Persist raster tile CRS metadata

backend/README.md

@@ -369,7 +369,9 @@ detections against persisted `vector_features`, persists QA/QC rows and exports
 the detection GeoJSON. It never seeds demo detections, enables fixture mode,
 fetches live providers or downloads model weights. Configured-YOLO model class
 labels are normalized to lowercase for filtering and persisted detections while
-the original model label is retained in detection provenance. Current V1 upload
+the original model label is retained in detection provenance. Raster tile
+manifests generated for AI handoff include source CRS metadata so pixel-space
+model outputs can be transformed to WGS84 GeoJSON coordinates. Current V1 upload
 support is limited to GeoTIFF-style rasters and GeoJSON/JSON reference vectors.
 
 ### Run backend

backend/app/services/raster_operations_service.py

@@ -939,8 +939,13 @@ class RasterOperationsService:
 
         manifest_tiles: list[dict[str, Any]] = []
         tile_paths: list[str] = []
+        source_crs: str | None = None
 
         with rasterio.open(dataset.storage_path) as source:
+            raw_source_crs = getattr(source, "crs", None)
+            source_crs = raw_source_crs.to_string() if hasattr(raw_source_crs, "to_string") else (
+                str(raw_source_crs) if raw_source_crs else dataset.crs
+            )
             source_count = getattr(source, "count", 0)
             if not source_count:
                 source_count = 1
@@ -981,6 +986,7 @@ class RasterOperationsService:
                             "pixel_window": [int(xoff), int(yoff), int(tile_width), int(tile_height)],
                             "bounds": RasterOperationsService._window_bounds_to_list(bounds),
                             "transform": [float(item) for item in transform.to_gdal()],
+                            "crs": source_crs,
                             "index": tile_index,
                         },
                     )
@@ -994,10 +1000,14 @@ class RasterOperationsService:
         except AppError:
             source_metadata = {"bounds": [0.0, 0.0, 0.0, 0.0]}
         bounds = source_metadata.get("bounds", [0.0, 0.0, 0.0, 0.0])
+        manifest_crs = source_crs or source_metadata.get("crs") or dataset.crs
         manifest_payload = {
             "tile_set_id": tile_set_id,
             "source_dataset_id": str(dataset.id),
             "source_raster_id": str(dataset.id),
+            "crs": manifest_crs,
+            "source_crs": manifest_crs,
+            "dataset_crs": dataset.crs,
             "bounds": [float(value) for value in bounds],
             "tile_size": int(tile_size),
             "overlap": int(overlap),

backend/tests/test_raster_operations_service.py

@@ -606,6 +606,10 @@ def test_raster_tile_returns_manifest_payload(monkeypatch, tmp_path) -> None:
                 float(window.yoff + window.height),
             )
 
+    class FakeCRS:
+        def to_string(self):
+            return "EPSG:31370"
+
     class FakeSource:
         width = 10
         height = 10
@@ -614,6 +618,7 @@ def test_raster_tile_returns_manifest_payload(monkeypatch, tmp_path) -> None:
             self.profile = {"width": self.width, "height": self.height, "count": 1, "dtype": "uint8", "transform": None}
             self.transform = None
             self.nodata = 0
+            self.crs = FakeCRS()
 
         def read(self, *args, **kwargs):
             return FakeArray()
@@ -670,7 +675,10 @@ def test_raster_tile_returns_manifest_payload(monkeypatch, tmp_path) -> None:
     assert payload["manifest"]["overlap"] == 1
     assert payload["manifest"]["source_dataset_id"] == str(dataset_id)
     assert payload["manifest"]["source_raster_id"] == str(dataset_id)
+    assert payload["manifest"]["crs"] == "EPSG:31370"
+    assert payload["manifest"]["source_crs"] == "EPSG:31370"
     assert payload["manifest"]["count"] == payload["count"]
+    assert payload["manifest"]["tiles"][0]["crs"] == "EPSG:31370"
     assert payload["manifest"]["tiles"][0]["bounds"] == [0.0, 0.0, 4.0, 4.0]
     assert payload["manifest"]["ai_inference"] is False
     assert payload["manifest"]["tile_server"] is None