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1. Cover Area (Regional, or Global)

If code is regional or limited, code length could be shorter than global code or one covers wider area, because amount of information needed is smaller. If you are looking for a code that covers only one country, there should be simpler and smaller code available. However, if you need global code, your code must be longer and more complicated than regional code.
For example, “MapCode®” covers only Land area in Japan to decrease information amount needed. So, it only needs 10 digits of numbers. If you try to cover global area with numeric code, it needs 15 digits code for 1x1 meter accuracy.