Creating Vector Tiles from Ordnance Survey Opendata

This repository contains the presentation materials, samples and code for talk given by Dave Barter at the FOSS4G 2018 Open Source conference.

All of the content within is curated by Nautoguide Ltd. who are really nice and you should talk to them about developing some lovely map web sites.

It's all licensed under the GPL APART from the content of the fonts directory which are derived from https://github.com/mapbox/fontnik and licensed under the OFL or Apache licenses.

Creating Tiles

create_tiles contains the make_vector_tiles.pl script which provides a wrapper around the workflow necessary to create MVT format vector tiles from multiple shape files. This requires a config file config.json

The config must include a config section:

 "config": {
    "output_file": "/opt/nautoguide/gisraw/vector_tiles/os_all.mbtiles",
    "tmp_dir": "/tmp/os_opendata/",
    "minzoom": 0,
    "maxzoom": 16,
    "detail_level": 8
  }

minzoom and maxzoom set the zoom level range for the tiles

detail_level sets the detail level (-d) parameter of tippecanoe, more detail at this link

Individual layers are formatted as follows:-

"openmap_railwaystation": [
      {
        "name": "Openmap Railway Station",
        "file": "/opt/nautoguide/gisraw/os-opendata-2016/openmap_vector/data/RailwayStation.shp",
        "maxzoom": 16,
        "minzoom": 13,
        "attrs": [
          "distname,classifica,featcode"
        ],
        "add": {
          "name": "Openmap Railway Station"
        }
      }
    ]

file must point to an ESRI shapefile in EPSG:27700

The maxzoom and minzoom attributes are used to restrict the zoom levels for this layer

The attrs array selects the attributes from the shapefile to be copied into the layer attributes

The add structure allows you to add fixed data to the layer attributes

OS Opendata Mapbox Style

This is very much work in progress but the latest style can be found in the mapbox-samples directory in the file os_opendata_style.js