Files for https://github.com/mapbox/tile-reduce/issues/76

dc.json

tile.json

tilereduce_test.js

#!/usr/bin/node

"use strict";

var path = require("path");
var TileReduce = require("tile-reduce");

var opts = {
  zoom: 15,
  sources: [
    {
      name: "dc",
      mbtiles: path.join(__dirname, "dc.mbtiles"),
      layers: ["dc"],
    },
  ],
  map: path.join(__dirname, "tilereduce_test_map.js"),
  tiles: [[9378, 12535, 15]],
};

TileReduce(opts);

tilereduce_test_map.js

"use strict";

var turf = require("turf");
var util = require("util");

function map(data, tile, writeData, done, args) {
  var feature = data.dc.dc.features[0];
  var square = turf.bboxPolygon([-76.965, 38, -76, 38.895]);

  console.info("map tile %s", JSON.stringify(tile));

  console.info("---------------------------------------------------------------");
  console.info("feature = %s;", util.inspect(feature, { depth: 4 }));
  console.info("square = %s;", util.inspect(square, { depth: 4 }));

  try {
    var intersect = turf.intersect(square, feature);
    console.info("intersect = %s;", util.inspect(intersect, { depth: 4 }));
  } catch (ex) {
    console.info("*** turf.intersect exception: %s", ex);
  }

  console.info("---------------------------------------------------------------");
  console.info("converting to MultiPolygon");
  feature.geometry.type = "MultiPolygon";
  var coords = [];
  for (var ring of feature.geometry.coordinates) {
    coords.push([ring]);
  }
  feature.geometry.coordinates = coords;
  console.info("feature = %s;", util.inspect(feature, { depth: 5 }));
  try {
    var intersect = turf.intersect(square, feature);
    console.info("intersect = %s;", util.inspect(intersect, { depth: 5 }));
  } catch (ex) {
    console.info("*** turf.intersect exception: %s", ex);
  }

  console.info("---------------------------------------------------------------");

  done(null, null);
}


module.exports = map;