123 lines
4.6 KiB
JavaScript
123 lines
4.6 KiB
JavaScript
'use strict';
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const fs = require('fs'),
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{ Errors } = require('./constants'),
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{ AppInputError, AppParamError } = require('./app_error');
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function splitDMS(dms) {
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if (!dms || dms.length !== 13) AppInputError.throw(Errors.INVALID_DMS);
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const fields = dms.trim().split(new RegExp('\\s+')).map(it => it.trim());
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return {
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deg: fields[0],
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min: fields[1],
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sec: fields[2].slice(0, fields[2].length - 1),
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hem: fields[2].slice(-1)
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};
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}
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function trimProps(objectToTrim) {
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for (const key in objectToTrim) {
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if (objectToTrim[key].constructor && objectToTrim[key].constructor == Object)
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trimProps(objectToTrim[key]);
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else if (objectToTrim[key].trim)
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objectToTrim[key] = objectToTrim[key].trim();
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}
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}
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function readObstacles(filePath, cb) {
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//# .Dat files have fixed-width columns; the data is always in the same position within a row
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fs.readFile(filePath, 'utf8', function (err, data) {
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// fs.truncateSync(testRes);
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if (err) throw err;
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let failed = false;
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let lines = data.toString().split('\n');
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let obs = [];
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let startLat = -1, startLatDeg = -1, startLonDeg = -1, startAGL = -1, startHT = -1, startType = -1, startAct = -1; // startASML = -1;
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try {
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for (let i = 0; i < lines.length; i++) {
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if (failed)
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break;
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let line = lines[i];
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let latDms, lonDms, ob = {};
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// Skip the first 4 rows (they include poorly formatted header information)
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if (i === 1) {
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startLat = line.toUpperCase().indexOf("LATITUDE");
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startAGL = line.toUpperCase().indexOf("AGL");
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// startASML = line.toUpperCase().indexOf("AMSL");
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startAct = line.toUpperCase().indexOf("ACTION");
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} else if (i === 2) {
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startLatDeg = line.toUpperCase().indexOf("DEG");
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startLonDeg = line.toUpperCase().indexOf("DEG", startLatDeg + 1);
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startHT = line.toUpperCase().indexOf("HT");
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startType = line.toUpperCase().indexOf("TYPE");
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}
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if (i < 4 || line.trim().length === 0) continue;
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// Verify file format, then to know where to get important fields
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if (!(startLat >= startLatDeg && startAGL === startHT) || (!startLat || !startLatDeg || !startLonDeg || !startAGL || !startHT || !startType || !startAct))
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AppParamError.throw(Errors.INVALID_OBSTACLE_FILE_FORMAT);
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ob.ors = line.slice(0, 9); // The first 9 characters of the row represent the Obstacle number
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ob.v = line.slice(10, 11);
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latDms = splitDMS(line.substring(startLatDeg, startLatDeg + 13));
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ob.latDeg = latDms.deg;
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ob.latMin = latDms.min;
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ob.latSec = latDms.sec;
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ob.latHem = latDms.hem;
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lonDms = splitDMS(line.substring(startLonDeg, startLonDeg + 13));
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ob.lonDeg = lonDms.deg;
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ob.lonMin = lonDms.min;
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ob.lonSec = lonDms.sec;
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ob.lonHem = lonDms.hem;
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ob.type = line.substring(startType, startType + 17);
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ob.agl = line.substring(startAGL, startAGL + 5);
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ob.amsl = line.substring(startAGL + 6, (startAGL + 6) + 5);
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ob.action = line.substring(startAct, startAct + 3);
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//Convert DMS to Decimal Degrees (N vs. S determines if the value is positive or negative)
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if (ob.latHem == "N")
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ob.latitude = (parseFloat(ob.latDeg) + (parseFloat(ob.latMin) / 60) + (parseFloat(ob.latSec) / 3600));
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else
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ob.latitude = -1 * (parseFloat(ob.latDeg) + (parseFloat(ob.latMin) / 60) + (parseFloat(ob.latSec) / 3600));
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// Convert DMS to Decimal Degrees (E vs. W determines if the value is positive or negative)
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if (ob.lonHem == "E")
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ob.longitude = (parseFloat(ob.lonDeg) + (parseFloat(ob.lonMin) / 60) + (parseFloat(ob.lonSec) / 3600));
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else
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ob.longitude = -1 * (parseFloat(ob.lonDeg) + (parseFloat(ob.lonMin) / 60) + (parseFloat(ob.lonSec) / 3600));
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trimProps(ob);
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ob.latitude = ob.latitude.toFixed(7);
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ob.longitude = ob.longitude.toFixed(7);
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const geoObstacle = {
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properties: {
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name: ob.ors,
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type: ob.type,
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agl: parseFloat(ob.agl), // Above ground level in feet
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amsl: parseFloat(ob.amsl), // Average mean sea level in feet
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},
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geometry: {
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type: 'Point',
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coordinates: [ob.longitude, ob.latitude]
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}
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};
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obs.push(geoObstacle);
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}
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return cb(null, obs.slice(0));
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} catch (err) {
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// debug(err.message, "\n", err.stack);
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failed = true;
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return cb(err.message);
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}
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// fs.appendFileSync(testRes, JSON.stringify(obs, null, 2));
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});
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}
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module.exports = {
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readObstacles
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} |