first commit

api/app/routers/terrain.py

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+from fastapi import APIRouter, Query
+
+from app.models.common import SurfaceKind
+from app.models.terrain import (
+    ElevationResponse,
+    LosRequest,
+    LosResponse,
+    TerrainProfileRequest,
+    TerrainProfileResponse,
+)
+from app.routers.errors import as_501
+from app.services import terrain as terrain_service
+
+router = APIRouter()
+
+
+@router.get("/elevation", response_model=ElevationResponse)
+def elevation(
+    lat: float = Query(ge=-90, le=90),
+    lon: float = Query(ge=-180, le=180),
+    surface: SurfaceKind = "dtm",
+) -> ElevationResponse:
+    return as_501(lambda: terrain_service.elevation_at(lat, lon, surface))
+
+
+@router.post("/profile", response_model=TerrainProfileResponse)
+def profile(request: TerrainProfileRequest) -> TerrainProfileResponse:
+    return terrain_service.terrain_profile(request)
+
+
+@router.post("/los", response_model=LosResponse)
+def los(request: LosRequest) -> LosResponse:
+    return terrain_service.los(request)