From ee012ae2daad463d539d0d376b1474001b602fcb Mon Sep 17 00:00:00 2001
From: karenzshea <karenzshea@gmail.com>
Date: Wed, 12 Oct 2016 09:54:09 -0400
Subject: [PATCH] valid tiles are >= z12

---
 include/engine/api/tile_parameters.hpp | 3 ++-
 src/engine/plugins/tile.cpp            | 3 +--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/engine/api/tile_parameters.hpp b/include/engine/api/tile_parameters.hpp
index 34c949a89..728beede7 100644
--- a/include/engine/api/tile_parameters.hpp
+++ b/include/engine/api/tile_parameters.hpp
@@ -64,7 +64,8 @@ struct TileParameters final
         // https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#X_and_Y
         const auto valid_x = x <= static_cast<unsigned>(std::pow(2., z)) - 1;
         const auto valid_y = y <= static_cast<unsigned>(std::pow(2., z)) - 1;
-        const auto valid_z = z < 20;
+        // zoom limits are due to slippy map and server performance limits
+        const auto valid_z = z < 20 && z >= 12;
 
         return valid_x && valid_y && valid_z;
     };
diff --git a/src/engine/plugins/tile.cpp b/src/engine/plugins/tile.cpp
index 2f483e49e..e79a015dc 100644
--- a/src/engine/plugins/tile.cpp
+++ b/src/engine/plugins/tile.cpp
@@ -372,8 +372,7 @@ Status TilePlugin::HandleRequest(const std::shared_ptr<datafacade::BaseDataFacad
     };
 
     // If we're zooming into 16 or higher, include turn data.  Why?  Because turns make the map
-    // really
-    // cramped, so we don't bother including the data for tiles that span a large area.
+    // really cramped, so we don't bother including the data for tiles that span a large area.
     if (parameters.z >= MIN_ZOOM_FOR_TURNS)
     {
         // Struct to hold info on all the EdgeBasedNodes that are visible in our tile