Remove osrm-components

[TheMarex]

We added support for small/big component flags in the tile plugins. That means we don't have to generate that with a separate tool but can serve it at runtime from the demo server.

• Fix style on map.project-osrm.org/debug to display small components
• Add link to go from route to debug map (osrm-frontend)
• Remove osrm-components

[daniel-j-h]

/cc @woodpeck @joto what's your take on this especially re. integration into other OSM QA tools?

[danpat]

There was no styling for the small components layer in osrm-frontend/debug, so I've added that here: Project-OSRM/osrm-frontend@2725627

However, the is_small attribute on the vector tiles from the develop branch is currently broken - it's always false. This is already fixed in rewrite/new-api.

@TheMarex if we're going to stick with the raster maps on the frontend, we could consider adding the small components there as a layer using: https://github.com/SpatialServer/Leaflet.MapboxVectorTile I've never used it, but it seems like it might work.

[joto]

@daniel-j-h: Not sure what this change means. If it means there is no way to get all the potential errors out of the system any more, but you have to ask for some in a specific area or so, than that would make integrating with other tools more difficult, if they rely on complete data dumps.

[daniel-j-h]

@joto we won't be able to generate the small components layer anymore which currently is getting used e.g. in your inspector. It will be only available on demand via http://map.project-osrm.org/debug/#14.07/52.5201/13.4036.

[danpat]

@daniel-j-h @joto note that if you're using OpenLayers 3 or Leaflet with the plugin above, the vector tiles from OSRM can be directly added to the map to replace the existing raster rendered tiles.

Example of adding vector tiles with OpenLayers 3:
http://openlayers.org/en/v3.14.1/examples/mapbox-vector-tiles-advanced.html

[joto]

@danpat That's not going to help with OSMI, because OSMI needs the raw data in some form. This is not only about rendered tiles, but about the data. And OSMI doesn't support vector tiles. (It probably should use vector tiles at some point, but that's a different issue.) So if you don't generate a Shapefile or Sqlite file or so from the data, OSMI (as it is today) can not show that layer any more.

[danpat]

@joto Ok. The main point of this change is to strip out our dependency on GDAL - we're only using it to generate the shapefiles for the small components layer.

For visual finding of small components, the debugging vector tiles should be used.

Can you describe how OSMI is using the small components shapefile for data? Maybe there's another format we can publish that would be simpler to generate.

[joto]

What's the problem with the GDAL dependency? If it is only for an extra program that nobody else uses then it isn't a problem, is it?

If you click on objects in OSMI you see the IDs etc. And you can get everything that's in a layer in a list instead of in a graphic.

[woodpeck]

OSMI could consume a different file (e.g. GeoJSON) just a well. But I can simply run an older version of the OSRM code directly on Geofabrik infrastructure to generate the "islands" view if that's easier.