update untis class

hydromt_fiat/api/data_types.py

@@ -10,9 +10,21 @@ class ExtractionMethod(str, Enum):
 
 
 class Units(str, Enum):
-    meters = ["meters", "m"]
-    feet = ["feet", "ft"]
-
+    meters = "meters",
+    feet = "feet"
+    @classmethod
+    def from_string(cls, value: str):
+        """Map different strings to the correct Units enum."""
+        mappings = {
+            "meters": cls.meters,
+            "m": cls.meters,
+            "feet": cls.feet,
+            "ft": cls.feet,
+        }
+        try:
+            return mappings[value]
+        except KeyError:
+            raise ValueError(f"Unknown unit: {value}")
 
 class Conversion(float, Enum):
     meters_to_feet = 3.28084

hydromt_fiat/api/exposure_vm.py

@@ -135,6 +135,7 @@ def set_asset_locations_source_and_get_data(
                 ground_elevation_unit=ground_elevation_unit,
                 bf_conversion=bf_conversion,
                 keep_unclassified=keep_unclassified,
+                unit=Units.meters.value,
             )
             primary_object_types = (
                 self.exposure.exposure_db["Primary Object Type"].unique().tolist()