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mapeo-print-preview

This is an experimental repository, supporting a larger effort to bring web vector tile rendering to Mapeo Desktop.

What is this?

This repo is a collection of three command line scripts that build the necessary resources to render an osm-p2p-db, plus some additional data, as an interactive mapbox-gl-js web map.

Usage

The scripts all take a dataset parameter, which is a path to a directory.

Here is a listing of the files that need to appear in that dataset directory and where they currently come from:

  • Pre-Made
    • presets.json: a list of presets, fields, categories, and defaults. This is described by the iD presets format, and concatenated into a single JSON file.
    • icons/: a directory of SVGs icons, referenced by the presets in presets.json.
    • layerify.js: not generally needed; a hack for one of our datasets (wao), so we can cut up the OSM data into layers dynamically as they are served.
    • osm/: directory of osm-p2p data. Likely created by Mapeo Desktop.
    • style.json: a JSON file adhering to the MapBox Style Specification.
  • Generated
    • geo.json: GeoJSON export of the osm-p2p database. Produced by running the export.js script.
    • icons.{json,png}: Icons of SVG presets, converted into a single PNG sprite sheet. The JSON file describes the names & locations in the spritesheet of each icon. Produced by running the build_sprites.js script.

If you have such a directory, you can generate the GeoJSON and the PNG icons and then serve it up as a website as

$ node build_sprites.js local_parks/

$ node export.js local_parks/

$ node serve.js local_parks/

Serving on http://localhost:9050/

Conclusions

Once all of these files are present in a directory in the root dir of this repo, node serve.js dataset/ will start a local HTTP server, serving an interactive web map of the OSM data, presets, & icons provided.

This is still very tedious. This work is meant as a proof-of-concept that we can render vector tiles efficiently for osm-p2p data, and as a base for the future work of integrating vector tile rendering into Mapeo Desktop.

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Demo of web vector tiles for osm-p2p data.

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