ESRI ArcGIS Online
Accessing OS NGD data with OS NGD API – Features via ESRI ArcGIS Online
ArcGIS Online is a web-based platform geographic information system (GIS). ArcGIS Online services are managed by Esri and accessed by a client running on a wide range of options.
The instructions that follow demonstrate how to connect to OS NGD API – Features using ESRI ArcGIS Online.
What you need
Access to the ESRI ArcGIS Online service.
A preloaded base map, for example, OS Maps API.
OS NGD API – Features added to an API project in the OS Data Hub with an API Key. See Getting started with an API project for more information.
Instructions
Add an API and set up custom parameters
In the Add Layer dialog:
URL: Enter the base URL for OS NGD API – Features, excluding the API Key. For example, https://api.os.uk/features/ngd/ofa/v1.
Type: Select OGC feature layer.
Select Custom request parameters and enter the following:
Parameter: key
Value: [Insert your OS API Key here]
Click Next.

Adding layers to the map
In the Add Layer dialog:
To add a layer to the map: Select a layer to add to the map and then click Add to map.

The layer will then display in the Layers panel and the data will display on the map:

Features will automatically refresh when you zoom or pan on the map. If you wish to add multiple layers to the same map, repeat steps 2 and 3.
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