10 lines
471 B
SQL
10 lines
471 B
SQL
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WITH zoom AS ( select generate_series(0,2) as Z ),
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range AS ( select z, generate_series(0, pow(2,z)::int-1) as r FROM zoom),
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inp AS ( select z0.z, r1.r as x, r2.r as y FROM zoom z0, range r1, range r2 WHERE z0.z = r1.z and r1.z = r2.z ),
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ext AS ( select x,y,z,CDB_XYZ_Extent(x,y,z) as g from inp )
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select X::text || ',' || Y::text || ',' || Z::text as xyz,
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round(st_xmin(g)), round(st_xmax(g)), round(st_ymin(g)), round(st_ymax(g))
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from ext order by xyz;
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