Cadcorp SIS

Accessing OS NGD data with OS NGD API – Features via Cadcorp SIS

The Cadcorp Spatial Information System® (Cadcorp SIS®) is an integrated family of geospatial products comprising desktop, web, and developer applications.

Cadcorp SIS Desktop connects directly to the OS Data Hub through dedicated wizards.

The instructions that follow demonstrate how to connect to OS NGD API – Features using Cadcorp SIS Desktop version 9.1.1668.

What you need

• Cadcorp SIS (version SIS 9 or later).

• A preloaded base map, for example, OS Maps API.
• OS NGD API – Features added to an API project in the OS Data Hub. See Getting started with an API project for more information.

Instructions

These instructions are based on Cadcorp SIS Desktop version 9.1.1668.

1. In Cadcorp SIS Desktop, open an existing map or create a new one.

   

   Cadcorp SIS Desktop UI opening screen
2. In the Home tab, click Add Overlay.

   

   Cadcorp SIS Desktop UI highlighting Add Overlay button
3. In the Overlay Types dialog, select Ordnance Survey (GB) > OS (GB) Data Hub, and then click Next.

4. In the OS (GB) Data Hub dialog:

   • Select OS National Geographic Database (NGD) API – Features.

   • API Key: Enter your API key.

   • Premium/Public Sector Plan: Select this option if you have this plan.

   • Save in the UI settings database (encrypted): Select this option.

   • Click Next.

     

     Cadcorp SIS Desktop OS (GB) Data Hub dialog
5. In the OS Data Hub NGD API – Features Data Themes and Feature Types dialog:

   • Well-known ‘recipe’: Select a predefined recipe, if available.

   • Data Themes: Select your data themes.

   • Features: If necessary, use the editing tools (on the right) to delete feature types or to change the order in which they display in your SIS Workspace Definition (SWD). By default, all feature types within the selected data themes are available in the right panel.

   • Local cache: Select this option to store the data temporarily on your machine. If you save and reopen the SWD, the data will still be available as it is fetched from your local cache.

   • One-off import: Select this option to do a one-off import of the data. If you save and reopen the SWD, the data will not be available and you will need to re-import it. These imports have a larger file size.

   • Filtering: These settings are used in conjunction and define how much data is required for display. It is recommended that you always set a spatial filter and feature limit.

     • Spatial: The Intersect with current view extent option limits the download to only selected features within the current window extent. You can also load features within a specific area of interest using the polygon feature to draw your area of interest on the map BEFORE opening the Add Overlay dialog.

     • Maximum number of features: Limits the number of feature values downloaded to the number set. This limit is applied per feature within any filtered spatial area.

   • Click Finish.

     

     Cadcorp SIS Desktop OS Data Hub NGD API – Features Data Themes and Feature Types dialog
6. The selected themes and feature types display in the SWD and map area.

   

   Cadcorp SIS Desktop UI showing OS NGD API – Features data