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notifications-admin/app/broadcast_areas/source_files/README.md

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# Adding or updating source files
If the files are in GeoJSON format you can drop them straight in.
If you have a Shapefile, for example from the [ONS Open Geography Portal](https://geoportal.statistics.gov.uk/), you need to convert it:
- download the .zip from the portal
- extract it, giving you a folder with a few files in
- go to https://mapshaper.org
- drag all the files in the folder into mapshaper
- click import
- you should see a rendering of the shapes
- click console (top right)
- run this command: `mapshaper -proj wgs84`
- click export (top right)
- choose GeoJSON
- click the button
- done