Preserve native orthophoto detail for training

backend/tests/test_sprint196_map_orthophoto_analysis.py

@@ -92,6 +92,7 @@ def _selection_payload(
     force_refresh: bool = True,
     area_id=None,
     product_key: str = "most_recent",
+    resolution_m: float | None = None,
 ) -> OrthophotoAcquireRequest:
     west, south = 199_000.0, 210_000.0
     transformer = Transformer.from_crs("EPSG:31370", "EPSG:4326", always_xy=True)
@@ -108,6 +109,7 @@ def _selection_payload(
         area_id=area_id,
         product_key=product_key,
         force_refresh=force_refresh,
+        resolution_m=resolution_m,
     )
 
 
@@ -143,6 +145,21 @@ def test_orthophoto_request_is_bounded_and_uses_official_wms_contract() -> None:
     assert len(prepared["request_hash"]) == 64
 
 
+def test_training_request_can_use_native_resolution_but_not_oversample_source() -> None:
+    settings = Settings(_env_file=None)
+    prepared = OrthophotoAcquisitionService._prepared_request(
+        _selection_payload(product_key="wallonia_latest", resolution_m=0.25), settings
+    )
+    assert 2_000 <= prepared["width"] <= 2_120
+    assert prepared["resolution_m"] == 0.25
+
+    with pytest.raises(AppError) as exc_info:
+        OrthophotoAcquisitionService._prepared_request(
+            _selection_payload(product_key="wallonia_latest", resolution_m=0.1), settings
+        )
+    assert exc_info.value.code == "ORTHOPHOTO_RESOLUTION_EXCEEDS_SOURCE"
+
+
 def test_orthophoto_product_registry_exposes_only_governed_official_layers() -> None:
     settings = Settings(_env_file=None)
     products = OrthophotoAcquisitionService.list_products(settings)