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Re: Distance Measurement - Tape vs Google
From: Bruce J. Pennino
Date: 2013 Apr 11, 23:21 -0400

Hi:

My intent was to show everyone and myself that Google Maps Distance Calculator is just excellent for all distances starting at even 100 ft or 200 ft. The precision/accuracy increases so that at 500, 1000 ft or more vertical angular measurements achieve very reasonable precision with devices other than a theodolite.

With a channel width of over 500 ft, I'm still curious to reconcile the HoE difference of 22.5 ft and 15 ft. Which is the more correct value? I believe that was in Gary's posting....but now I'm unsure of which message. Sorry, sometimes I lose track of the original message in a discussion..

Bruce

----- Original Message -----

From: Brad Morris

To: bpennino.ce@charter.net

Sent: Thursday, April 11, 2013 9:05 PM

Subject: [NavList] Re: Distance Measurement - Tape vs Google

Hi Bruce Gary LaPook wanted a very long baseline with the bubble sextant measured angle to improve the accuracy of his HoE, in his "Dip Meter Again" post. I think that's one of the reasons why he did it that way, using Google earth. You can use a lesser distance because of the greater angular precision of your theodolite. Hence the 200' restriction of your tape isn't a restriction! Nicely done. The bubble sextant, of course, cannot really compete with a theodolite for angular measure and thus HoE determination at a distance of 200'. Note that a larger population of bubble sextant owners are in the audience than theodolite owners. So for the benefit of those who have one and not the other, using a long baseline helps when determining HoE by bubble sextant. Brad ---------------------------------------------------------------- NavList message boards and member settings: www.fer3.com/NavList Members may optionally receive posts by email. To cancel email delivery, send a message to NoMail[at]fer3.com ----------------------------------------------------------------

View and reply to this message: http://fer3.com/arc/m2.aspx?i=123531

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