Created
February 5, 2021 14:50
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BRouter rd5 grid
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| var fs = require("fs"), | |
| topojson = require("topojson"), | |
| filesize = require('file-size'); | |
| // https://brouter.de/brouter/segments4/ | |
| var path = 'Index of _brouter_segments4_.html', | |
| gridSize = 5; // degrees | |
| var entryList = []; | |
| function readHtmlDirList(path) { | |
| var lines = fs.readFileSync(path).toString().split('\n'); | |
| var i, matches, entry, | |
| //<a href="E0_N10.rd5">E0_N10.rd5</a> 04-Feb-2021 01:03 7620723 | |
| regex = /\s*<a href=\"(.*)\.rd5\".*<\/a>\s+(\S+)\s(\S+)\s+(\S+)\s*/; | |
| for (i = 0; i < lines.length; i++) { | |
| matches = lines[i].match(regex); | |
| if (matches) { | |
| entry = { | |
| name: matches[1], | |
| date: matches[2], | |
| //time: matches[3], | |
| size: filesize(+matches[4], { fixed: 0 }).human() | |
| }; | |
| entryList.push(entry); | |
| } | |
| } | |
| } | |
| function toGeoJson() { | |
| var properties, matches, lat, lon | |
| features = []; | |
| function toPolygon(lat, lon) { | |
| var n = lat + gridSize, | |
| w = lon, | |
| s = lat, | |
| e = lon + gridSize; | |
| return [ | |
| [ [w, n], [e, n], [e, s], [w, s], [w, n] ] | |
| ]; | |
| } | |
| for (i = 0; i < entryList.length; i++) { | |
| properties = entryList[i]; | |
| // W180_S85 | |
| matches = properties.name.match(/(E|W)(\d*)_(N|S)(\d*)/); | |
| lon = parseInt(matches[2]) * ( matches[1] === 'E' ? 1 : -1 ); | |
| lat = parseInt(matches[4]) * ( matches[3] === 'N' ? 1 : -1 ); | |
| features.push({ | |
| "type": "Feature", | |
| "geometry": { | |
| "type": "Polygon", | |
| "coordinates": toPolygon(lat, lon) | |
| }, | |
| "properties": properties | |
| }); | |
| } | |
| var geoJson = { | |
| "type": "FeatureCollection", | |
| "features": features | |
| }; | |
| return geoJson; | |
| } | |
| function toTopoJson(geoJson) { | |
| return topojson.topology({ | |
| collection: geoJson | |
| }, { | |
| 'verbose': true, | |
| 'quantization': false, | |
| 'stitch-poles': false, | |
| 'property-transform': function (feature) { | |
| return feature.properties; | |
| } | |
| }); | |
| } | |
| function writeJson(path, obj) { | |
| fs.writeFile(path, JSON.stringify(obj), function(err) { | |
| if (err) { | |
| return console.error(err); | |
| } | |
| console.log('created file "' + path + '"'); | |
| }); | |
| } | |
| readHtmlDirList(path); | |
| var geoJson = toGeoJson(); | |
| writeJson('grid.geojson', geoJson); | |
| var topoJson = toTopoJson(geoJson); | |
| writeJson('grid.topojson', topoJson); |
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| { | |
| "name": "brouter-rd5-grid", | |
| "version": "0.1.0", | |
| "description": "Creates a 5° grid for the areas covered by BRouter rd5 routing data files as GeoJSON and TopoJSON", | |
| "dependencies": { | |
| "file-size": "^1.0.0", | |
| "topojson": "^1.6.19" | |
| }, | |
| "license": "MIT" | |
| } |
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