# ESRI ArcGIS Pro

ESRI ArcGIS Pro is a desktop geographic information system (GIS) application that allows users to maintain, visualise and analyse spatial data.

The instructions that follow demonstrate how to connect to OS Maps API using ESRI ArcGIS Pro.

## What you need

* OS Maps API added to an API project in the OS Data Hub with an API Key; see [Getting started with an API project](/os-apis/core-concepts/getting-started-with-an-api-project.md) for more information
* ArcGIS Pro (version 2.3.3 or later)

## Instructions

{% stepper %}
{% step %}
**Set up a connection**

Once a new project with a new map has been set up, select *Insert* > *Connections* > *Server* > *New WMTS Server*.

<figure><img src="/files/VxwUQe13D9agirTLgn9q" alt="ESRI ArcGIS Pro UI to add new WMTS Server"><figcaption><p>ESRI ArcGIS Pro UI to add new WMTS Server</p></figcaption></figure>
{% endstep %}

{% step %}
**Add an API URL and set up custom parameters**

In the Add WMTS Server Connection dialog:

* **Server URL**: Enter the URL for OS Maps API, excluding the API Key. For example, <https://api.os.uk/maps/raster/v1/wmts>.

<figure><img src="/files/OSLNl2VfOAPEwQXKsyCd" alt="ESRI ArcGIS Pro Add WMTS Server Connection dialog."><figcaption><p>ESRI ArcGIS Pro Add WMTS Server Connection dialog.</p></figcaption></figure>

* Select *Custom request parameters* and enter the following:
  * **Parameter**: key
  * **Value**: \[Insert your OS API Key here]
* Click *OK*.

<figure><img src="/files/5hLOkHgvrmWi4rm4Bvqf" alt="ESRI ArcGIS Pro Add WMTS Server Connection dialog with custom request parameters set."><figcaption><p>ESRI ArcGIS Pro Add WMTS Server Connection dialog with custom request parameters set.</p></figcaption></figure>
{% endstep %}

{% step %}
**Adding layers to the map**

\_You can explore the available layers in OS Maps API by using the ArcGIS Pro Catalog panel.

In the Catalog panel:

* **To add a layer to the map**: Right-click on a layer and select *Add to Current Map*.

<figure><img src="/files/87z8TE4u50hWZBkstawP" alt="ESRI ArcGIS Pro Catalog panel."><figcaption><p>ESRI ArcGIS Pro Catalog panel.</p></figcaption></figure>

\_The layer will then display in the Contents panel and the data will display on the map:

<figure><img src="/files/jvjGQFNrXW57hFfGc5fW" alt=""><figcaption><p>ArcGIS Pro UI showing OS Maps API in the map area.</p></figcaption></figure>
{% endstep %}
{% endstepper %}


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