TypeScript turf.featureCollection函数代码示例

import * as turf from '@turf/turf'
import {writer, reader} from 'geojson-writer'

const collection = turf.featureCollection([])
const data = reader('ottawa-address.geojson')

data.features.map(feature => {
  feature.properties.source = 'City of Ottawa'
  if (feature.properties['survey:date']) { delete feature.properties['survey:date'] }
  collection.features.push(feature)
})

console.log('writing', collection.features.length)
writer('ottawa-address-clean.geojson', collection)

// -- Test kinks --
turf.kinks(polygon1)

// -- Test lineSlice --
turf.lineSlice(point1, point2, lineString1)

// -- Test pointOnLine --
turf.pointOnLine(lineString1, point1)

///////////////////////////////////////////
// Tests Helper
///////////////////////////////////////////

// -- Test featurecollection --
turf.featureCollection([point1, point2])
turf.featureCollection([point1, polygon1])
turf.featureCollection([polygon1, polygon2])
turf.featureCollection([lineString1, polygon1])
turf.featureCollection([lineString1, point1])

// -- Test feature --
turf.feature(point1)
turf.feature(polygon1)
turf.feature(lineString1)

// -- Test lineString --
turf.lineString(lineString1.geometry.coordinates)
turf.lineString(lineString1.geometry.coordinates, properties)

// -- Test multiLineString --

import * as fs from 'fs'
import * as changeCase from 'change-case'
import * as path from 'path'
import { isUndefined } from 'lodash'
import { featureCollection, lineString } from '@turf/turf'

const features: GeoJSON.FeatureCollection<GeoJSON.MultiLineString> = require(path.join(__dirname, 'source', 'lake-county-roads.json'))
const results: GeoJSON.FeatureCollection<GeoJSON.LineString> = featureCollection([])
const suffixLookup: any = require('./suffix.json')
const directionsLookup: any = require('./directions.json')

features.features.map(feature => {
    feature.geometry.coordinates.map(coords => {
        const name = changeCase.title(feature.properties['BaseStreet'])
        const suffix = suffixLookup[feature.properties['SuffixType']]
        const direction = directionsLookup[feature.properties['PrefixDire']]
        const ref = feature.properties['SegID']
        const properties: any = {
            source: 'Lake County',
            highway: 'residential',
            maxspeed: feature.properties['SpeedLimit'] ? `${ feature.properties['SpeedLimit'] } mph` : undefined,
            name: [name, suffix, direction].join(' ').trim()
        }
        if (ref) {
            properties.ref = ref
            properties['source:ref'] = 'Lake County'
        }
        results.features.push(lineString(coords, properties))
    })
})

import * as fs from 'fs'
import * as path from 'path'
import * as Baby from 'babyparse'
import * as turf from '@turf/turf'
import * as yml from 'js-yaml'
import { range, capitalize, keys } from 'lodash'

const parsed = Baby.parseFiles(path.join(__dirname, 'gtfs', 'stops.txt'))
const headers = parsed.data.shift()
const features: GeoJSON.FeatureCollection<GeoJSON.Point> = turf.featureCollection([])
const data: string[][] = parsed.data

function parseRef(ref: string) {
    if (ref) {
        if (ref.length === 4) { return ref }
        else if (ref.length === 3) {
            //console.log('WARNING - Padded reference number', ref)
            return `0${ ref }`
        }
    }
}

function parseName(name: string) {
    if (name) {
        const words: string[] = []
        name.split(/[ ]+/g).map(word => {
            word = word.replace(/DR\./, 'Drive')
            word = word.replace(/ST\./, 'Street')
            word = word.replace(/RD\./, 'Road')
            word = word.replace(/W\./, 'West')
            word = word.replace(/\\/g, '/')

import { geojson2osm } from 'geojson2osm'
import { merge } from 'lodash'
import * as fs from 'fs'
import * as path from 'path'
import * as turf from '@turf/turf'

// Load source dataset
const source: GeoJSON.FeatureCollection<GeoJSON.Point> = require(path.join(__dirname, 'oc-transpo-stops.json'))

// Load overpass data using GeoJSON & print results using `out meta`
// http://overpass-turbo.eu/s/iuT
const overpass: GeoJSON.FeatureCollection<GeoJSON.Point> = require(path.join(__dirname, 'oc-transpo-stops-overpass.json'))

// Set up index of source dataset
const index: any = {} 
source.features.map(feature => index[feature.properties.ref] = feature.properties)

// Merge existing data with new data
const container: GeoJSON.FeatureCollection<GeoJSON.Point> = turf.featureCollection([])
overpass.features.map(feature => {
  feature.properties = merge(feature.properties, index[feature.properties.ref])
  feature.properties['@action'] = 'modify'
  feature.properties['@id'] = feature.properties['@id'].replace(/node\//, '') // Remove extra ID syntax created by Overpass
  delete feature.properties['@timestamp'] // Breaks geojson2osm
  container.features.push(feature)
})

// Save OSM File
fs.writeFileSync(path.join(__dirname, 'oc-transpo-stops-gtfs.osm'), geojson2osm(container))

  feature.properties = {
    building: 'yes',
    source: 'City of Ottawa',
  }
  const uniqueOuter: any = {}
  const uniqueInner: any = {}

  feature.geometry.coordinates[0].map(coord => uniqueOuter[coord.map(x => Number(x.toFixed(5))).join(',')] = true)
  if (feature.geometry.coordinates[1]) { feature.geometry.coordinates[1].map(coord => uniqueInner[coord.map(x => Number(x.toFixed(5))).join(',')] = true) }

  if (count % 1000 === 0) { console.log('processed', count, Object.keys(uniqueOuter).length, Object.keys(uniqueInner).length) }

  // Remove Inner Polygon
  if (Object.keys(uniqueInner).length === 2 || Object.keys(uniqueInner).length === 1) {
    console.log('remove inner polygon', JSON.stringify(feature, null))
    fs.writeFileSync('last-issue.geojson', JSON.stringify(feature, null, 2))
    feature.geometry.coordinates = feature.geometry.coordinates.slice(0, 1)
  }

  // Don't simplify two vertices
  if (Object.keys(uniqueOuter).length > 2) {
    feature = turf.simplify(feature, 0.000001, true)
    collection.push(feature)
  }
  count ++
}

console.log('Total:', count, collection.length)
console.log('writting')
writer('ottawa-buildings-clean.geojson', turf.featureCollection(collection))

import * as concaveman from 'concaveman'
import * as helpers from 'geojson-helpers'
import * as turf from '@turf/turf'

const data = './halifax-buildings.json'
const geojson: GeoJSON.FeatureCollection<any> = require(data)
const points: Array<Array<number>> = []
geojson.features.map(feature => {
  turf.explode(feature).features.map(point => {
    points.push(point.geometry.coordinates)
  })
})
const extent = turf.polygon([concaveman(points)])
const buffer = turf.buffer(extent, 500, 'meters')
const simple: any = turf.simplify(buffer, 0.001, false)
helpers.writeFileSync('./extent.geojson', turf.featureCollection([extent]))
helpers.writeFileSync('./buffer.geojson', turf.featureCollection([buffer]))
helpers.writeFileSync('./simple.geojson', turf.featureCollection([simple]))

const data: GeoJSON.FeatureCollection<GeoJSON.Polygon> = reader('ottawa-parcels.geojson')

let count = 0

console.log('start')
for (let feature of data.features) {
  const road: string = feature.properties['ROAD_NAME']
  const suffix: string = feature.properties['SUFFIX']
  const street = (road && suffix) ? road + ' ' + suffix : road
  const housenumber = feature.properties['ADDRESS_NU']

  feature.properties = {
    'addr:housenumber': housenumber,
    'addr:street': street,
    ref: feature.properties['PI_PARCEL_'],
    source: 'City of Ottawa'
  }

  const unique: any = {}
  meta.coordEach(feature, coord => unique[coord.join(',')] = true)
  if (Object.keys(unique).length > 2) {
    feature = turf.simplify(feature, 0.000001, true)
    collection.push(feature)
  }
  count ++
  if (count % 1000 === 0) { console.log('processed', count, feature.geometry.coordinates[0].length) }
}

console.log('writting')
writer('ottawa-parcels-simplify.geojson', turf.featureCollection(collection))