Created
December 26, 2019 18:10
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Natural Earth oceans 2163
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| select st_difference(st_expand(st_envelope(geom), 100), geom) from | |
| (select st_unaryunion(st_transform(st_union(geom), 2163)::geometry(geometry, 2163)) as geom from ne_50m_land) sq; |
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unary union is needed to fix invalidity in Antarctica after transform:
This is the only polygon that becomes invalid on transformation (at 50m, at least)