@mytec: iter2 tested, added heatmapfix task

RFCP-Heatmap-Fix.md

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+# RFCP Heatmap Fix - Zoom-Dependent Intensity
+
+## Problem
+At close zoom (12-15), heatmap becomes solid yellow/orange with no gradient visible.
+
+## Root Cause
+The `intensity` values and `max` parameter aren't scaling properly with zoom level, causing saturation.
+
+## Solution
+
+### File: `frontend/src/components/map/Heatmap.tsx`
+
+Replace the current implementation with this improved version:
+
+```typescript
+import { useEffect, useState } from 'react';
+import { useMap } from 'react-leaflet';
+import { HeatmapLayerFactory } from '@vgrid/react-leaflet-heatmap-layer';
+
+const HeatmapLayer = HeatmapLayerFactory<[number, number, number]>();
+
+interface HeatmapProps {
+  points: Array<{
+    lat: number;
+    lon: number;
+    rsrp: number;
+    siteId: string;
+  }>;
+  visible: boolean;
+}
+
+export function Heatmap({ points, visible }: HeatmapProps) {
+  const map = useMap();
+  const [mapZoom, setMapZoom] = useState(map.getZoom());
+  
+  useEffect(() => {
+    const handleZoomEnd = () => {
+      setMapZoom(map.getZoom());
+    };
+    
+    map.on('zoomend', handleZoomEnd);
+    return () => {
+      map.off('zoomend', handleZoomEnd);
+    };
+  }, [map]);
+  
+  if (!visible || points.length === 0) {
+    return null;
+  }
+  
+  // Zoom-dependent heatmap parameters
+  const getHeatmapParams = (zoom: number) => {
+    // Radius scales inversely with zoom
+    // zoom 6 (country): radius=40, blur=20
+    // zoom 10 (region): radius=28, blur=14
+    // zoom 14 (city): radius=16, blur=10
+    // zoom 18 (street): radius=8, blur=6
+    const radius = Math.max(8, Math.min(40, 50 - zoom * 2.5));
+    const blur = Math.max(6, Math.min(20, 30 - zoom * 1.5));
+    
+    // Max intensity also scales with zoom
+    // Lower zoom (zoomed out) = higher max (more spread)
+    // Higher zoom (zoomed in) = lower max (more detail)
+    const maxIntensity = Math.max(0.3, Math.min(1.0, 1.2 - zoom * 0.05));
+    
+    return { radius, blur, maxIntensity };
+  };
+  
+  const { radius, blur, maxIntensity } = getHeatmapParams(mapZoom);
+  
+  // Normalize RSRP to 0-1 intensity
+  // RSRP ranges: -120 (very weak) to -70 (excellent)
+  const normalizeRSRP = (rsrp: number): number => {
+    const minRSRP = -120;
+    const maxRSRP = -70;
+    const normalized = (rsrp - minRSRP) / (maxRSRP - minRSRP);
+    return Math.max(0, Math.min(1, normalized));
+  };
+  
+  // Convert points to heatmap format: [lat, lon, intensity]
+  const heatmapPoints = points.map(point => [
+    point.lat,
+    point.lon,
+    normalizeRSRP(point.rsrp)
+  ] as [number, number, number]);
+  
+  return (
+    <HeatmapLayer
+      points={heatmapPoints}
+      longitudeExtractor={(p) => p[1]}
+      latitudeExtractor={(p) => p[0]}
+      intensityExtractor={(p) => p[2]}
+      gradient={{
+        0.0: '#0d47a1',  // Dark Blue (very weak)
+        0.2: '#00bcd4',  // Cyan (weak)
+        0.4: '#4caf50',  // Green (fair)
+        0.6: '#ffeb3b',  // Yellow (good)
+        0.8: '#ff9800',  // Orange (strong)
+        1.0: '#f44336',  // Red (excellent)
+      }}
+      radius={radius}
+      blur={blur}
+      max={maxIntensity}  // ← KEY FIX: dynamic max
+      minOpacity={0.3}
+    />
+  );
+}
+```
+
+## Key Changes
+
+1. **Dynamic `max` parameter**: 
+   ```typescript
+   const maxIntensity = Math.max(0.3, Math.min(1.0, 1.2 - zoom * 0.05));
+   ```
+   - Zoom 6: max = 0.9 (spread out, needs higher threshold)
+   - Zoom 12: max = 0.6 (medium detail)
+   - Zoom 18: max = 0.3 (tight detail, lower threshold)
+
+2. **Better RSRP normalization**:
+   ```typescript
+   const normalized = (rsrp - minRSRP) / (maxRSRP - minRSRP);
+   ```
+   - Ensures full 0-1 range is used
+   - Maps -120 dBm → 0.0 (blue)
+   - Maps -70 dBm → 1.0 (red)
+
+3. **Clearer variable names** and comments
+
+## Testing
+
+After applying this fix:
+
+1. **Zoom out (level 6-8)**: Should see smooth gradient, larger blob
+2. **Zoom medium (level 10-12)**: Clear color transitions
+3. **Zoom close (level 14-16)**: Should still show gradient, not solid color
+4. **Very close (level 18+)**: Small detailed dots with gradient
+
+## If Still Solid at Close Zoom
+
+Try adjusting the `maxIntensity` formula:
+
+```typescript
+// More aggressive scaling (lower max at high zoom)
+const maxIntensity = Math.max(0.2, Math.min(1.0, 1.5 - zoom * 0.08));
+
+// Or even more aggressive
+const maxIntensity = Math.max(0.15, Math.min(1.0, 2.0 - zoom * 0.1));
+```
+
+This will make the gradient more visible at close zoom levels.