Set label format to use starting letters of sites

geo_tools.py

@@ -69,7 +69,7 @@ def mask_shapefile_to_grid_indices(
 
             all_indices += sorted(indices.tolist(), key=lambda x: x[1])
             all_labels += [
-                f"{city}-{city_counts[city] + i}" for i in range(len(indices))
+                f"{city[0]}-{city_counts[city] + i}" for i in range(len(indices))
             ]
             city_counts[city] += len(indices)