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map.js
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map.js
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'use strict';
var turf = require('@turf/turf');
var _ = require('underscore');
var rbush = require('rbush');
module.exports = function(tileLayers, tile, writeData, done) {
var layer = tileLayers.osm.osm;
var listOfHighways = {};
var highwaysBboxes = [];
var majorRoads = {
motorway: true,
trunk: true,
primary: true,
secondary: true,
tertiary: true,
motorway_link: true,
trunk_link: true,
primary_link: true,
secondary_link: true,
tertiary_link: true
};
var minorRoads = {
unclassified: true,
residential: true,
living_street: true,
service: true,
road: true
};
var pathRoads = {
pedestrian: true,
track: true,
footway: true,
path: true,
cycleway: true,
steps: true
};
var preserveType = {};
preserveType = _.extend(preserveType, majorRoads);
preserveType = _.extend(preserveType, minorRoads);
preserveType = _.extend(preserveType, pathRoads);
var osmlint = 'crossinghighways';
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
if (
preserveType[val.properties.highway] &&
(val.geometry.type === 'LineString' ||
val.geometry.type === 'MultiLineString') &&
val.properties.layer === undefined
) {
highwaysBboxes.push(objBbox(val));
listOfHighways[val.properties['@id']] = val;
}
}
var highwaysTree = rbush(highwaysBboxes.length);
highwaysTree.load(highwaysBboxes);
var output = {};
for (var j = 0; j < highwaysBboxes.length; j++) {
var bbox = highwaysBboxes[j];
var highwayToEvaluate = listOfHighways[bbox.id];
var overlaps = highwaysTree.search(bbox);
for (var k = 0; k < overlaps.length; k++) {
var overlapBbox = overlaps[k];
var overlapHighway = listOfHighways[overlapBbox.id];
if (
bbox.id !== overlapBbox.id &&
isIntersecting(highwayToEvaluate, overlapHighway) &&
!checkCoordinates(highwayToEvaluate, overlapHighway)
) {
var intersectPoint = turf.lineIntersect(
overlapHighway,
highwayToEvaluate
);
if (intersectPoint && intersectPoint.features.length > 0) {
intersectPoint = intersectPoint.features[0];
if (
intersectPoint.geometry.type === 'Point' ||
intersectPoint.geometry.type === 'MultiPoint'
) {
var mergeHighwaysCoords = _.flatten(
overlapHighway.geometry.coordinates
);
mergeHighwaysCoords.concat(
_.flatten(highwayToEvaluate.geometry.coordinates)
);
var intersectPointCoord = _.flatten(
intersectPoint.geometry.coordinates
);
if (
_.difference(mergeHighwaysCoords, intersectPointCoord).length ===
mergeHighwaysCoords.length
) {
highwayToEvaluate.properties._osmlint = osmlint;
overlapHighway.properties._osmlint = osmlint;
output[bbox.id] = highwayToEvaluate;
output[overlapBbox.id] = overlapHighway;
intersectPoint.properties = {
_fromWay: highwayToEvaluate.properties['@id'],
_toWay: overlapHighway.properties['@id'],
_osmlint: osmlint,
_type: classification(
majorRoads,
minorRoads,
pathRoads,
highwayToEvaluate.properties.highway,
overlapHighway.properties.highway
)
};
if (
highwayToEvaluate.properties['@id'] >
overlapHighway.properties['@id']
) {
output[
bbox.id.toString().concat(overlapBbox.id)
] = intersectPoint;
} else {
output[
overlapBbox.id.toString().concat(bbox.id)
] = intersectPoint;
}
}
}
}
}
}
}
var result = _.values(output);
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};
function checkCoordinates(high1, high2) {
var coord1 = high1.geometry.coordinates;
var coord2 = high2.geometry.coordinates;
if (
(coord1[0][0] === coord2[0][0] && coord1[0][1] === coord2[0][1]) ||
(coord1[0][0] === coord2[coord2.length - 1][0] &&
coord1[0][1] === coord2[coord2.length - 1][1]) ||
(coord1[coord1.length - 1][0] === coord2[0][0] &&
coord1[coord1.length - 1][1] === coord2[0][1]) ||
(coord1[coord1.length - 1][0] === coord2[coord2.length - 1][0] &&
coord1[coord1.length - 1][1] === coord2[coord2.length - 1][1])
) {
return true;
}
return false;
}
function isIntersecting(high1, high2) {
var coord1 = high1.geometry.coordinates;
var coord2 = high2.geometry.coordinates;
var x1 = coord1[0][0];
var y1 = coord1[0][1];
var x2 = coord1[coord1.length - 1][0];
var y2 = coord1[coord1.length - 1][1];
var x3 = coord2[0][0];
var y3 = coord2[0][1];
var x4 = coord2[coord2.length - 1][0];
var y4 = coord2[coord2.length - 1][1];
var adx = x2 - x1;
var ady = y2 - y1;
var bdx = x4 - x3;
var bdy = y4 - y3;
var s = (-ady * (x1 - x3) + adx * (y1 - y3)) / (-bdx * ady + adx * bdy);
var t = (+bdx * (y1 - y3) - bdy * (x1 - x3)) / (-bdx * ady + adx * bdy);
return s >= 0 && s <= 1 && t >= 0 && t <= 1;
}
function classification(major, minor, path, fromHighway, toHighway) {
if (major[fromHighway] && major[toHighway]) {
return 'major-major';
} else if (
(major[fromHighway] && minor[toHighway]) ||
(minor[fromHighway] && major[toHighway])
) {
return 'major-minor';
} else if (
(major[fromHighway] && path[toHighway]) ||
(path[fromHighway] && major[toHighway])
) {
return 'major-path';
} else if (minor[fromHighway] && minor[toHighway]) {
return 'minor-minor';
} else if (
(minor[fromHighway] && path[toHighway]) ||
(path[fromHighway] && minor[toHighway])
) {
return 'minor-path';
} else if (path[fromHighway] && path[toHighway]) {
return 'path-path';
}
}
function objBbox(obj, id) {
var bboxExtent = ['minX', 'minY', 'maxX', 'maxY'];
var bbox = {};
var valBbox = turf.bbox(obj);
for (var d = 0; d < valBbox.length; d++) {
bbox[id || bboxExtent[d]] = valBbox[d];
}
bbox.id = obj.properties['@id'];
return bbox;
}