From: martinl_at_talk21.com
Date: Thu Feb 08 2001 - 18:11:52 CET
Received: (from mdom_at_localhost) by karto.ethz.ch (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) id SAA31628 for cavexml-outgoing; Thu, 8 Feb 2001 18:14:29 +0100 Received: from t21mta01-app.talk21.com (mta01.talk21.com [62.172.192.171]) by karto.ethz.ch (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id SAA31624 for <cavexml_at_cartography.ch>; Thu, 8 Feb 2001 18:14:28 +0100 From: martinl_at_talk21.com Received: from t21mtaV-lrs ([10.216.84.20]) by t21mta01-app.talk21.com (InterMail vM.4.01.02.27 201-229-119-110) with SMTP id <20010208171314.YGEN20154.t21mta01-app.talk21.com_at_t21mtaV-lrs>; Thu, 8 Feb 2001 17:13:14 +0000 X-Mailer: talk21 v1.17 - http://www.talk21.com To: cavexml_at_cartography.ch, cavexml_at_cartography.ch X-Talk21Ref: none Date: Thu, 8 Feb 2001 17:11:52 GMT Subject: Re:Groupings Message-Id: <20010208171314.YGEN20154.t21mta01-app.talk21.com@t21mtaV-lrs> Sender: owner-cavexml_at_karto.baug.ethz.ch Precedence: bulk Reply-To: cavexml_at_cartography.ch
> On Thu, 8 Feb 2001 Roger Schuster wrote:
>There are not only diving data which are different from the common distance
>- bearing - inclination stuff, there are also some other methods for
>recording survey data. Theodolite surveys for example or the Topofil which
>is popular in France.
>
John Halleck has now given us an outline of the Theodolite/levelling format and its difference from the diving format. What does a Topofil give you? I guess it is used to give you an distance from start of survey (as used for an extended elevation) rather than a leg distance at each station plus forward bearing and inclination to next station.
>I think processed data shouldn't interchanged because each software
>processes data in its own way. You could take the same surveying data from a
>looped cave and enter them into CaveRender, Compass and Survex and print the
>map in exactly the same scale. Each of the three maps will look a little bit
>different because of different loop closure technique.
>
This sounds like a good reason for passing processed data so that results can be compared between different processors. If the loop closure techniques result in grossly different answers it would be good to know why! I think John Halleck's website has some thoughts about this...
However, the main reason for passing processed data must be so that the recipients don't need to do any survey processing if they just want to do something with the coordinate data - load it into a CAD package; put it into a 3D modeller; analyse passage levels; print the data out; use it as a source of random numbers; whatever...
For a proof-of-concept example of how it could be used to draw a survey line using SVG via an XSLT transformation see
http://www.laverty.freeserve.co.uk/XML/KML.htm and follow the 2D drawings link. There's lots more there too..
Martin
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