Are there any special characteristics of Ordnance Survey data derived from the Boundary-Line™ product?
Ordnance Survey data derived from the Boundary-Line™ product is derived from Ordnance Survey’s dataset Boundary-Line and will still show the following characteristics: Extent of the Realm (EOR) This is where a boundary area is digitised on the alignment of the mean low water for the seaward extent. This is prevalent particularly around the estuaries of Great Britain. All Ordnance Survey data derived from the Boundary-Line™ product that extends into the sea include the EOR extent. Area Values The area values attribute (HECTARES) quoted is retained from the source data. Area values of each ADMIN_UNIT_ID in Ordnance Survey data derived from the Boundary-Line™ product include the Extent of the Realm (EOR). Treatment of boundaries in estuaries The extent of the realm (EOR) follows mean low water and crosses the estuaries at the level of the sea at low water. In this example showing Westminster Constituencies, an adjoining boundary also extends into the estuary. Seaward extensions These are
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