You can actually store a coordinate accurate to about 1 meter in a single long value (32 bits each axis). This can be an important saving if you are indexing a lot of locations. Think of the long value as pointing to a block of earth at any degree of accuracy you want. You can then query for all entities that are in the same 1KM block or 10KM block using a normal query which you cannot do if you store two floats.
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