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Coverage, Detail and Update Frequency Compared Ordnance Survey provides a wide range of mapping datasets, from free public data to highly detailed commercial products. Two of the most commonly discussed datasets are OS MasterMap  and OS OpenData , so let's compare OS MasterMap and OS OpenData. While both datasets originate from Ordnance Survey, they serve very different purposes. OS OpenData is a collection of free datasets released by the UK government to support innovation

What Data Does OS MasterMap Contain? Ordnance Survey MasterMap is the most detailed and accurate digital mapping dataset available for Great Britain. It is widely used by architects, planners, engineers, developers and utility companies who need reliable geographic data for design, planning and infrastructure projects. Unlike traditional printed maps, OS MasterMap is a dynamic database of geographic features. It contains millions of individual objects that represent the real