LatLng64
The LatLng64 is a 64-bit structure that compactly contains latitude and longitude data with an accuracy of ±2.8 mm.
This format is great for geographic databases. Occupies half the space of traditional solutions
and provides accuracy sufficient for the vast majority of applications.
Features
- The structure occupies 64 bits of memory and uses them to the maximum.
- In the populated part of the Earth, the accuracy is no worse than ±2.8 mm.
- In the polar regions of the Earth, the accuracy is no worse than ±5.6 mm.
- The restored latitude and longitude values have a neat decimal form.
Comparison with other formats
- The Float32 pair has different precision depending on the location. Step up to 1.7 m is unacceptable for most applications.
- The Float64 pair is the traditional solution. But it takes up a huge 128 bits and gives meaningless sub-nanometer precision.
- The Int32 pair can give uniform accuracy of ±5.6 mm. This is still twice as bad as
LatLng64.