How Precisely Should You Store Latitude and Longitude:
The precision of latitude and longitude storage depends on the desired accuracy of location representation. To determine the appropriate storage format, consider the following factors:
Accuracy Requirements:
You aim to maintain an accuracy of within 50 feet from the actual location.
Decimal Point Impact:
Each decimal point increases precision by one order of magnitude. For example:
Equation to Calculate Decimal Places:
To determine the number of decimal places needed for a specific accuracy, use the following equation:
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Calculating for 50 Feet Accuracy:
Given an accuracy requirement of 50 feet, the equation becomes:
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This value indicates that you need approximately 4 decimal places to store the latitude and longitude with an accuracy of within 50 feet.
Recommendation:
For most applications where accuracy within a few meters is sufficient, storing latitude and longitude with 3-4 decimal places is a good balance between precision and storage efficiency. This level of precision corresponds to an accuracy of approximately 1.11 meters (3.67 feet).
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