..* collarLocation with an associated role. Perhaps we should also bite the bullet and combine elevation and location into a 3D BoreholeCollar. The elevation notes state: "Compromise approach to supply elevation explictly for location; this is to allow for software that cannot process 3-D GM_Point. "
2. Some Borehole Casing height values vary with time as farmers drive over the casing, the hole is re-cased etc. I'm not sure if this happens in the mineral, engineering and petroleum industries.
A request has been made by the hydrogeologists to add a date stamp to the BoreholeCollar so these changes can be tracked.
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