[auscope-geosciml] Position along a borehole [SEC=UNCLASSIFIED]

Simon.Cox at csiro.au Simon.Cox at csiro.au
Tue Jun 28 22:37:35 EDT 2011


We can store all the downhole data in the GIS, using my recipe, as long as we record the SRS.
The only thing we can't record in the 2D GIS is the 3D survey.

Simon

From: Oliver.Raymond at ga.gov.au [mailto:Oliver.Raymond at ga.gov.au]
Sent: Wednesday, 29 June 2011 10:17 AM
To: Cox, Simon (CESRE, Kensington)
Cc: Paul.Scarponcini at bentley.com; Tan, Florence (CESRE, Kensington); Angreani, Rini (CESRE, Kensington); dsburggraf at gmail.com; auscope-geosciml at lists.arcs.org.au
Subject: RE: Position along a borehole [SEC=UNCLASSIFIED]

OK, so now I am trying to understand what kind of data does a 2D GIS store for a borehole?  Only the collar XY coordinates?  Any downhole shape information would involve a 3rd dimension, so does a 2D GIS just assume that the borehole is vertical?


________________________________
From: Simon.Cox at csiro.au [mailto:Simon.Cox at csiro.au]
Sent: Wednesday, 29 June 2011 12:11 PM
To: Raymond Oliver
Cc: Paul.Scarponcini at bentley.com; Florence.Tan at csiro.au; Rini.Angreani at csiro.au; dsburggraf at gmail.com; auscope-geosciml at lists.arcs.org.au
Subject: RE: Position along a borehole [SEC=UNCLASSIFIED]

The 2D GIS can't deliver

            <gml:posList>407829 268621 23.93 407415 268600 8.43</gml:posList>   <!-- The shape of the borehole -->
(it's 3D)

    <gml:pos>15.5</gml:pos>
(it's 1D)

My recipe solves the second problem, but not the first.

Simon

From: Oliver.Raymond at ga.gov.au [mailto:Oliver.Raymond at ga.gov.au]
Sent: Wednesday, 29 June 2011 9:56 AM
To: Cox, Simon (CESRE, Kensington)
Cc: Paul.Scarponcini at bentley.com; Tan, Florence (CESRE, Kensington); Angreani, Rini (CESRE, Kensington); dsburggraf at gmail.com; auscope-geosciml at lists.arcs.org.au
Subject: RE: Position along a borehole [SEC=UNCLASSIFIED]

What part of this (a linear reference example, but without the offset part - from section 9.3.20 of the OGC doc) can the 2D GIS systems not deliver:

<gmllr:LinearSRS gml:id="LSRS123">
    <gmllr:linearElement>
        <gml:LineString srsName="..." srsDimension="3" gml:id="LS_BH18">
            <gml:posList>407829 268621 23.93 407415 268600 8.43</gml:posList>   <!-- The shape of the borehole -->
        </gml:LineString>
    </gmllr:linearElement>
    <gmllr:lrm>
        <gmllr:LinearReferencingMethod gml:id="LRM001">
            <gmllr:name>chainage</gmllr:name>            <!--chainage = measurement in metres -->
            <gmllr:type>absolute</gmllr:type>            <!--absolute = measure from start of linear element -->
            <gmllr:units uom="m"/>
        </gmllr:LinearReferencingMethod>
    </gmllr:lrm>
</gmllr:LinearSRS>
====================================
<gml:Point gml:id="p1" srsName="#LSRS123">
    <gml:pos>15.5</gml:pos>
</gml:Point>
====================================

Cheers,
Ollie

________________________________
From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Simon.Cox at csiro.au
Sent: Wednesday, 29 June 2011 11:16 AM
To: auscope-geosciml at lists.arcs.org.au
Cc: Paul.Scarponcini at bentley.com; Florence.Tan at csiro.au; Rini.Angreani at csiro.au; dsburggraf at gmail.com
Subject: Re: [auscope-geosciml] Position along a borehole [SEC=UNCLASSIFIED]

Ollie -

The Borehole/shape should be a 3-D linestring* if available.
This may have just two points of course.
This linestring then forms the linear-element in the lateral-offset-linear-SRS, as shown in the example you've pasted into the Wiki.
This  allows subsequent references to points in the borehole to be given as 2D coordinates with the second number set to zero.

*Yes, I know there is an issue that at some stage 3D coordinates must be stored and published.
The goal is to minimize the number of times we have to use non-2D coordinates in the whole dataflow.

Simon

From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Oliver.Raymond at ga.gov.au
Sent: Wednesday, 29 June 2011 9:08 AM
To: auscope-geosciml at lists.arcs.org.au
Cc: Paul.Scarponcini at bentley.com; Tan, Florence (CESRE, Kensington); Angreani, Rini (CESRE, Kensington); dsburggraf at gmail.com
Subject: Re: [auscope-geosciml] Position along a borehole [SEC=UNCLASSIFIED]


Hi Simon et al,



I've read the OGC doc, and would just like to clarify how the 2D GIS systems represent the shape of a borehole in GSML.



ie, could you give an example from AuScope of a borehole shape from a 2D GIS system (which would then be used as the CRS for future downhole measurements):



<gsml:Borehole>

    <sa:shape>

         <what goes in here>

   </sa:shape>

</gsml:Borehole>


Thanks,
Ollie

_______________________________________________________________________

Ollie Raymond

Project Leader
National Geological Maps and Data Standards Project<http://www.ga.gov.au/minerals/projects/current-projects/geological-maps-standards.html>
Geoscience Australia

Interoperability Working Group<https://www.seegrid.csiro.au/wiki/bin/view/CGIModel/InteroperabilityWG>
IUGS Commission for the Management and Application of Geoscience Information

Address: GPO Box 378, Canberra, ACT, 2601, Australia | ABN: 80 091 799 039
Ph: +61 2 62499575  |  Fax: +61 2 62479992  |  Email: oliver.raymond at ga.gov.au<mailto:oliver.raymond at ga.gov.au>  |  Google Map<http://maps.google.com/maps?f=q&hl=en&geocode=&q=canberra+australia&ie=UTF8&ll=-35.344028,149.158362&spn=0.007684,0.016404&t=h&z=17&iwloc=addr&om=1>
_______________________________________________________________________

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-----Original Message-----
From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Simon.Cox at csiro.au
Sent: Tuesday, 28 June 2011 12:30 PM
To: auscope-geosciml at lists.arcs.org.au
Cc: Paul.Scarponcini at bentley.com; Florence.Tan at csiro.au; Rini.Angreani at csiro.au; dsburggraf at gmail.com
Subject: [auscope-geosciml] Position along a borehole/flightline



Dear GeoSciMLers



Some of the AuScope deployment team asked me about how to manage positions in boreholes.

In principle these should be specified by a single coordinate giving the offset from a datum (e.g. the collar) in a 1-D coordinate system coinciding with the borehole axis.

However, many deployments are using GIS databases which only allow for 2-D coordinates.



The suggested workaround is to use 2-D coordinates, in a Lateral Offset Linear Coordinate Reference System. The second coordinate, corresponding to the lateral offset from the linear element, can be set to 0.0 so that the position coincides with the 'linear' element (actually a curve of course).



Linear referencing is part of the v3.3 upgrade to GML currently making its way through the OGC approval process. The work on this aspect was done by Paul Scarponcini of Bentley Systems - who have an interest in infrastructure, roads, communications, cables, etc and positions relative to these, as well as David Burggraf of Galdos - who have been working with the DIGGS community who are interested in boreholes. Examples instances can be found in the GML v3.3 draft which is available on the OGC portal here:



http://portal.opengeospatial.org/files/?artifact_id=44390&version=1



Pay particular attention to Section 9.5.10 where examples of the CRS definition and direct positions using this are given.



GML 3.3 is about to go to RFC and we would expect it to be approved by OGC later in the year.



Hope this is helpful.



GeoSciMLers - can someone put this in the right place on the Wiki?

Florence - can you put this on JIRA please.



Simon





Simon Cox | Research Scientist

CSIRO Earth Science and Resource Engineering

ARRC, PO Box 1130, Bentley WA 6102, Australia

Tel +61 8 6436 8639 | Mob +61 403 302 672

simon.cox at csiro.au | http://www.csiro.au/people/Simon.Cox





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