[Qgis-user] Drill hole section with QGIS 3

[C Hamilton]

Thanks everyone for the explanation. It looks like there is a lot of
interest. I had wondered if this was something that I could work on, but I
see that it would take more time than I have, although it seems like a real
fun project and I hope you can get the support for this.

Best wishes,

Calvin

On Thu, Mar 15, 2018 at 10:00 AM, Ramon Andinach <custard at westnet.com.au>
wrote:

> Hi Calvin,
>
> In geology, we use a set of drill holes into the ground to interpret the
> space in the earth between them. Depending on what the geologist is
> interested in, we might be plotting the location of an aquifer, or a gold
> seam, an oil reservoir or some other feature. Note here, that I’m
> deliberately picking things that have length, breath and depth, so just
> interpolating a surface is not the same thing.
>
> So, things that you might want to be able to do include:
>  display attributes of the drill hole on a string representing the drill
> hole (or drill trace) in real 3D space.
>  Create slices (sections) of these drill traces (so depth is the right and
> left side), with windows of included data on either side of the slice.
>  Draw polygons snapped to the drill trace to link areas with similar
> features between holes.
>  Build a mesh/wireframe model that links the polygons together
>  Get a volume of said model
>  Create a voxel model of an attribute/s distribution within the mesh.
>
> This is probably a slightly economic geology skewed view, but hopefully
> I’ve left enough geo-jargon out that it’s understandable[1]
>
> Depends on how complex you want to be. A well known GIS package in my neck
> of the woods trumpets the ability to do the slice and dice and section bit,
> but really it’s making up non-earth plans and dressing them up as having
> proper depth (a section). For some people that seems enough.
> But - that sort of approach makes it really difficult if what you’d really
> like to do is show just the bits of the drill holes with say, gold grades
> greater that 20g/t - leaving any other result as transparent - and spin it
> slowly around in 3D so that you can get a sense of the go/d’s distribution
> pattern. This last one is much more complex and only possible if you’re
> working in a truly 3D environment.
>
> Hope that makes some sort of sense. Feel free to ask for clarification.
>
> Ramon.
> [1] I’ve made an attempt to swap out terms I’m used to using for more
> generic explanations or more comp sci friendly terms. Hopefully, mostly
> understandable to both sides now.
>
>
>
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