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api/app/models/viewshed.py

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+from pydantic import BaseModel, Field
+
+from app.models.common import AntennaPoint, OutputFormat, SurfaceKind
+
+
+class ViewshedRequest(BaseModel):
+    observer: AntennaPoint
+    radius_m: float = Field(gt=0)
+    target_height_agl: float = Field(default=2, ge=0)
+    surface: SurfaceKind = "dsm"
+    k_factor: float = Field(default=1.333, gt=0)
+    format: OutputFormat = "geotiff"