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topojson on a map: buffers
license: mit
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.css' rel='stylesheet' />
<script src="https://cdnjs.cloudflare.com/ajax/libs/Turf.js/2.0.2/turf.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
#map {
position:absolute;
width: 100%;
height: 100%;
}
svg {
position: absolute;
width: 100%;
height: 100%;
}
.land {
stroke: #111;
stroke-opacity: 1;
fill: #efe93d;
fill-opacity: 0.1;
}
.river {
stroke: #111;
fill: none;
stroke-width: 1px;
}
.caption {
background-color: rgba(100, 200, 200, 0.8);
border: 1px solid #444;
position: fixed;
top: 20px;
left: 20px;
padding: 8px;
}
</style>
</head>
<body>
<div id="map"></div>
<div class="caption"></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoiZW5qYWxvdCIsImEiOiJjaWhtdmxhNTIwb25zdHBsejk0NGdhODJhIn0.2-F2hS_oTZenAWc0BMf_uw'
//Setup mapbox-gl map
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/enjalot/cihmvv7kg004v91kn22zjptsc',
center: [-0.1,51.5119112],
zoom: 11.5,
})
map.scrollZoom.disable()
map.addControl(new mapboxgl.Navigation());
// Setup our svg layer that we can manipulate with d3
var container = map.getCanvasContainer()
var svg = d3.select(container).append("svg")
var path = d3.geo.path()
.projection(function(lonlat, i) {
var p = map.project(new mapboxgl.LngLat(lonlat[0], lonlat[1]))
return [p.x, p.y];
})
d3.json("london-neighborhoods.topojson", function(err, london) {
d3.json("london-rivers.topojson", function(err, rivers) {
//console.log(london.objects['london-neighborhoods-slim'])
var neighborhoods = topojson.feature(london, london.objects['london-neighborhoods-slim']);
var buffered = buffer(neighborhoods, -0.0005, 'degrees')
var riverFeatures = topojson.feature(rivers, rivers.objects['london-rivers']);
var thames = getThames(riverFeatures, 80, 'meters')
//var buffered = buffer(features, -0.0005, 'degrees')
//var sliced = difference(neighborhoods, thames)
//console.log("sliced", sliced)
//console.log("original", features)
//console.log("buffered", buffered)
var land = svg.append("path")
.datum(buffered)
.attr("class", "land")
.attr("d", path);
/*
var riversvg = svg.append("path")
.datum(thames)
.attr("class", "river")
.attr("d", path);
*/
function render() {
land.attr("d", path)
//riversvg.attr("d", path)
}
// re-render our visualization whenever the view changes
map.on("viewreset", function() {
render()
})
map.on("move", function() {
render()
})
// render our initial visualization
render();
map.on("click", function(e) {
console.log("click", e);
var p = {
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [e.lngLat.lng, e.lngLat.lat]
}
};
features.features.forEach(function(feature) {
//buffered.features.forEach(function(feature) {
var isInside = turf.inside(p, feature);
if(isInside) {
console.log(feature);
d3.select(".caption").text(feature.properties.name)
}
})
})
}) })
// from http://blockbuilder.org/armollica/c6c97710ac404e67b6bf
function buffer(featureCollection, distance, unit) {
var features = featureCollection.features
.map(function(feature) {
var buffered = null;
try {
buffered = turf.buffer(feature, distance, unit).features[0];
buffered.properties = feature.properties;
} catch(e) { console.error(e); }
return buffered;
})
.filter(function(feature) { return feature !== null; });
return {
type: "FeatureCollection",
features: features,
properties: null
};
}
function getThames(featureCollection, distance, unit) {
var thames = featureCollection.features.filter(function(feature) {
if(feature.properties.name === "River Thames")
return true;
return false;
})
console.log("thames", thames);
var fc = {
type: "FeatureCollection",
features: thames,
properties: null
};
return buffer(fc, distance, unit)
}
function difference(fcA, fcB) {
var features = [];
fcA.features.forEach(function(a) {
fcB.features.forEach(function(b) {
try {
var diff = turf.erase(a,b);
features.push(diff);
} catch(e) {
}
})
})
return {
type: "FeatureCollection",
features: features,
properties: null
}
}
</script>
</body>
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{"type":"Topology","objects":{"london-rivers":{"type":"GeometryCollection","crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}},"geometries":[{"type":"LineString","properties":{"name":"Bow Creek"},"arcs":[0,1,2]},{"type":"LineString","properties":{"name":"Barking Creek"},"arcs":[3,4]},{"type":"LineString","properties":{"name":"River Lea or Lee"},"arcs":[5,6]},{"type":"LineString","properties":{"name":"Folly Brook"},"arcs":[7]},{"type":"LineString","properties":{"name":"Beverley Brook"},"arcs":[8]},{"type":"LineString","properties":{"name":null},"arcs":[9]},{"type":"LineString","properties":{"name":"Beverley Brook"},"arcs":[10]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[11]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[12]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[13]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[14]},{"type":"LineString","properties":{"name":"Channelsea River"},"arcs":[15,16,17]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[18]},{"type":"LineString","properties":{"name":"Three Mills Wall River"},"arcs":[19]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[20]},{"type":"LineString","properties":{"name":"Old River Lea"},"arcs":[21]},{"type":"LineString","properties":{"name":"City Mill River"},"arcs":[22]},{"type":"LineString","properties":{"name":"St Thomas Creek"},"arcs":[23]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[24,25,26,27,28,29,30]},{"type":"LineString","properties":{"name":"Lee Flood Relief Channel"},"arcs":[31,32]},{"type":"LineString","properties":{"name":null},"arcs":[33,34]},{"type":"LineString","properties":{"name":"Coppermill Stream"},"arcs":[35]},{"type":"LineString","properties":{"name":"River Lea or Lee"},"arcs":[36]},{"type":"LineString","properties":{"name":null},"arcs":[37]},{"type":"LineString","properties":{"name":"River Lea Diversion"},"arcs":[38]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[39,40]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[41,42]},{"type":"LineString","properties":{"name":"Dollis Brook"},"arcs":[43,44]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[45,46,47]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[48]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[49]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[50]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[51,52]},{"type":"LineString","properties":{"name":"Wandle"},"arcs":[53]},{"type":"LineString","properties":{"name":"Three Mills River"},"arcs":[54,55]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[56]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[57]},{"type":"LineString","properties":{"name":"Quaggy"},"arcs":[58]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[59]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[60]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[61]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[62,63]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[64]},{"type":"LineString","properties":{"name":"New River"},"arcs":[65]},{"type":"LineString","properties":{"name":"River Shuttle"},"arcs":[66]},{"type":"LineString","properties":{"name":null},"arcs":[67]},{"type":"LineString","properties":{"name":"New River"},"arcs":[68]},{"type":"LineString","properties":{"name":"New River"},"arcs":[69]},{"type":"LineString","properties":{"name":"Grand Union Canal"},"arcs":[70]},{"type":"LineString","properties":{"name":"River Lea (or Lee) Diversion"},"arcs":[71]},{"type":"LineString","properties":{"name":null},"arcs":[72]},{"type":"LineString","properties":{"name":null},"arcs":[73]},{"type":"LineString","properties":{"name":null},"arcs":[74]},{"type":"LineString","properties":{"name":null},"arcs":[75]},{"type":"LineString","properties":{"name":null},"arcs":[76]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[77]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[78]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[79,80]},{"type":"LineString","properties":{"name":null},"arcs":[81]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[82]},{"type":"LineString","properties":{"name":"New River"},"arcs":[83]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[84]},{"type":"LineString","properties":{"name":"Abbey Creek"},"arcs":[85]},{"type":"LineString","properties":{"name":"Roding"},"arcs":[86]},{"type":"LineString","properties":{"name":null},"arcs":[87]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[88]},{"type":"LineString","properties":{"name":"New River"},"arcs":[89]},{"type":"LineString","properties":{"name":"New River"},"arcs":[90]},{"type":"LineString","properties":{"name":"New River"},"arcs":[91]},{"type":"LineString","properties":{"name":"New River"},"arcs":[92]},{"type":"LineString","properties":{"name":"New River"},"arcs":[93]},{"type":"LineString","properties":{"name":null},"arcs":[94]},{"type":"LineString","properties":{"name":"Edgware Brook"},"arcs":[95]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[96]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[97]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[98]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[99]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[100]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[101]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[102]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[103]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[104,105]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[106]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[107]},{"type":"LineString","properties":{"name":"Silk Stream"},"arcs":[108]},{"type":"LineString","properties":{"name":"Dean's Brook"},"arcs":[109,110]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[111]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[112]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[113]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[114]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[115]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[116]},{"type":"LineString","properties":{"name":"Seven Kings Water"},"arcs":[117]},{"type":"LineString","properties":{"name":"River Brent"},"arcs":[118]},{"type":"LineString","properties":{"name":"River Brent"},"arcs":[119]},{"type":"LineString","properties":{"name":"Pool River"},"arcs":[120]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[121]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[122]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[123]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[124]},{"type":"LineString","properties":{"name":"River Quaggy"},"arcs":[125]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[126]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[127]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[128]},{"type":"LineString","properties":{"name":"River Cray"},"arcs":[129,130]},{"type":"LineString","properties":{"name":null},"arcs":[131]},{"type":"LineString","properties":{"name":"River Shuttle"},"arcs":[132]},{"type":"LineString","properties":{"name":"River Shuttle"},"arcs":[133]},{"type":"LineString","properties":{"name":"River Shuttle"},"arcs":[134]},{"type":"LineString","properties":{"name":"River Shuttle"},"arcs":[135]},{"type":"LineString","properties":{"name":"New River"},"arcs":[136]},{"type":"LineString","properties":{"name":"New River"},"arcs":[137]},{"type":"LineString","properties":{"name":"New River"},"arcs":[138]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[139]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[140]},{"type":"LineString","properties":{"name":"The Moselle River"},"arcs":[141]},{"type":"LineString","properties":{"name":"Pymme's Brook"},"arcs":[142]},{"type":"LineString","properties":{"name":"Burnt Oak Brook"},"arcs":[143]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[144]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[145]},{"type":"LineString","properties":{"name":null},"arcs":[146]},{"type":"LineString","properties":{"name":null},"arcs":[147]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[148]},{"type":"LineString","properties":{"name":"Mutton Brook"},"arcs":[149]},{"type":"LineString","properties":{"name":"Mutton Brook"},"arcs":[150]},{"type":"LineString","properties":{"name":"Mutton Brook"},"arcs":[151]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[152]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[153]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[154]},{"type":"LineString","properties":{"name":"Burnt Oak Brook"},"arcs":[155]},{"type":"LineString","properties":{"name":"Waterworks River"},"arcs":[156]},{"type":"LineString","properties":{"name":"Three Mills River"},"arcs":[157]},{"type":"LineString","properties":{"name":null},"arcs":[158]},{"type":"LineString","properties":{"name":null},"arcs":[159]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[160]},{"type":"LineString","properties":{"name":"New River"},"arcs":[161]},{"type":"LineString","properties":{"name":"New River"},"arcs":[162]},{"type":"LineString","properties":{"name":"Beverley Brook"},"arcs":[163]},{"type":"LineString","properties":{"name":"Beverley Brook"},"arcs":[164]},{"type":"LineString","properties":{"name":"New River"},"arcs":[165]},{"type":"LineString","properties":{"name":"New River"},"arcs":[166]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[167]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[168]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[169]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[170]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[171]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[172,173]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[174]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[175]},{"type":"LineString","properties":{"name":"Old River Lea"},"arcs":[176,177]},{"type":"LineString","properties":{"name":"The Fleet"},"arcs":[178]},{"type":"LineString","properties":{"name":null},"arcs":[179]},{"type":"LineString","properties":{"name":"Coppermill Stream"},"arcs":[180]},{"type":"LineString","properties":{"name":"River Brent"},"arcs":[181]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[182]},{"type":"LineString","properties":{"name":null},"arcs":[183]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[184]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[185]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[186]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[187,188,189]},{"type":"LineString","properties":{"name":"Three Mills Lock"},"arcs":[190]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[191]},{"type":"LineString","properties":{"name":"Prescott Channel"},"arcs":[192]},{"type":"LineString","properties":{"name":"River Fleet"},"arcs":[193]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[194]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[195]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[196]},{"type":"LineString","properties":{"name":"River Wandle"},"arcs":[197,198]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[199]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[200]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[201]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[202,203]},{"type":"LineString","properties":{"name":"Westbourne"},"arcs":[204]},{"type":"LineString","properties":{"name":"Westbourne"},"arcs":[205]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[206,207]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[208]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[209,210,211]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[212]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[213,214,215,216]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[217]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[218]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[219,220]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[221]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[222]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[223]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[224]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[225]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[226]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[227]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[228]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[229]},{"type":"LineString","properties":{"name":"Burnt Oak Brook"},"arcs":[230]},{"type":"LineString","properties":{"name":"Burnt Oak Brook"},"arcs":[231]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[232]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[233]},{"type":"LineString","properties":{"name":"Brent"},"arcs":[234]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[235]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[236,237,238]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[239]},{"type":"LineString","properties":{"name":"River Roding"},"arcs":[240]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[241]},{"type":"LineString","properties":{"name":"River Thames"},"arcs":[242]},{"type":"LineString","properties":{"name":"River Lea"},"arcs":[243]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[244]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[245]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[246]},{"type":"LineString","properties":{"name":"Loxford Water"},"arcs":[247]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[248]},{"type":"LineString","properties":{"name":"River Ravensbourne"},"arcs":[249]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[250]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[251]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[252]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[253]},{"type":"LineString","properties":{"name":"Edgwarebury Brook"},"arcs":[254]},{"type":"LineString","properties":{"name":"Dollis Brook"},"arcs":[255]},{"type":"LineString","properties":{"name":"Dollis Brook"},"arcs":[256]},{"type":"LineString","properties":{"name":null},"arcs":[257]},{"type":"LineString","properties":{"name":"River Brent"},"arcs":[258]},{"type":"LineString","properties":{"name":"Pymme's Brook"},"arcs":[259]},{"type":"LineString","properties":{"name":"Pymme's 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