Improved debug output.

5-metrics.py

@@ -82,6 +82,14 @@ PHENOCAM_IMAGE_URL = (
 # ---------------------------------------------------------------------------
 
 
+def _window_mean(data: np.ndarray) -> float | None:
+    """Mean of a pixel window; ``None`` when every value is NaN."""
+    valid = data[~np.isnan(data)]
+    if valid.size == 0:
+        return None
+    return float(np.mean(valid))
+
+
 def _read_center_pixel(path: Path, lat: float, lon: float) -> float | None:
     """Return the 3×3 mean GCC value at (lat, lon) from a single-band raster.
 
@@ -103,9 +111,7 @@ def _read_center_pixel(path: Path, lat: float, lon: float) -> float | None:
         if nodata is not None:
             data = np.where(data == nodata, np.nan, data)
         data[data == 0] = np.nan
-        with np.errstate(all="ignore"):
-            val = np.nanmean(data)
-        return None if np.isnan(val) else float(val)
+        return _window_mean(data)
     except Exception:
         return None
 
@@ -334,9 +340,8 @@ def _read_multiband_center(
                 if nodata is not None:
                     data = np.where(data == nodata, np.nan, data)
                 data[data == 0] = np.nan
-                with np.errstate(all="ignore"):
-                    val = np.nanmean(data)
-                result[name] = None if np.isnan(val) else round(float(val), 6)
+                val = _window_mean(data)
+                result[name] = None if val is None else round(val, 6)
         return result
     except Exception:
         return {name: None for name in band_names}