Formalise vocabulary for defining position of borehole elements

[denevers]

Good presentation here

https://dl.ppdm.org/dl/109

Need to formalise 'elevation', 'height' and 'depth'

[mbeaufils]

According to ISO 6709 and ISO 19111: https://www.sis.se/api/document/preview/910055/

Altitude : "height where the chosen reference surface is mean sea level"

Height : "distance of a point from a chosen reference surface measured upward along a line perpendicular to that surface"

Depth : "distance of a point from a chosen reference surface measured downward along a line perpendicular to that surface."

[denevers]

Right, We need to include this in the conceptual model as different elements in a borehole can be positionned using any of those concepts

[denevers]

Maybe this issue should be merged with Issue #21

[mbeaufils]

You mean #21 ?

[denevers]

yes, fixed it, thanks

[mbeaufils]

Agreeing first on those vocabs is not a bad idea. It would ensure that we understand the same things in #21.

[mbeaufils]

Regarding the ISO 19111 definition :

"Depth" is the opposite of "Height" and mention a reference surface.

If we agree on ISO 19111 definition, then "Depth" shall not be used to define a position along our borehole trajectory.

[denevers]

Also, depth is linear (along gravity ?). We need another word to define distance along borehole.
(in perfectly vertical boreholes, both concepts overlap)

[mbeaufils]

Yes in perfectly vertical boreholes this is the same > we shall limit to that use case :-)

+1 to have a dedicated github issue for distance along borehole

[sgrellet]

This is most of all what we end up doing in the IE (with BhML)