Change zoom precision function

This changes the number of fractional digits to log10(pixels / degrees) with pixels = 2**(8 + zoom) and degrees = 180.
openstreetmap · Aug 17, 2024 · 1951ed2 · 1951ed2
1 parent 9b2db63
commit 1951ed2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/app/assets/javascripts/osm.js.erb b/app/assets/javascripts/osm.js.erb
@@ -204,7 +204,9 @@ OSM = {
   },
 
   zoomPrecision: function(zoom) {
-    return Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+    var pixels = Math.pow(2, 8 + zoom);
+    var degrees = 180;
+    return Math.ceil(Math.log10(pixels / degrees));
   },
 
   locationCookie: function(map) {