added land

api/app/services/vegetation.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from app.config import get_settings
+from app.core.geo import PathPoint
+from app.core.landcover import LandcoverNotConfiguredError, landcover_path
+from app.core.vegetation import P833Coefficients, p833_attenuation
+
+
+def vegetation_loss_along(
+    points: list[PathPoint],
+    freq_hz: float,
+    include_vegetation: bool,
+    landcover_path_dir: str | Path | None = None,
+    canopy_path_dir: str | Path | None = None,
+) -> float:
+    if not include_vegetation:
+        return 0.0
+
+    settings = get_settings()
+    landcover_dir = landcover_path_dir or settings.landcover_path
+    canopy_dir = canopy_path_dir or settings.canopy_path
+
+    try:
+        path = landcover_path(points, landcover_dir, canopy_dir)
+    except LandcoverNotConfiguredError:
+        return 0.0
+
+    coefficients = P833Coefficients(
+        gamma_db_per_m=settings.p833_gamma_db_per_m,
+        max_attenuation_db=settings.p833_max_attenuation_db,
+    )
+    return p833_attenuation(
+        depth_m=path.vegetation_depth_m,
+        freq_hz=freq_hz,
+        forest_type="unknown",
+        coefficients=coefficients,
+    )