From dcf10edd9ef8694e36b84fb8cca22d7545935ee4 Mon Sep 17 00:00:00 2001
From: antoniocarlon <antoniocarlon@gmail.com>
Date: Wed, 9 May 2018 12:29:42 +0200
Subject: [PATCH] Added tolerance for the areas

---
 src/pg/sql/45_observatory_mvt.sql | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/pg/sql/45_observatory_mvt.sql b/src/pg/sql/45_observatory_mvt.sql
index 29558ec..f4c1560 100644
--- a/src/pg/sql/45_observatory_mvt.sql
+++ b/src/pg/sql/45_observatory_mvt.sql
@@ -24,6 +24,7 @@ extent INTEGER DEFAULT 4096, buf INTEGER DEFAULT 256, clip_geom BOOLEAN DEFAULT
 RETURNS TABLE (mvt BYTEA)
 AS $$
 DECLARE
+  tolerance NUMERIC DEFAULT 100;
   bounds NUMERIC[];
   geom GEOMETRY;
   ext BOX2D;
@@ -70,7 +71,9 @@ BEGIN
                       Nullif(ST_Area(' || geom_tablename || '.' || geom_colname || '), 0)
               END pct_obs' || '
           FROM _geoms, observatory.' || geom_tablename || '
-          WHERE ST_Intersects(_geoms.geom, ' || geom_tablename || '.' || geom_colname || '))'
+          WHERE ST_Intersects(_geoms.geom, ' || geom_tablename || '.' || geom_colname || ')'
+          || ' AND ST_Area(st_intersection(' || geom_tablename || '.' || geom_colname || ', _geoms.geom)) > ST_Area($1) / $6 '
+          || ')'
       AS procgeom_clause
     FROM _meta
     GROUP BY api_method, geom_tablename, geom_geomref_colname, geom_colname
@@ -215,7 +218,7 @@ BEGIN
             String_Agg(procgeom_clauses, E',\n       '),
             String_Agg(val_clauses, E',\n       '),
             json_clause)
-  USING geom, ext, extent, buf, clip_geom;
+  USING geom, ext, extent, buf, clip_geom, tolerance;
   RETURN;
 
 END