new branch

backend/app/api/v1/visualization.py

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+"""Visualization API - GeoJSON endpoints for 3D Earth display"""
+
+from fastapi import APIRouter, HTTPException
+import httpx
+
+router = APIRouter()
+
+CABLE_DATA_URL = "https://services.arcgis.com/6DIQcwlPy8knb6sg/arcgis/rest/services/SubmarineCables/FeatureServer/2/query?where=1%3D1&outFields=*&returnGeometry=true&f=geojson"
+LANDING_POINT_CSV_URL = "https://data.apps.fao.org/catalog/dataset/1b75ff21-92f2-4b96-9b7b-98e8aa65ad5d/resource/b6071077-d1d4-4e97-aa00-42e902847c87/download/landing-point-geo.csv"
+
+
+@router.get("/geo/cables")
+async def get_cables_geojson():
+    """获取海底电缆 GeoJSON 数据 (LineString)"""
+    try:
+        async with httpx.AsyncClient(timeout=60.0) as client:
+            response = await client.get(CABLE_DATA_URL)
+            response.raise_for_status()
+            return response.json()
+    except httpx.HTTPError as e:
+        raise HTTPException(status_code=502, detail=f"Failed to fetch cable data: {str(e)}")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Internal error: {str(e)}")
+
+
+@router.get("/geo/landing-points")
+async def get_landing_points_geojson():
+    """获取登陆点 GeoJSON 数据 (Point)"""
+    try:
+        async with httpx.AsyncClient(timeout=60.0) as client:
+            response = await client.get(LANDING_POINT_CSV_URL)
+            response.raise_for_status()
+
+            lines = response.text.strip().split("\n")
+            if not lines:
+                raise HTTPException(status_code=500, detail="Empty CSV data")
+
+            features = []
+            for line in lines[1:]:
+                if not line.strip():
+                    continue
+                parts = line.split(",")
+                if len(parts) >= 4:
+                    try:
+                        lon = float(parts[0])
+                        lat = float(parts[1])
+                        feature_id = parts[2]
+                        name = parts[3].strip('"')
+                        is_tbd = parts[4].strip() == "true" if len(parts) > 4 else False
+
+                        features.append(
+                            {
+                                "type": "Feature",
+                                "geometry": {"type": "Point", "coordinates": [lon, lat]},
+                                "properties": {"id": feature_id, "name": name, "is_tbd": is_tbd},
+                            }
+                        )
+                    except (ValueError, IndexError):
+                        continue
+
+            return {"type": "FeatureCollection", "features": features}
+    except httpx.HTTPError as e:
+        raise HTTPException(status_code=502, detail=f"Failed to fetch landing point data: {str(e)}")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Internal error: {str(e)}")
+
+
+@router.get("/geo/all")
+async def get_all_geojson():
+    """获取所有可视化数据 (电缆 + 登陆点)"""
+    cables = await get_cables_geojson()
+    points = await get_landing_points_geojson()
+
+    return {
+        "cables": cables,
+        "landing_points": points,
+        "stats": {
+            "cable_count": len(cables.get("features", [])) if cables else 0,
+            "landing_point_count": len(points.get("features", [])) if points else 0,
+        },
+    }