README.md

lasparser

LAS File parser based upon itowns old code. Uses plain javascript. This library is adopted from: https://github.com/iTowns/itowns-legacy/blob/ea94e8ed246d3bc5b567cfdb50e2151ba58cc7d3/src/LasReader.js The DataView code is primarily taken from https://github.com/finscn/fast-dataview

The library supports las version 1.0-1.4.

This code is built around the concept that it should be easy to use in the browser as well as on a server with no modification and needing little to no external libraries.

The sample usage below requires laszip to be installed from lastools (https://rapidlasso.com/lastools/)

The library has a single dependency of fast-dataview. This is simply used for nodejs cross compatability with DataView for browswers but can potentially be removed later.

var fname = 'USGS_LPC_CA_LosAngeles_2016_L4_6477_1857c_LAS_2018.laz',
  { exec } = require('child_process');

var lasreader = require('./lasreader'),
  ge = console.log;
exec('laszip -i ' + fname + ' -stdout', {maxBuffer: 1024 * 5000000, encoding: 'buffer'}, handle);

function handle(err, stdout, stderr){
  var lasobj = lasreader(stdout),
    p = 0, len = lasobj.header.numberOfPointRecords,
    laspoint;
  for (; p < 30000000; p++) {
    laspoint = lasobj.getPointData(p);
    ge(p, laspoint);
    if (laspoint.X === 0 && laspoint.Z === 0) {
      ge(p, laspoint);
      break;
    }
  }
  ge(lasobj.header);
}