first version of small place id and geometry retrieval

data_processing/get_smallAreaInfo.py

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+import json
+import os
+
+# Define the file path
+file_path = os.path.join('given_data', 'smasvaedi_2021.json')
+
+# Load the JSON data
+with open(file_path, 'r', encoding='utf-8') as file:
+    data = json.load(file)
+
+def get_smallAreas():
+    '''
+    Returns a list of tuples where each tuple (id, geometry) contains
+    the smsv ID and the corresponding geometry (coordinates) for 
+    features in Höfuðborgarsvæði.
+    '''
+    # Extract smsv IDs and geometries for Höfuðborgarsvæði
+    hofudborgarsvaedi_areas = []
+
+    for feature in data['features']:
+        if feature['properties'].get('nuts3_label') == "Höfuðborgarsvæði":
+            smsv = feature['properties'].get('smsv')
+            raw_geometry = feature['geometry']
+            if smsv and raw_geometry:
+                # Extract coordinates and convert to list of tuples
+                processed_geometry = []
+                for polygon in raw_geometry['coordinates']:
+                    # for ring in polygon:  # Each "ring" of the MultiPolygon
+                    #     processed_geometry.append([(x, y) for x, y in ring])
+                    processed_geometry = [(x, y) for x, y in polygon[0]]
+
+                hofudborgarsvaedi_areas.append((smsv, processed_geometry))
+
+    # Check for duplicate IDs
+    ids = [area[0] for area in hofudborgarsvaedi_areas]
+    unique_ids = set(ids)
+    if len(unique_ids) < len(ids):
+        duplicates = [smsv for smsv in ids if ids.count(smsv) > 1]
+        raise ValueError(f"Duplicates found! Duplicate IDs: {set(duplicates)}")
+    
+    return hofudborgarsvaedi_areas