The Maps API allows visualization of different maps of Great Britain, and be displayed in approved third-party applications. From their site: OS OpenSpace is a free Ordnance Survey service that allows you to embed Ordnance Survey maps covering England, Scotland and Wales in your web apps. Place any kind of information that has a geographic reference on top of Ordnance Survey maps. Ordnance Survey is Great Britain's national mapping agency. The OS OpenSpace API is a piece of software code you can embed in your web application that provides all the necessary functionality to interact with a map, like panning, zooming in and out, and adding markers and polygons.
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06-09-18 17:08:01[SDK] Ordnance Survey Swift SDK updated with Related API Ordnance Survey Maps
06-09-18 16:41:12Added response format
06-09-18 16:39:12Tech info added: auth model, request/response. Updated description