Splitting up UK ONS Geoportal Data into GeoJSON Boundary Files
As you may know if you’ve ever used the UK Geoportal site to get boundaries as features or GeoJSON, once you’ve converted and re-projected your files you probably still have a file that’s too large to serve over the wire, even if you’ve simplified them with a tool like mapshaper.
A common approach to get around this is to split the file up into GeoJSON features, with a single feature per file, or load the whole lot into ElasticSearch. I might write a quick blog at some point about the Elasticsearch ETL process, but here’s a quick snippet to split out a file, in this case the Output Areas file, into thousands of GeoJSON files named by their GSS code.
Alex Lynham
Notes on working for a startup in Manchester and various other projects.
alex@lynh.am
