Re: Splitting SHOT into constituent members

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From: Richard Knapp (gyp_caver_at_yahoo.com)
Date: Wed Jan 24 2001 - 21:44:37 CET 

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From: "Richard Knapp" <gyp_caver_at_yahoo.com>
To: "cavexml_at_cartography.ch" <cavexml_at_cartography.ch>
Date: Wed, 24 Jan 2001 15:44:37 -0500 (EST)
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Subject: Re: Splitting SHOT into constituent members
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> Sorry if I've just hit a few things out of context...

Not a problem. My turn.... :-)

>> [...]
>> I guess you could ask is a shot complete by _just_ having a tape measurement?
>>An azimuth? An inclination?

> If I'm doing triangulations, the shots don't have distances.
> If I'm doing trilateralizaitons, the shots are complete with just the tape measurements.
> (And before anyone else sends me private mail, yes, I know it takes four measurements
> in three space... but it is still traditionally called a trilateraliation.)

My fault. I did not know such surveys were done in caves. Maybe this should be covered as a
type of shot (requiring certain amounts of data) so it can be properly processed. There could be
the following shot types:

        CIT (Compass, Inclinometer, Tape) requires
                - azimuth
                - inclination
                - distance

        CDT (Compass, Depth Tape)
                - azimuth
                - depth reading
                - distance

        TTT (Tape, Tape, Tape)
                - distance ^ 3

etc?

> I can point to real cave surveys that have triangulations.
> What you are saying is that I have to throw away good data that I already
> have if I want to exchange with you? :)

I have no experience processing this so I'll have to rely on the XML coordinate info you provide.
<g>

>> I guess that depends on how good the person keeping book watches what
>> occurs. I have seen 'completed' surveys with fore/backsights not even close
>> to agreeing. However, the book person didn't seem to catch it.

> Fore and back shots not agreeing is ***NOT*** necessarily an error.
> It is standard in lava tube surveys, since magnetic north varies from

In the lava tube surveys I have done, we are withing 10 degrees most of the time. However, we
are cognizant of the difference. It may be annotated as such in the notes or something to indicate
the data is not incorrect.

> I think this is a perfect example of why I want to have all the original measurments,
> and not be stuck with someone's assumptions of how this is normally done.

Granted.

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