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If I have a device how give-me a latitude and longitude with 7 decimals (eg. -42.5124478, -22.3006726, longitude and latitude respectively ) and I round it to 4 decimals (eg. -42.5124, -22.3007).

It represents +-0.0001 of possible precision error.

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The point is, imagining about a Earth a perfect sphere, I want to know what max limits from rounded decimals in Earth Surface according of rounding (based on this metric answered here Measuring accuracy of latitude and longitude?

how much dislocation of surface area it will represents? and how to calculate it?

LeonanCarvalho
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    This will depend on the latitude of your area of interest. A degree (or a fraction of it) represents a larger distance near the Equator than near the Poles – GISGe Jul 28 '16 at 13:25
  • This has been answered in depth already, e.g. in https://gis.stackexchange.com/questions/8650/how-to-measure-the-accuracy-of-latitude-and-longitude – bugmenot123 Jul 28 '16 at 13:53
  • Yes, but not so depth enough.

    I think it's not a duplicate question, its totally different than about know "how much is latitude in meters" or "How to measure the accuracy of latitude and longitude?"

    The point is, imagining about a Earth a perfect sphere, I want to know what max limits from rounded decimals (for this i make a example of rounding of 7 to 4 degrees ) in Earth Surface. It's possible? The other questions that you mark as duplicate or suggest me doesn't answer my question.

     – LeonanCarvalho Jul 28 '16 at 18:09
  • Your device is likely giving you more precision than what its true accuracy is. From the linked Q&A, 4th decimal place, 11 m approximately and that's calculated from 1 degree = 111 km at the equator. – mkennedy Jul 28 '16 at 20:48
  • @mkennedy The device could be anything (eg. UAV or UCAV) and may are using a DGPS to provide a best accurancy . A combined distortion of lat and lng +- 0.0001 could be fatal. – LeonanCarvalho Jul 28 '16 at 20:57

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