las-header

Lightweight JavaScript library for reading the header of LAS/LAZ files

Install

``
$ npm i las-header
`

Usage

`
const lasHeader = require('las-header');
or
import lasHeader from 'las-header';
`

From File object
`
const header = await lasHeader.readFileObject({input: files[0]});
`

From URL (painfully slow, though)
`
const header = await lasHeader.readUrl({input: 'https://my.domain.com/file.laz'});
`

From local LAS/LAZ file (Node only)
`
const header = lasHeader.readLocalFile({input: 'path/to/file.laz'});
`

Sample output:
`
{
FileSignature: 'LASF',
FileSoureceID: 0,
GlobalEncoding: 0,
VersionMajor: 1,
VersionMinor: 2,
SystemIdentifier: 'PDAL',
GeneratingSoftware: 'PDAL 1.5.0 (424c25)',
CreationDay: 50,
CreationYear: 2018,
HeaderSize: 227,
OffsetToPointData: 621,
NumberOfVariableLengthRecords: 4,
PointDataFormatID: 131,
PointDataRecordLength: 34,
NumberOfPoints: 24318764,
NumberOfPointByReturn: 0,
ScaleFactorX: 0.001,
ScaleFactorY: 0.001,
ScaleFactorZ: 0.001,
OffsetX: 475000,
OffsetY: 7212000,
OffsetZ: 0,
MaxX: 475111.573,
MinX: 474773.203,
MaxY: 7212849.161,
MinY: 7212550.753,
MaxZ: 38.608000000000004,
MinZ: -195.541,
epsg: 3133
}
``