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 <mad...@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: mad...@email.unc.edu > https://scottmadry.web.unc.edu > Skype: scott madry > > > On Mar 15, 2018, at 10:00 AM, Ramon Andinach <cust...@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 <adenacult...@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 <jchar...@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@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@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@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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