From 5e65ac8c521e122d8634f666358b9ad51a49749c Mon Sep 17 00:00:00 2001
From: zstadler <zeev.stadler@gmail.com>
Date: Tue, 9 Jun 2020 11:53:18 +0300
Subject: [PATCH] Add area-base filtering for park names in lower zoom levels
 (#911)

Resolve https://github.com/openmaptiles/openmaptiles/issues/776

Thanks @zstadler for this PR.
---
 layers/park/layer.sql | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/layers/park/layer.sql b/layers/park/layer.sql
index 71157b9..bf2929a 100644
--- a/layers/park/layer.sql
+++ b/layers/park/layer.sql
@@ -198,6 +198,7 @@ FROM (
                   FROM osm_park_polygon_gen8
                   WHERE zoom_level = 6
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen7 -> layer_park:z7
@@ -214,6 +215,7 @@ FROM (
                   FROM osm_park_polygon_gen7
                   WHERE zoom_level = 7
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen6 -> layer_park:z8
@@ -230,6 +232,7 @@ FROM (
                   FROM osm_park_polygon_gen6
                   WHERE zoom_level = 8
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen5 -> layer_park:z9
@@ -246,6 +249,7 @@ FROM (
                   FROM osm_park_polygon_gen5
                   WHERE zoom_level = 9
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen4 -> layer_park:z10
@@ -262,6 +266,7 @@ FROM (
                   FROM osm_park_polygon_gen4
                   WHERE zoom_level = 10
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen3 -> layer_park:z11
@@ -278,6 +283,7 @@ FROM (
                   FROM osm_park_polygon_gen3
                   WHERE zoom_level = 11
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen2 -> layer_park:z12
@@ -294,6 +300,7 @@ FROM (
                   FROM osm_park_polygon_gen2
                   WHERE zoom_level = 12
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon_gen1 -> layer_park:z13
@@ -310,6 +317,7 @@ FROM (
                   FROM osm_park_polygon_gen1
                   WHERE zoom_level = 13
                     AND geometry_point && bbox
+                    AND area > 70000*2^(20-zoom_level)
                   UNION ALL
 
                   -- etldoc: osm_park_polygon -> layer_park:z14