From: Alexander Nickolsky (nickol_at_argussoft.ru)
Date: Fri Jul 19 2002 - 14:47:27 CEST
Return-Path: <owner-cavexml-outgoing_at_ethz.ch> Delivered-To: cavexml-archive_at_cartography.ch Received: from localhost (localhost [127.0.0.1]) by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0) with ESMTP id 5841E15912 for <cavexml-outgoing_at_ethz.ch>; Fri, 19 Jul 2002 15:04:23 +0200 (CEST) Received: by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0, from userid 28) id 3259515876; Fri, 19 Jul 2002 15:04:21 +0200 (CEST) Delivered-To: cavexml-loopcheck_at_ethz.ch Received: from localhost (localhost [127.0.0.1]) by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0) with ESMTP id 290F115912 for <cavexml-loopcheck_at_ethz.ch>; Fri, 19 Jul 2002 15:04:20 +0200 (CEST) Received: by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0, from userid 96) id 0AB9514A46; Fri, 19 Jul 2002 15:04:18 +0200 (CEST) Delivered-To: cavexml_at_cartography.ch Received: from localhost (localhost [127.0.0.1]) by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0) with ESMTP id C2B5815912 for <cavexml_at_cartography.ch>; Fri, 19 Jul 2002 15:04:17 +0200 (CEST) Received: from ns.argussoft.ru (ns.argussoft.ru [195.7.171.132]) by karmail.ethz.ch (Postfix on SuSE eMail Server 2.0) with ESMTP id 341F38A96 for <cavexml_at_cartography.ch>; Fri, 19 Jul 2002 15:04:15 +0200 (CEST) Received: from cachet (cachet.argussoft.ru [195.7.171.199]) by ns.argussoft.ru (8.9.1/8.9.1) with SMTP id PAA21130 for <cavexml_at_cartography.ch>; Fri, 19 Jul 2002 15:44:21 +0300 (MSK) Message-ID: <003a01c22f22$70191240$c7ab07c3@argussoft.ru> From: "Alexander Nickolsky" <nickol_at_argussoft.ru> To: <cavexml_at_cartography.ch> References: <5.1.0.14.1.20020719160945.01d513c0_at_popa.melbpc.org.au> Subject: Re: Data model : branches and nodes Date: Fri, 19 Jul 2002 16:47:27 +0400 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Loop: cavexml Sender: owner-cavexml_at_karmail.ethz.ch Precedence: bulk Reply-To: cavexml_at_cartography.ch X-Virus-Scanned: by AMaViS perl-11
>
> I have included the concepts of Node, Branch and Spur because some people
> use them when manipulating survey data, e.g. for some methods of loop
> closure analysis. For example a single Branch could replace a whole string
> of non-bifurcating Legs/Shots. If your work did not involve using
Branches,
> etc, then you would ignore those entities completely. However because our
> CaveXML standard has to allow for all users and their needs if it is to be
> accepted, then I feel we need to consider them in the overall scheme. But
> no one is forced to use them. We can discuss the issue in detail when we
> come to them.
>
I know this, but I think that this format can not reflect all possible loop
closing
methods. Moreover, I think that the data format should not support any.
There are many methods of statistical data processing for each data set.
If a program needs Branches, it should construct them. There are no
branches in original survey data, nor in the final plot. We can not predict
all intermediate data structures that will be invented in next 10 years.
Another issue is that introducing these entities causes data duplication,
and this is not a good practice.
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