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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@unb.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                                        |
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