diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index d4f2de0..2ad500b 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -205,8 +205,8 @@ var FRAG_SRC = [
         'vec2 gUv = vec2(hitPoint.x, hitPoint.z);',
         'gUv = (gUv - uGroundCenter) / uGroundSize + 0.5;',
         'vec3 groundCol = texture2D(uGround, gUv).rgb;',
-        'float fogAmount = clamp(tGround / 30.0, 0.0, 1.0);',
-        'groundCol = mix(groundCol, uBg, fogAmount * 0.75);',
+        'float fogAmount = clamp(tGround / 12.0, 0.0, 1.0);',
+        'groundCol = mix(groundCol, uBg, fogAmount);',
         // Ground mask: full ground when looking down, none when up.
         'float gmask = (tGround > 0.0) ? smoothstep(0.0, -0.30, rd.y) : 0.0;',
         'col = mix(col, groundCol, gmask);',
@@ -269,7 +269,7 @@ function init(canvas) {
 var GROUND_TILE_URL = 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/';
 var GROUND_TILE_Z = 11;
 var GROUND_TILE_SIZE = 256;
-var GROUND_MOSAIC_SIZE = 9;     // 9x9 tiles around the camera
+var GROUND_MOSAIC_SIZE = 16;    // 16x16 tiles around the camera
 var GROUND_BUFFER_TILES = 2;     // refetch when this close to edge
 // Passau tile at zoom 11
 var GROUND_BASE_X = 1102;