issue fix

layers/landcover/generalized.sql

@@ -82,7 +82,7 @@ CREATE TABLE osm_landcover_gen_z12 AS
         SELECT subclass,
                ST_ClusterDBSCAN(geometry, eps := 0, minpoints := 1) over () AS cid, geometry
         FROM simplify_vw_z12
-        WHERE ST_NPoints(geometry) < 300)) union_geom300b
+        WHERE ST_NPoints(geometry) < 300) union_geom300b
     GROUP BY subclass,
              cid
     UNION ALL
@@ -101,6 +101,7 @@ CREATE TABLE simplify_vw_z11 AS
 (
     SELECT subclass,
             ST_MakeValid(
+                ST_Union(
             ST_SnapToGrid(
              ST_SimplifyVW(geometry, power(zres(11),2)),
              0.001))) AS geometry

layers/landcover/merge.sql

@@ -0,0 +1,73 @@
+DROP TABLE IF EXISTS osm_landcover_gen_z0;
+DROP TABLE IF EXISTS osm_landcover_gen_z1;
+DROP TABLE IF EXISTS osm_landcover_gen_z2;
+DROP TABLE IF EXISTS osm_landcover_gen_z3;
+DROP TABLE IF EXISTS osm_landcover_gen_z4;
+DROP TABLE IF EXISTS osm_landcover_gen_z5;
+DROP TABLE IF EXISTS osm_landcover_gen_z6;
+DROP TABLE IF EXISTS osm_landcover_gen_z7;
+DROP TABLE IF EXISTS osm_landcover_gen_z8;
+DROP TABLE IF EXISTS osm_landcover_gen_z9;
+DROP TABLE IF EXISTS osm_landcover_gen_z10;
+DROP TABLE IF EXISTS osm_landcover_gen_z11;
+DROP TABLE IF EXISTS osm_landcover_gen_z12;
+DROP TABLE IF EXISTS osm_landcover_gen_z13;
+DROP TABLE IF EXISTS simplify_vw_z0 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z1 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z2 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z3 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z4 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z5 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z6 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z7 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z8 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z9 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z10 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z11 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z12 CASCADE;
+DROP TABLE IF EXISTS simplify_vw_z13 CASCADE;
+
+-- etldoc: osm_landcover_polygon ->  simplify_vw_z13
+CREATE TABLE simplify_vw_z13 AS
+(
+    SELECT subclass,
+           ST_MakeValid(
+             ST_Union(
+               ST_SnapToGrid(
+             ST_SimplifyVW(geometry, power(zres(13),2)),
+             0.001))) AS geometry
+    FROM osm_landcover_polygon
+    GROUP BY subclass
+    WHERE ST_Area(geometry) > power(zres(12),2)
+);
+CREATE INDEX ON simplify_vw_z13 USING GIST (geometry);
+
+-- etldoc: simplify_vw_z13 ->  simplify_vw_z12
+CREATE TABLE simplify_vw_z12 AS
+(
+    SELECT subclass,
+           ST_MakeValid(
+             ST_Union(
+               ST_SnapToGrid(
+             ST_SimplifyVW(geometry, power(zres(12),2)),
+             0.001))) AS geometry
+    FROM simplify_vw_z13
+    GROUP BY subclass
+    WHERE ST_Area(geometry) > power(zres(11),2)
+);
+CREATE INDEX ON simplify_vw_z12 USING GIST (geometry);
+
+-- etldoc: simplify_vw_z12 ->  simplify_vw_z11
+CREATE TABLE simplify_vw_z11 AS
+(
+    SELECT subclass,
+            ST_MakeValid(
+                ST_Union(
+            ST_SnapToGrid(
+             ST_SimplifyVW(geometry, power(zres(11),2)),
+             0.001))) AS geometry
+    FROM simplify_vw_z12
+    GROUP BY subclass
+    WHERE ST_Area(geometry) > power(zres(10),2)
+);
+CREATE INDEX ON simplify_vw_z11 USING GIST (geometry);