CHATHAMS IMPORTED: 29/4 --Glen
HB: mainland UPLOADED 2010-12-15 in changeset 6662772
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http://wiki.openstreetmap.org/wiki/Proposed_features/reef
http://wiki.openstreetmap.org/wiki/Tag:sub_sea%3Dreef
?
? layer="-1"
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RP: i think we only use layer=-1 for things underground
i would agree to using sub_sea=reef and natural=reef until one is approved
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HB: added test for type==0.0; now looks good to me
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HB 22 Aug 2012: updated to match new linz data release field names.