[LandXML] Re: LandXML vertical angle clarification
- From: John Halleck <John.Halleck@xxxxxxxx>
- To: Kevin Murphy <KMURPHY@xxxxxxxxxxxxxx>
- Date: Thu, 17 Jul 2003 12:05:35 -0600 (MDT)
On Thu, 17 Jul 2003, Kevin Murphy wrote:
> Date: Thu, 17 Jul 2003 13:49:57 -0400
> From: Kevin Murphy <KMURPHY@xxxxxxxxxxxxxx>
> To: landxml@xxxxxxxxxxxxx, john.halleck@xxxxxxxx
> Cc: nathan.crews@xxxxxxxxxxxx
> Subject: [LandXML] Re: LandXML vertical angle clarification
>
> John,
> With zero directly overhead and 90 degrees on the horizon, it should
> not matter
> what side of the instrument you stand on. The horizon is always at 90
> degrees.
I realise this...
But that is not what the description says.
The description that Mr. Crews offers is in
terms of "clockwise". Which means, as a software developer,
I'm free to have the horizon -90 degrees.
Rewording it to say that it
"Represents zenith angles with the 0 origin as straight
up and measured such that the horizon is positive in the
specified Angular Units"
Would be closer to what I would expect in the official
definition.
> If you are referring to the angle if the scope of the instrument is
> inverted ( reversed),
> then the Zenith angle would be 360 - Z.
>
> hope this helped...
> -Kevin
>
>
> >>> John Halleck <John.Halleck@xxxxxxxx> 07/17/03 01:19PM >>>
> Nathan Crews says:
> "Represents zenith angles with the 0 origin as straight
> up and measured in a clockwise direction in the specified Angular
> units."
>
>
> If I change which side of the instrument I'm standing at,
> which way is clockwise for a vertical angle changes.
>
> I therefore find this confusing.
>
>
>
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