UPDATE

crop_simulation/growth_simulation.py

@@ -11,6 +11,7 @@ from django.core.paginator import EmptyPage, Paginator
 
 from farm_data.models import SensorData
 from farm_data.services import get_canonical_farm_record, get_runtime_plant_for_farm
+from location_data.satellite_snapshot import build_location_satellite_snapshot
 from plant.gdd import calculate_daily_gdd, resolve_growth_profile
 from weather.models import WeatherForecast
 
@@ -188,14 +189,11 @@ def _build_weather_from_farm(sensor: SensorData) -> list[dict[str, Any]]:
 
 
 def _build_soil_and_site_from_farm(sensor: SensorData) -> tuple[dict[str, Any], dict[str, Any]]:
-    depths = list(sensor.center_location.depths.all())
-    top_depth = depths[0] if depths else None
-    smfcf = _safe_float(getattr(top_depth, "wv0033", None), 0.34)
-    smw = _safe_float(getattr(top_depth, "wv1500", None), 0.14)
-    sm0 = _safe_float(
-        _pick_first_not_none(getattr(top_depth, "porosity", None), getattr(top_depth, "wv0000", None)),
-        min(max(smfcf + 0.08, smw + 0.12), 0.6),
-    )
+    satellite_metrics = build_location_satellite_snapshot(sensor.center_location).get("resolved_metrics") or {}
+    ndwi = _safe_float(satellite_metrics.get("ndwi"), 0.28)
+    smfcf = _safe_float(ndwi, 0.34)
+    smw = max(round(smfcf * 0.45, 3), 0.12)
+    sm0 = min(max(smfcf + 0.08, smw + 0.12), 0.6)
     soil_moisture = None
     payload = sensor.sensor_payload or {}
     if isinstance(payload, dict):
@@ -292,7 +290,6 @@ def build_growth_context(payload: dict[str, Any]) -> GrowthSimulationContext:
     if payload.get("farm_uuid"):
         sensor = (
             SensorData.objects.select_related("center_location")
-            .prefetch_related("center_location__depths")
             .filter(farm_uuid=payload["farm_uuid"])
             .first()
         )