Thread: Google maps and its accuracy

  1. #1
    Registered User ssharish2005's Avatar
    Join Date
    Sep 2005
    Cambridge, UK

    Question Google maps and its accuracy

    Hi all.

    Im not sure if you can help understand GPS and mapping system.
    I have question on GPS coordinates. Perhaps this is basic question, however I wanted to clarify.

    How accurate are google maps? I use a tool to retriever GPS coordinate from the following
    Google Maps - Find GPS coordinates, longitude, latitude, altitude

    The tools allows me to get a GPS coordinate for any given point. However what im not sure of is how accurate are these coordinate. Do you know how accurate these maps? Or is there a way to findout/calculate etc? If google maps weren’t accurate maps, do you know a map which I can use to get somewhat accurate coordinates?

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  2. #2
    Make Fortran great again
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    Sep 2009
    You don't need that website to get the lat/lon, you can get that directly from the google maps site. I'm not sure how accurate it is. If you're going off their satellite imagery I wouldn't count on it to be more accurate than 10 ft. You can look into OpenStreetMap , you might be able to get accuracy information from them.

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    It depends on what you mean by "accurate".

    In modern usage, when you tell someone (who isn't a professional navigator or cartographer) a latlong position, the implicit assumption is that they're telling you GPS coordinates. From that, you implicitly know where 0"0'N,0"0'E is, and hence every other point can be assigned a unique LL coordinate.

    But where 0"0'N,0"0'E is varies depending on your frame of reference. GPS uses WGS84 for example.
    World Geodetic System - Wikipedia

    If google maps gives you a latlong position, and you tell someone else that position, then they will land up in the same place.
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  4. #4
    Android geek@02's Avatar
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    Mar 2004
    Kurunegala Colony, Sri Lanka, Sri Lanka
    Quote Originally Posted by Epy View Post
    If you're going off their satellite imagery I wouldn't count on it to be more accurate than 10 ft.
    Yeah, when I look for where i'm sitting, it pinpoints the location to like 6 meters away. Still pretty neat, i would say.
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