[Qgis-user] Drill hole section with QGIS 3

[Richard Duivenvoorde]

For those needing 3D features, may I draw your attention to the
crowd-funding call of Lutra:

https://www.lutraconsulting.co.uk/crowdfunding/more-qgis-3d/

@lutra/sabel: you probably/maybe can pick some idea's from this thread
to do?

Regards,

Richard Duivenvoorde



On 15-03-18 15:00, Ramon Andinach 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.
> 
> 
>> On 15 Mar 2018, at 20:31, C Hamilton <adenaculture at gmail.com
>> <mailto:adenaculture at gmail.com>> wrote:
>>
>> Pardon my ignorance on the matter, but what does a drill hole
>> capability mean? Is it simply making a hole in a polygon or is it much
>> more complex.
>>
>> Thanks,
>>
>> Calvin
>>
>> On Wed, Mar 14, 2018 at 3:46 PM, John Harrop <jcharrop at gmail.com
>> <mailto:jcharrop at gmail.com>> wrote:
>>
>>     It looks like no one has been answering this for you yet and I’m
>>     just catching up on a few days emails after my computer was in the
>>     shop.
>>
>>     There is active interest in developing a drill hole plugin for
>>     QGIS3 now that 3D is more fully supported.  I also work with drill
>>     holes and have been running them in QGIS fairly easily in plan
>>     view where I just calculate traces to a plan view (either in a
>>     spreadsheet or using code) and apply theme patterns based on the
>>     attributes I kept with the segments.  This has worked reasonable
>>     well with grade and lithology which are two of the main things you
>>     want to see.
>>
>>     Cross sections have been harder, but those are still “maps” in
>>     non-Earth coordinates.  Again I’ve tended to build those with
>>     projections to a plane in either a spreadsheet or by code.  This
>>     is not as easy to work with as plan view so I am very interested
>>     in seeing the developing interest in getting a drill hole section
>>     plugin for QGIS.  That will really finalize QGIS as the logical
>>     choice for geological exploration work.
>>
>>     I’ve cc’ed the others I know using QGIS so I hope you can be
>>     included in the list of interested users.
>>
>>     Regards,
>>
>>     John Harrop, PGeo, FGS
>>     Senior Project Geologist
>>     Coast Mountain Geological Ltd
>>
>>     PO Box 62
>>     Suite 488 - 625 Howe St
>>     Vancouver, BC   V6C 2T6
>>
>>
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