How to use the turf.featureCollection function in turf
To help you get started, we’ve selected a few turf examples, based on popular ways it is used in public projects.
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osmlab / osmlint / validators / filterNHS / map.js View on Github 
var osmlint = '01_dir_template';
var result = [];
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
//writeData(JSON.stringify(val) + '\n');
//here comes all your code to validate the data
// val.properties._osmlint = osmlint;
// result.push(val);
if (val.properties.FULLNAME && val.properties.FULLNAME ==='US Hwy 1'){
result.push(val);
}
}
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};}
}
// Check the outputs
if (_.size(nearRoads.evalRoad) > 0 && _.size(nearRoads.paralled) > 0 && _.size(nearRoads.output) > 0 && _.size(nearRoads.intersecCoord) > 0) {
for (var type in nearRoads) {
for (var feature in nearRoads[type]) {
output[feature] = nearRoads[type][feature];
}
}
}
}
}
var result = _.values(output);
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};module.exports = function(tileLayers, tile, writeData, done) {
var layer = tileLayers.osm.osm;
var result = layer.features.filter(function(val) {
if (val.properties.bridge && (val.geometry.type === 'Point')) {
val.properties._osmlint = 'bridgeonnode';
return true;
}
});
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};var overlapCoords = overlapObj.geometry.coordinates;
if (_.intersection(coords, overlapCoords).length === 2 && (
valueHighway.properties['turn:lanes:backward'] ||
valueHighway.properties['turn:lanes:forward'] ||
valueHighway.properties['turn:lanes'])) {
output[valueHighway.properties['@id']] = valueHighway;
output[overlap[4].id] = overlapObj;
}
}
}
}
}
var result = _.values(output);
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};'motorway_link': true,
'trunk_link': true,
'primary_link': true,
'secondary_link': true,
'tertiary_link': true
};
var result = [];
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
if (majorRoads[val.properties.highway]) {
val.properties._osmlint = osmlint;
result.push(val);
}
}
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};module.exports = function(tileLayers, tile, writeData, done) {
var layer = tileLayers.osm.osm;
var result = layer.features.filter(function(obj) {
return (obj.properties['@timestamp'] >= today);
});
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};module.exports = function(tileLayers, tile, writeData, done) {
var layer = tileLayers.osm.osm;
var osmlint = 'wikidatanoenglishname';
var result = [];
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
if (val.geometry.type === 'Point' && val.properties.place && val.properties.wikidata && !val.properties['name:en']) {
val.properties._osmlint = osmlint;
result.push(val);
}
}
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};var highways = [];
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
if (val.properties.highway &&
val.properties.name &&
(val.properties.name.indexOf(' ' + val.properties['@user']) > -1 || val.properties.name.indexOf(val.properties['@user'] + ' ') > -1 ||
levenshtein.get(val.properties.name, val.properties['@user']) < 2)) {
val.properties._osmlint = osmlint;
highways.push(val);
}
}
var result = _.values(highways);
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};var overlapObj = motorwayJunction[overlap[4].id];
if (overlapObj && valueHighway.properties['@id'] !== overlapObj.properties['@id'] && overlapObj.properties.highway === 'motorway_junction') {
var coords = _.flatten(valueHighway.geometry.coordinates);
var overlapCoords = overlapObj.geometry.coordinates;
if (_.intersection(coords, overlapCoords).length === 2) {
output[valueHighway.properties['@id']] = valueHighway;
output[overlap[4].id] = overlapObj;
}
}
}
}
}
var result = _.values(output);
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};module.exports = function(tileLayers, tile, writeData, done) {
var layer = tileLayers.osm.osm;
var osmlint = 'noname';
var result = [];
for (var i = 0; i < layer.features.length; i++) {
var val = layer.features[i];
if (val.properties.highway && val.properties.name && val.properties.name.replace(/\s/g, '').replace(/-/g, '').toLowerCase().indexOf('noname') > -1) {
val.properties._osmlint = osmlint;
result.push(val);
}
}
if (result.length > 0) {
var fc = turf.featureCollection(result);
writeData(JSON.stringify(fc) + '\n');
}
done(null, null);
};turf
a JavaScript library for performing geospatial operations with GeoJSON
