[Qgis-user] Drill hole section with QGIS 3

Thu Mar 15 11:57:51 PDT 2018

In the past, I've was hoping to make a QGIS plugin to do Liquefaction
<https://en.wikipedia.org/wiki/Soil_liquefaction>Analysis .  This analysis
uses a borehole database, ground motion grids, and historical high ground
water grids.  What prevented me from doing it was that QGIS Relations can
not work with composite keys <https://issues.qgis.org/issues/9531>.  So, I
hope that any work on getting QGIS to work with boreholes would address
this problem.

-Bob

On Thu, Mar 15, 2018 at 7:20 AM, Madry, Scott <madrys at email.unc.edu> wrote:

> This is also of interest to the archaeological community, in terms of 3-D
> representations of excavations, soil strata, location of artifacts, etc.
> GRASS has Voxel capabilities that allow this, but additional tools like
> this would be of interest to archaeologists.
>
> Regards,
>
> Scott Madry
>
> Scott Madry, Ph.D.
> Research Associate Professor of Archaeology
> The University of North Carolina at Chapel Hill
>
> Tel         1-919-448-4493 <(919)%20448-4493>
> Email:    madrys at email.unc.edu
> https://scottmadry.web.unc.edu
> Skype:   scott madry
>
>
> On Mar 15, 2018, at 10:00 AM, Ramon Andinach <custard at westnet.com.au>
> wrote:
>
> This sender failed our fraud detection checks and may not
> be who they appear to be. Learn about spoofing
> <http://aka.ms/LearnAboutSpoofing>
> Feedback <http://aka.ms/SafetyTipsFeedback>
> 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> 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> 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
>>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20180315/03ac6d7c/attachment.html>