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I have some data with GPS coordinates with upto 9 decimal points. Example of this is
39.1234567891 -75.1987654321
I need to process this data to get a context of where the person is. But I want to treat the coordinates encompassed within 100m as a single location for simplicity. Can anyone point to any reference that would indicate how many decimal points I should round off to get to this level of accuracy.
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Together with the previous app GPS/Glonass coordinates is one of the most accurate and often chosen apps by hikers or long distance travellers who explore remote areas.
GPS: Maps uses satellites to know your location up to around 20 meters. When you're inside buildings or underground, the GPS is sometimes inaccurate.
GPS satellites and positioning: one satelliteIt takes four GPS satellites to calculate a precise location on the Earth using the Global Positioning System: three to determine a position on the Earth, and one to adjust for the error in the receiver's clock.
Due to various error sources, standard GPS yields position measurements accurate to approximately 10 meters. Differential GPS (DGPS), which enhances the system through a network of fixed, ground-based reference stations, has improved accuracy to about one meter.
9 digits is too detailed for any but a long term geodetic app.
6 digits is in centimeter range, and usually the most accurate what makes sense for a GPS device.
At equator 4 digits after decimal point is 11.11m.
3 digits are 111.11m
(Calculated by earthCircumference / 360.0)
This would normally result a raster, but since Earth is a sphere, the distance between two longitudes shrinks when moving away from the equator (with a factor of cos(latitude)) the distance between two latitudes does not change.
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