Mapbox-GL Filter by Reachability
Finding out your vacation rental is too far from the beach is a letdown - symbolize and filter houses (4,389!) based on walk time to the beach in Lerici, Italy
<!DOCTYPE html>
<html>
<head>
<!-- Include targomo core -->
<script src="https://releases.targomo.com/core/latest.min.js"></script>
<!-- Include mapboxgl javascript and css -->
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.6.0/mapbox-gl.js"></script>
<link href="https://api.tiles.mapbox.com/mapbox-gl-js/v1.6.0/mapbox-gl.css" rel="stylesheet">
<!-- Include micro progress bar -->
<script src="https://www.targomo.com/developers/scripts/mipb.min.js"></script>
<style>
body,
html {
margin: 0;
width: 100%;
height: 100%;
}
#map {
width: 100%;
height: 100%;
}
#filter {
position: absolute;
margin: 10px;
font-family: 'Open Sans', sans-serif;
top: 0;
display: flex;
align-items: center;
padding: 5px 8px;
background: #fff;
}
</style>
</head>
<body>
<!-- where the map will live -->
<div id="map"></div>
<div id="filter">
<div>Walk time (m)</div>
<input type="range" min="0" max="30" value="30" name="time" step="1"
onchange="rangevalue.value=value; filterPoints(value)" />
<output id="rangevalue">30</output>
</div>
<script>
// create targomo client
const client = new tgm.TargomoClient('westcentraleurope', '__targomo_key_here__');
// define map center and search source
const lnglat = [9.918, 44.08];
const travelTimes = [300, 600, 900, 1200, 1500, 1800];
const attributionText = `<a href="https://www.targomo.com/developers/resources/attribution/" target="_blank">© Targomo</a>`;
// set the progress bar
const pBar = new mipb({ fg: "#FF8319" });
pBar.show();
// add the map and set the center
const map = new mapboxgl.Map({
container: 'map',
style: 'https://api.maptiler.com/maps/hybrid/style.json?key=__your_maptiler_api_key__',
zoom: 12.5, center: lnglat, attributionControl: false,
}).addControl(
new mapboxgl.NavigationControl()
).addControl(
new mapboxgl.AttributionControl({ compact: true, customAttribution: attributionText })
);
// disable scroll zoom
map.scrollZoom.disable();
map.on('load', () => {
// find the first symbol layer
const firstSymbolLayer = map.getStyle().layers.find(l => l.type === 'symbol');
// add empty source
map.addSource('sources', {
"type": "geojson",
"data": { type: 'FeatureCollection', features: [] }
});
map.addLayer({
"id": "beaches",
"type": "circle",
"source": 'sources',
'paint': {
'circle-radius': 7,
'circle-color': '#DAA520',
'circle-stroke-width': 1.5,
'circle-stroke-color': '#fff'
}
}, firstSymbolLayer.id);
// add empty source
map.addSource('targets', {
"type": "geojson",
"data": { type: 'FeatureCollection', features: [] }
});
// reachable houses
map.addLayer({
'id': 'houses-reachable',
'type': 'circle',
'source': 'targets',
'filter': ['<', 'travelTime', 30 * 60],
'paint': {
'circle-radius': {
'base': 1.75,
'stops': [[12, 2], [22, 180]]
},
'circle-color': {
'property': 'travelTime',
'stops': [
[360, '#1a9641'],
[720, '#a6d96a'],
[1080, '#ffffbf'],
[1440, '#fdae61'],
[1800, '#d7191c']
]
},
}
}, 'beaches');
// unreachable houses, symbolized gray
map.addLayer({
'id': 'houses-unreachable',
'type': 'circle',
'source': 'targets',
'filter': ['>=', 'travelTime', 30 * 60],
'paint': {
'circle-radius': {
'base': 1.75,
'stops': [[12, 2], [22, 180]]
},
'circle-color': '#aaa'
}
}, 'houses-reachable');
// go get the actual data
dataInit();
})
async function dataInit() {
const beachurl = 'https://raw.githubusercontent.com/targomo/data-exports/master/overpass/beach_public_lerici.geojson';
const houseurl = 'https://raw.githubusercontent.com/targomo/data-exports/master/overpass/building_house_lerici.geojson';
// get OSM public beaches dataset
const beaches = await fetch(beachurl).then(async (data) => {
return await data.json();
})
// update map
map.getSource('sources').setData(beaches);
// get OSM building=house dataset
const houses = await fetch(houseurl).then(async (data) => {
return await data.json();
})
// update map
map.getSource('targets').setData(houses);
// calculate reachability of houses from beaches
getReachability(beaches, houses);
}
function getReachability(beaches, houses) {
// create formatted 'sources' for analysis
const sources = beaches.features.map((beach) => {
return {
id: beach.properties['@id'],
lat: beach.geometry.coordinates[1],
lng: beach.geometry.coordinates[0]
}
});
// create formatted 'targets' for analysis
const targets = houses.features.map((house) => {
return {
id: house.properties['@id'],
lat: house.geometry.coordinates[1],
lng: house.geometry.coordinates[0]
}
});
// define some options for the reachability service
const options = {
travelType: 'walk',
maxEdgeWeight: 30 * 60,
edgeWeight: 'time'
};
// calculate reachability of houses from beaches
client.reachability.combined(sources, targets, options).then((reachability) => {
// only consider the minimum travel time
const combinedReach = {};
targets.forEach(place => combinedReach[String(place.id)] = -1);
reachability.forEach(target => {
const id = String(target.id)
if (!combinedReach[id]) {
console.warn('NOT FOUND', String(target.id))
} else {
if (target.travelTime > -1) {
if (combinedReach[id] > -1) {
combinedReach[id] = Math.min(combinedReach[id], target.travelTime)
} else {
combinedReach[id] = target.travelTime
}
}
}
})
// map targets to travel times
const reach = {
type: 'FeatureCollection',
features: targets.map(place => {
let location = {
type: "Feature",
properties: {
travelTime: combinedReach[String(place.id)] > -1 ?
combinedReach[String(place.id)] :
30 * 60 + 1
},
geometry: {
type: "Point",
coordinates: [place.lng, place.lat]
}
}
return location
})
}
// update source with travel-time augmented data
map.getSource('targets').setData(reach);
pBar.hide();
})
}
function filterPoints(minutes) {
// update the map filter to update symbolization based on range value
map.setFilter('houses-reachable', ['<', 'travelTime', minutes * 60]);
map.setFilter('houses-unreachable', ['>=', 'travelTime', minutes * 60 + 1]);
}
</script>
</body>
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