From d00379af6b4e186362ba1558f1f42ae6b1b04402 Mon Sep 17 00:00:00 2001
From: Raul Ochoa <rochoaf@gmail.com>
Date: Tue, 21 Jun 2016 14:01:43 +0200
Subject: [PATCH] Pixel size query for turbo-carto adapter using radians and
 degrees instead of meters

---
 NEWS.md                                                     | 3 +++
 lib/cartodb/models/mapconfig/adapter/turbo-carto-adapter.js | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/NEWS.md b/NEWS.md
index 9d4bf4bf..8aebb7b3 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -4,6 +4,9 @@
 
 Released 2016-mm-dd
 
+Bug fixes:
+ - Pixel size query for turbo-carto adapter using radians and degrees instead of meters.
+
 New features:
  - Add support for min, max, and avg operations in aggregation dataview #513.
 
diff --git a/lib/cartodb/models/mapconfig/adapter/turbo-carto-adapter.js b/lib/cartodb/models/mapconfig/adapter/turbo-carto-adapter.js
index d838e0d5..43a3ffaa 100644
--- a/lib/cartodb/models/mapconfig/adapter/turbo-carto-adapter.js
+++ b/lib/cartodb/models/mapconfig/adapter/turbo-carto-adapter.js
@@ -50,7 +50,10 @@ var zoomTemplate = dot.template([
     '0',
     ')'
 ].join('\n'));
-var pixelSizeTemplate = dot.template('40075017 * cos(ST_Y(ST_Centroid({{=it._bbox}}))) / 2 ^ (({{=it._zoom}}) + 8)');
+// http://wiki.openstreetmap.org/wiki/Zoom_levels
+var pixelSizeTemplate = dot.template(
+    '40075017 * cos(radians(ST_Y(ST_Transform(ST_Centroid({{=it._bbox}}), 4326)))) / (2 ^ ({{=it._zoom}} + 8))'
+);
 var scaleDenominatorTemplate = dot.template('({{=it._pixelSize}} / 0.00028)::numeric');