From: Julian Todd (julian_at_goatchurch.org.uk)
Date: Thu Jan 25 2001 - 18:46:21 CET
Received: (from mdom_at_localhost) by karto.ethz.ch (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) id MAA21170 for cavexml-outgoing; Fri, 26 Jan 2001 12:06:07 +0100 Received: from carbon.btinternet.com (carbon.btinternet.com [194.73.73.92]) by karto.ethz.ch (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id MAA21166 for <cavexml_at_cartography.ch>; Fri, 26 Jan 2001 12:06:06 +0100 Received: from [62.7.85.40] (helo=gordon) by carbon.btinternet.com with smtp (Exim 3.03 #83) id 14M6ho-0007G8-00 for cavexml_at_cartography.ch; Fri, 26 Jan 2001 11:06:12 +0000 Message-ID: <002601c08787$a6b776f0$0a3c10ac@gordon> From: "Julian Todd" <julian_at_goatchurch.org.uk> To: <cavexml_at_cartography.ch> References: <3A704DAE.BE810444_at_earthlink.net> Subject: Re: CaveXML>Range of Fields Date: Thu, 25 Jan 2001 17:46:21 -0000 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 Sender: owner-cavexml_at_karto.baug.ethz.ch Precedence: bulk Reply-To: cavexml_at_cartography.ch
What a big jumbled list!
Following on from my previous ramblings, I can see a total
of six different kinds of measurements:
1) Line distance (of the line segment between two points)
2) Azimuth (measured at a point: the angle of between a line and the
gravitational field)
3) Bearing (measured at a point: the horizontal angle between a line and
magnetic north)
4) Depthgauge reading (measured at a point).
5) Corner angle (measured at a point: the angle between two lines -- use a
protractor; you can do underwater surveys along a dive line with depth gauge
and ruler without the use of fiddly instruments!)
6) GPS fix (measured at a point).
Have I missed any out?
This seems like quite a small number.
Clearly, all other measurements, such as "shots" or "triangulations"
are compound groups of these.
I claim that if we were to agree on this list, and agree that it is
important,
it will cleave our XML discussion into two pieces.
The first piece is to consider each of the six measurement types
separately and list all the attributes relevant to that type -- that
means sifting through that rangeof fields.
Consider the Depthguage measurement. It has a place, value, units, time,
instrument-id and person-id.
The time (incl date) is quite an interesting attribute because the water
level can change from year to year. Other measurements are more static.
Anyways, we'd have to go through these measurement types one at a time.
The second piece is what the groups of these measurements
are collected together to form the higher level elements, such as
"shots" or cross-sections.
Personally, I don't think these higher level groupings are anything more
than a figment of our imaginations, but that's my own opinion. As
long as I can get hold of all the distinct individual measurements I
can feed them into one of those CAD Geometric Constraint solvers
and get all the point locations out.
I'll be off Email for a while, so fill my box to overflowing while I'm gone.
byeeee.
Julian Todd.
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