Add OSM topography

package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "earcut": "^3.0.1",
+        "geo-three": "^0.1.15",
         "next": "15.2.1",
         "proj4": "^2.15.0",
         "react": "^19.0.0",
@@ -20,6 +21,7 @@
         "@tailwindcss/postcss": "^4.0.11",
         "@types/earcut": "^3.0.0",
         "@types/node": "^22",
+        "@types/proj4": "^2.5.6",
         "@types/react": "^19",
         "@types/react-dom": "^19",
         "@types/three": "^0.174.0",
@@ -1047,6 +1049,12 @@
         "undici-types": "~6.20.0"
       }
     },
+    "node_modules/@types/proj4": {
+      "version": "2.5.6",
+      "resolved": "https://registry.npmjs.org/@types/proj4/-/proj4-2.5.6.tgz",
+      "integrity": "sha512-zfMrPy9fx+8DchqM0kIUGeu2tTVB5ApO1KGAYcSGFS8GoqRIkyL41xq2yCx/iV3sOLzo7v4hEgViSLTiPI1L0w==",
+      "dev": true
+    },
     "node_modules/@types/react": {
       "version": "19.0.10",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.0.10.tgz",
@@ -2714,6 +2722,14 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/geo-three": {
+      "version": "0.1.15",
+      "resolved": "https://registry.npmjs.org/geo-three/-/geo-three-0.1.15.tgz",
+      "integrity": "sha512-mU5K5QfnRwOawTjXg1zmAMTu+c/uC6cZFNGYqf41eCRXfX4bkDHFaPhXa08z1WjYzg5kq1BSjpFR9weW2vNJZg==",
+      "peerDependencies": {
+        "three": ">0.120.0"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.3.0.tgz",