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The accuracy of Google Maps has been consistently tweaked by their staff
since it rolled out some years ago. The corrections have been somewhat
aided by 3-D projection of the imagery over terrain models (where you
might see a "waterfall" that looks like a "river" if they are not
aligned correctly) and also significantly improved by user reports and
other projects such as OpenStreetMap.org.

I would expect you to find some areas which are significantly (an order
of magnitude) more accurate than other less-frequented areas.

--Robert


David Pike wrote:
>
> One thing this discussion shows is how remarkably accurate the lat and long 
readout on Google maps, which is presumably tied to WGS84, can be.  If you 
look for ‘Greenwich Park London’ and then go to Earth and go to maximum 
enlargement, you can actually see the stainless steel Prime Meridian line.  
Place the marker over it and select left click.  You’ll get 51,477881, 
-0.001502.  Multiply that by 3600 and you’ll get a longitude of 5.41”W.  
Thrilled by this I thought I’d enter the figures I posted earlier in the 
week.  The marker comes about a yard away from the little white table I sat 
my GPS on, which shows my GPS was considerably more accurate at that instant 
than the figure it was suggesting.  You’re correct Gary.  You can see where I 
live.  What’s it like in other parts of the World?  Dave
>

   

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