diff --git a/next.config.js b/next.config.js
index 4247713..41f8c66 100644
--- a/next.config.js
+++ b/next.config.js
@@ -49,9 +49,9 @@ const nextConfig = {
               "default-src 'self'",
               "script-src 'self' 'unsafe-inline' 'unsafe-eval' blob:",
               "style-src 'self' 'unsafe-inline'",
-              "img-src 'self' data: blob: https://*.tile.openstreetmap.org https://api.maptiler.com http://localhost:9000 http://minio:9000",
+              "img-src 'self' data: blob: https://*.tile.openstreetmap.org https://api.maptiler.com https://server.arcgisonline.com https://wmts.geo.admin.ch https://wmts0.geo.admin.ch https://wmts1.geo.admin.ch https://wmts2.geo.admin.ch https://wmts3.geo.admin.ch https://wmts4.geo.admin.ch http://localhost:9000 http://minio:9000",
               "font-src 'self' data:",
-              "connect-src 'self' ws: wss: https://api.maptiler.com https://*.tile.openstreetmap.org https://api.open-meteo.com",
+              "connect-src 'self' ws: wss: https://api.maptiler.com https://*.tile.openstreetmap.org https://api.open-meteo.com https://server.arcgisonline.com https://wmts.geo.admin.ch https://wmts0.geo.admin.ch https://wmts1.geo.admin.ch https://wmts2.geo.admin.ch https://wmts3.geo.admin.ch https://wmts4.geo.admin.ch",
               "frame-ancestors 'self'",
               "base-uri 'self'",
               "form-action 'self'",
diff --git a/src/components/map/map-view.tsx b/src/components/map/map-view.tsx
index f6fd80a..e077293 100644
--- a/src/components/map/map-view.tsx
+++ b/src/components/map/map-view.tsx
@@ -106,7 +106,7 @@ export function MapView({
   const measureMarkersRef = useRef<maplibregl.Marker[]>([])
   const measureCoordsRef = useRef<number[][]>([])
   const [isMapLoaded, setIsMapLoaded] = useState(false)
-  const [isSatellite, setIsSatellite] = useState(false)
+  const [activeBaseLayer, setActiveBaseLayer] = useState<'osm' | 'satellite' | 'swisstopo' | 'swissimage'>('osm')
   const [measurePointCount, setMeasurePointCount] = useState(0)
   const [measureFinished, setMeasureFinished] = useState(false)
   const [drawingPointCount, setDrawingPointCount] = useState(0)
@@ -689,6 +689,24 @@ export function MapView({
             attribution: '© Esri, Maxar, Earthstar Geographics',
             maxzoom: 19,
           },
+          'swisstopo': {
+            type: 'raster',
+            tiles: [
+              'https://wmts.geo.admin.ch/1.0.0/ch.swisstopo.pixelkarte-farbe/default/current/3857/{z}/{x}/{y}.jpeg',
+            ],
+            tileSize: 256,
+            attribution: '© swisstopo',
+            maxzoom: 18,
+          },
+          'swissimage': {
+            type: 'raster',
+            tiles: [
+              'https://wmts.geo.admin.ch/1.0.0/ch.swisstopo.swissimage/default/current/3857/{z}/{x}/{y}.jpeg',
+            ],
+            tileSize: 256,
+            attribution: '© swisstopo SWISSIMAGE',
+            maxzoom: 20,
+          },
         },
         layers: [
           {
@@ -702,6 +720,18 @@ export function MapView({
             source: 'satellite',
             layout: { visibility: 'none' },
           },
+          {
+            id: 'swisstopo',
+            type: 'raster',
+            source: 'swisstopo',
+            layout: { visibility: 'none' },
+          },
+          {
+            id: 'swissimage',
+            type: 'raster',
+            source: 'swissimage',
+            layout: { visibility: 'none' },
+          },
         ],
       },
       center: [initialCenter.lng, initialCenter.lat],
@@ -2109,28 +2139,38 @@ export function MapView({
         </>
       )}
 
-      {/* Layer toggle: OSM / Satellite */}
+      {/* Layer toggle: cycle through base maps */}
       <button
         onClick={() => {
           if (!map.current) return
-          const newSat = !isSatellite
-          setIsSatellite(newSat)
-          map.current.setLayoutProperty('osm', 'visibility', newSat ? 'none' : 'visible')
-          map.current.setLayoutProperty('satellite', 'visibility', newSat ? 'visible' : 'none')
+          const layers: Array<'osm' | 'satellite' | 'swisstopo' | 'swissimage'> = ['osm', 'satellite', 'swisstopo', 'swissimage']
+          const currentIdx = layers.indexOf(activeBaseLayer)
+          const nextLayer = layers[(currentIdx + 1) % layers.length]
+          for (const l of layers) {
+            map.current.setLayoutProperty(l, 'visibility', l === nextLayer ? 'visible' : 'none')
+          }
+          setActiveBaseLayer(nextLayer)
         }}
         className="absolute top-3 right-3 z-10 flex items-center gap-1.5 px-2.5 py-1.5 rounded-lg text-xs font-semibold shadow-lg border transition-colors"
         style={{
-          background: isSatellite ? 'rgba(0,0,0,0.7)' : 'rgba(255,255,255,0.95)',
-          color: isSatellite ? '#fff' : '#333',
-          borderColor: isSatellite ? 'rgba(255,255,255,0.3)' : 'rgba(0,0,0,0.15)',
+          background: activeBaseLayer !== 'osm' ? 'rgba(0,0,0,0.7)' : 'rgba(255,255,255,0.95)',
+          color: activeBaseLayer !== 'osm' ? '#fff' : '#333',
+          borderColor: activeBaseLayer !== 'osm' ? 'rgba(255,255,255,0.3)' : 'rgba(0,0,0,0.15)',
         }}
-        title={isSatellite ? 'Zur Kartenansicht wechseln' : 'Zur Satellitenansicht wechseln'}
+        title="Kartenstil wechseln"
       >
-        {isSatellite ? (
-          <><svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="M3 7l6-3 6 3 6-3v13l-6 3-6-3-6 3z"/><path d="M9 4v13"/><path d="M15 7v13"/></svg>Karte</>
-        ) : (
+        {activeBaseLayer === 'osm' && (
           <><svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><circle cx="12" cy="12" r="10"/><path d="M12 2a14.5 14.5 0 0 0 0 20 14.5 14.5 0 0 0 0-20"/><path d="M2 12h20"/></svg>Satellit</>
         )}
+        {activeBaseLayer === 'satellite' && (
+          <><svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="M3 7l6-3 6 3 6-3v13l-6 3-6-3-6 3z"/><path d="M9 4v13"/><path d="M15 7v13"/></svg>Swisstopo</>
+        )}
+        {activeBaseLayer === 'swisstopo' && (
+          <><svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><circle cx="12" cy="12" r="10"/><path d="M12 2a14.5 14.5 0 0 0 0 20 14.5 14.5 0 0 0 0-20"/><path d="M2 12h20"/></svg>Luftbild CH</>
+        )}
+        {activeBaseLayer === 'swissimage' && (
+          <><svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="M3 7l6-3 6 3 6-3v13l-6 3-6-3-6 3z"/><path d="M9 4v13"/><path d="M15 7v13"/></svg>OSM</>
+        )}
       </button>
 
       {/* Zeichnung abschliessen Button (Linie/Polygon/Pfeil) */}