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add Bertold's description about the file names.

https://github.com/BertoldVdb/ZoneDetect/issues/43#issuecomment-1917285937
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Jan-Piet Mens 2024-01-30 16:53:27 +01:00 committed by GitHub
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@ -10,3 +10,5 @@ To use the builder, first install [shapelib](https://github.com/OSGeo/shapelib),
This will create database files in `out` and `out_v1`, as well as a `db.zip` containing both directories.
The files in the folder out\_v1/ use a newer format and use less space to encode the same information.
The numbers in on the file names indicate the resolution. The `*21` file has a higher resolution for storing the borders, but it is larger. The `*16` file has a longitude resolution of 0.0055 degrees (~0.5km) and the `*21` file has 0.00017 degrees (~20m)