diff --git a/3-sentinel-data.py b/3-sentinel-data.py
index 4ed3090..f310fe1 100644
--- a/3-sentinel-data.py
+++ b/3-sentinel-data.py
@@ -667,9 +667,12 @@ def _s3_reflectance_scale(raw_s3_dir: Path) -> float:
     """Return multiplier that maps raw SYN L2 SDR values to 0–1 reflectance."""
     for path in raw_s3_dir.glob("S3*.tif"):
         with rasterio.open(path) as src:
-            mx = float(np.nanmax(src.read()))
-            if np.isfinite(mx) and mx > 5:
-                return 1.0 / S3_REFLECTANCE_SCALE
+            data = src.read()
+        if not np.any(np.isfinite(data)):
+            continue
+        mx = float(np.nanmax(data))
+        if np.isfinite(mx) and mx > 5:
+            return 1.0 / S3_REFLECTANCE_SCALE
     return 1.0
 
 
diff --git a/index.html b/index.html
index 12c68c6..e476407 100644
--- a/index.html
+++ b/index.html
@@ -758,7 +758,7 @@ function isLeap(y) { return (y%4===0 && y%100!==0) || y%400===0; }
 // ── mini map ──
 function initMiniMap(lat, lon) {
   if (!miniMapInst) {
-    miniMapInst = L.map("miniMap", { zoomControl: false, attributionControl: false, scrollWheelZoom: false })
+    miniMapInst = L.map("miniMap", { zoomControl: true, attributionControl: false, scrollWheelZoom: false })
       .addLayer(L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"));
   }
   miniMapInst.setView([lat, lon], 11);