feat: stage5 — Satellite tiles (F04) and Coordinates (F13)

src/gps_denied/schemas/satellite.py

@@ -0,0 +1,22 @@
+"""Satellite domain schemas."""
+
+from pydantic import BaseModel
+
+from gps_denied.schemas import GPSPoint
+
+
+class TileCoords(BaseModel):
+    """Web Mercator tile coordinates."""
+    x: int
+    y: int
+    zoom: int
+
+
+class TileBounds(BaseModel):
+    """GPS boundaries of a tile."""
+    nw: GPSPoint
+    ne: GPSPoint
+    sw: GPSPoint
+    se: GPSPoint
+    center: GPSPoint
+    gsd: float  # Ground Sampling Distance (meters/pixel)