  | Google earth accuracy |
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11-14-2009, 11:17 AM
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Silver Member
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Join Date: Aug 2008
Location: cedar rapids Iowa
Posts: 235
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Google earth accuracy
Anbody have an idea how accurate the measuring point to point on Google Earth is? At our lodge we can see deer on a neighbors posted property acrossed the valley. Can't reach that far with our range finders and we have a ongoing discussion of how far it is. Thought I would use Google Earth and their measuring system if it is accurate. Thanks
Russ
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11-14-2009, 11:21 AM
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Silver Member
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Join Date: Aug 2009
Location: NW FL... for now
Posts: 497
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Re: Google earth accuracy
The .mil uses it as an imagery source. The coordinates are very accurate, and the measuring tool is only an algorithm comparing two coordinate sets. I think it could be used to settle your debate.
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11-14-2009, 12:58 PM
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Silver Member
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Join Date: Aug 2008
Location: cedar rapids Iowa
Posts: 235
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Re: Google earth accuracy
Good, I win by 100 yds. Thanks
Russ
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11-18-2009, 10:24 PM
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Silver Member
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Join Date: Nov 2007
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Re: Google earth accuracy
The distance measurements in Google Earth are pretty accurate. Altitude measurements and the 3D depiction of terrain are limited to the accuracy of the source DEM (digital elevation models) - typically obtained from USGS and NASA. For the U.S. that should typically be DEMs that are based off a 10-meter sampling grid. Elevations may be off by 1-2 meters and anything in between sample points has to be interpolated. Still, you can come close enough for most uses.
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11-19-2009, 11:30 AM
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Silver Member
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Join Date: Sep 2009
Location: Chambersburg, PA
Posts: 203
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Re: Google earth accuracy
MapMyRun.com -
Try this link, they use google maps and you can set way points and measure the distance out or out and back. Its more of a fitness thing, but it works pretty well for distance.
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01-04-2010, 09:16 PM
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Junior Member
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Join Date: Oct 2009
Posts: 8
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Re: Google earth accuracy
Today at work my task was to map various waypoints pertinant to our line of work. I GPS'ed about 50 with no problem. I had 5 spots that I could not access due to weather and a large body of water(our bay). I thought, how bout Google Earth. Fired it up, zoomed in on my 5 targets(which are very visable from the sat), jotted down the long and lat for each site. Cool, finished. Drove out to the area to check it out, each of the 5 waypoints from Google earth missed by up to a quarter mile or so. So bad that I could actually drive to one of the sites that is 300+ feet out in the water. Kinda makes you wonder.
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01-05-2010, 01:50 PM
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Junior Member
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Join Date: Oct 2006
Posts: 22
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Re: Google earth accuracy
Quote:
Originally Posted by SWN
Today at work my task was to map various waypoints pertinant to our line of work. I GPS'ed about 50 with no problem. I had 5 spots that I could not access due to weather and a large body of water(our bay). I thought, how bout Google Earth. Fired it up, zoomed in on my 5 targets(which are very visable from the sat), jotted down the long and lat for each site. Cool, finished. Drove out to the area to check it out, each of the 5 waypoints from Google earth missed by up to a quarter mile or so. So bad that I could actually drive to one of the sites that is 300+ feet out in the water. Kinda makes you wonder.
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Verify that both your GPS and Google Earth are using the same coordinate system. I believe GE uses the WGS 84 datum.
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