Class: OvertureMaps::TilesController

Inherits:
ApplicationController show all
Defined in:
app/controllers/overture_maps/tiles_controller.rb

Overview

Mapbox Vector Tiles straight from PostGIS:

GET /overture/tiles/places/14/2620/5723.mvt

MapLibre/Leaflet can render imported data with no separate tile server:

map.addSource("places", { type: "vector",
tiles: ["https://app.example.com/overture/tiles/places/{z}/{x}/{y}.mvt"] })

Constant Summary collapse

LAYERS = 
FeaturesController::RESOURCES
PROPERTY_COLUMNS = 
{
  "places" => %w[name primary_category confidence country],
  "buildings" => %w[name subtype building_class height num_floors],
  "addresses" => %w[number street locality postcode],
  "divisions" => %w[name subtype country],
  "segments" => %w[name subtype segment_class],
  "connectors" => %w[],
  "base_features" => %w[name feature_type subtype feature_class]
}.freeze
MAX_ZOOM = 
22
TILE_EXTENT = 
4096
TILE_BUFFER = 
64
ENVELOPE_MARGIN =

Half a buffer's worth of envelope margin so buffered geometries at the tile edge are included.

TILE_BUFFER.to_f / TILE_EXTENT

Instance Method Summary collapse

Instance Method Details

#show ⇒ Object 



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# File 'app/controllers/overture_maps/tiles_controller.rb', line 31

def show
  layer = params[:layer]
  model = LAYERS[layer]
  return render json: { error: "unknown layer" }, status: :not_found unless model

  z, x, y = tile_coordinates
  tile = build_tile(model, layer, z, x, y)

  expires_in 1.hour, public: true
  send_data tile, type: "application/vnd.mapbox-vector-tile", disposition: "inline"
end