Re: GPS Trail measurements
Reynolds, Nikki (jakar@aiinc.com)
Fri, 17 Jan 1997 19:48:28 -0800
ROBERT J MORRIS wrote:
>
> -- [ From: ROBERT J MORRIS * EMC.Ver #2.5.02 ] --
>
> Jim Mitchell/Gary Fend
>
> You are both correct in a way and at the same time you are both misinformed.
> (not wrong but misinformed)
>
> The data must be gathered and a process called "differential correction"
> applied. Differential correction takes the data gathered by a "base station"
> at a known location and compares it to the "rover" or field data and makes
> the corrections to abberitions caused in part by atmospheric conditions and
> to militarily induced misinformation(this last is to be removed soon)
>
> The stated maximum deviation of +/- 100 meters is from any one location
> recorded and not accumulative. Of greater importance in GPS work is the fact
> that the necessary satellites are not always available 24 hours a day in
> every location. Planning on when to do your data acquisition is very
> important! You do not want to be out there and find you can't do your work.
> (of course you can just ride and come back another day and get the trail
> mapped)
>
> Hey you guys are having me hold a class on GPS in an endurance forum. MY
> apologies Steph, but they press my buttons and I spout.
>
> Bob Morris
> Morris Endurance Enterprises
> Boise, ID
Hi Bob,
You have my vote to keep holding class. I never knew such a thing
existed until reading your messages. It does apply to endurance and
there's no harm in learning more about trail measurement devices. It
adds some variety to our "everyday conversations". -Nikki