Elevation Gain in GPX files
Calculates the distance traveled (linear reference) along a LINESTRING Z geometry, supplied in WKT format. Returns a LINESTRING ZM geometry with the M dimension populated.
The final result is in the same units as the original source data.. likely meters if sourced from Strava.
Installing with NPM
npm i --save geo-calc-line-references
Example
// load dependencies
const fs = require('fs')
const gpxCalcLineReferences = require('./gpxCalcLineReferences.js')
// open sample file and load WKT
const sampleWKT = fs.readFileSync('./sample_data/Sample_Stintson_Beach.wkt', 'utf8')
// calculate linear references and save into WKT with 4th "M" dimension
const referencedWKT = gpxCalcLineReferences( sampleWKT )
console.log(referencedWKT)