add visvalingam.sql

II/Referatas/visvalingam.sql

@@ -0,0 +1,14 @@
+DROP TABLE IF EXISTS visvalingam_:tolerance;
+
+CREATE TABLE visvalingam_:tolerance (
+    fid serial NOT NULL,
+    geom geometry(MULTILINESTRING, 3346)
+);
+
+INSERT INTO visvalingam_:tolerance (geom) (
+    SELECT
+        ST_SimplifyVW (ST_LineMerge (ST_Union (geom)),
+            :tolerance * :tolerance) AS geoms
+    FROM
+        zeimena);
+