Created
July 26, 2019 04:10
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GeoJsonのデータをgl.linesで使えるjsonファイルに書き出し
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import fs from 'fs'; | |
import jsonfile from 'jsonfile'; | |
import { IGeoJson } from './geo-json'; | |
const eartDataUrl ='earth-line.json'; | |
fs.readFile('./json/ne_110m_land.json', 'utf-8', (err, data) => { | |
const geoData = JSON.parse(data) as IGeoJson; | |
const pointData = []; | |
const indices = []; | |
const vertices = []; | |
let cnt = 0; | |
for (const feature of geoData.features) { | |
if (cnt > 0) { | |
// break; | |
} | |
for (const coordiantes of feature.geometry.coordinates) { | |
const pointArr = []; | |
for (const coordinate of coordiantes) { | |
const vec3 = lonLatToVec3(coordinate[0], coordinate[1]); | |
pointArr.push(vec3); | |
} | |
pointData.push(pointArr); | |
} | |
cnt = cnt + 1; | |
} | |
let startCnt = 0; | |
for (const pointArr of pointData) { | |
const pointSize = pointArr.length; | |
for (const point of pointArr) { | |
vertices.push(point[0], point[1], point[2]); | |
} | |
for (let ii = 0; ii < pointSize; ii = ii + 1) { | |
const index0 = startCnt + ii; | |
const index1 = startCnt + ((ii + 1) % pointSize); | |
indices.push(index0, index1); | |
} | |
startCnt = startCnt + pointArr.length; | |
} | |
const polygonData = { vertices: vertices, indices: indices }; | |
jsonfile.writeFile(eartDataUrl, polygonData, () => {}); | |
}); | |
function lonLatToVec3(_lng: number, _lat: number) { | |
const lng = (_lng / 180) * Math.PI; | |
const lat = Math.PI / 2 - (_lat / 180) * Math.PI; | |
const x = Math.sin(lat) * Math.sin(lng); | |
const y = Math.cos(lat); | |
const z = Math.sin(lat) * Math.cos(lng); | |
return [parseFloat(x.toFixed(3)), parseFloat(y.toFixed(3)), parseFloat(z.toFixed(3))]; | |
} |
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