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    Re: Dip-meter again
    From: Bruce J. Pennino
    Date: 2013 Apr 10, 16:37 -0400
    Hello Richard and All:
    Thinking about this a bit more. I was going to measure  starting  at 1,000 ft between two points. Measure on the ground to 800, 600, 400, 200 and 100 ft. I assume that % error will increase at shorter distances.  Then compare my true lengths to the google scaled lengths.  I seldom scale anything less than 200 ft or so. I'll start looking for a good place where there are numerous overhead visible objects at somewhat regular intervals.

    ----- Original Message -----
    Sent: Wednesday, April 10, 2013 1:35 PM
    Subject: [NavList] Re: Dip-meter again

    Depending on how you use it, Google Earth images might not give results better than 1 metre but that might be sufficient. I used a Google Earth image to measure the distance between (the centres of) two GNSS antennas on the roof of Head Hall. The GNSS-determined baseline length is 19.010 metres. An initial determination using the Google Earth image gave 19.49 metres. Zooming OUT and remeasuring gave 19.18 metres.
    -- Richard Langley
    On 2013-04-10, at 2:10 PM, Bruce J. Pennino wrote:
    > Absolutely brilliant and simple! Why didn't I think of that? I scale distances frequently from online maps/charts. Just yesterday I had to do a quicky estimate for an elevated "high line" of bridges and walkways. I measured 200 ft with a tape, and the guesstimated the length would be 1200 ft. I'm going to go back to the site with my tape. Measure it more accurately and compare it to Google earth. Your idea also offers a simple way to check other measurements. I like it.
    > Bruce
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    | Richard B. Langley                            E-mail: lang---ca         |
    | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
    | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
    | University of New Brunswick                   Fax:      +1 506 453-4943   |
    | Fredericton, N.B., Canada  E3B 5A3                                        |
    |        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |

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