Crate las

Read and write ASPRS LAS point cloud data.

Reading

Create a Reader from a Path:

use las::Reader;
let reader = Reader::from_path("tests/data/autzen.las").unwrap();

Or anything that implements Read:

use std::io::BufReader;
use std::fs::File;
use las::Reader;
let read = BufReader::new(File::open("tests/data/autzen.las").unwrap());
let reader = Reader::new(read).unwrap();

Prefer BufRead

Your performance will be better if your Read is actually a BufRead. Reader::from_path takes care of this for you, but Reader::new doesn’t.

Read points

Read points one-by-one with Reader::read:

use las::{Read, Reader};
let mut reader = Reader::from_path("tests/data/autzen.las").unwrap();
let point = reader.read().unwrap().unwrap();

Or iterate over all points with Reader::points:

use las::{Read, Reader};
let mut reader = Reader::from_path("tests/data/autzen.las").unwrap();
for wrapped_point in reader.points() {
    let point = wrapped_point.unwrap();
    println!("Point coordinates: ({}, {}, {})", point.x, point.y, point.z);
    if let Some(color) = point.color {
        println!("Point color: red={}, green={}, blue={}",
            color.red,
            color.green,
            color.blue,
        );
    }
}

Writing

Create a Writer from a Write and a Header:

use std::io::Cursor;
use las::{Writer, Header};
let write = Cursor::new(Vec::new());
let header = Header::default();
let writer = Writer::new(write, header).unwrap();

You can also write out to a path (automatically buffered with BufWriter):

use las::Writer;
let writer = Writer::from_path("/dev/null", Default::default());

Use a Builder to customize the las data:

use std::io::Cursor;
use las::{Writer, Builder};
use las::point::Format;

let mut builder = Builder::from((1, 4));
builder.point_format = Format::new(2).unwrap();
let header = builder.into_header().unwrap();

let write = Cursor::new(Vec::new());
let writer = Writer::new(write, header).unwrap();

If compiled with laz you can compress the data written

use std::io::Cursor;
use las::{Writer, Builder};
use las::point::Format;

let mut builder = Builder::from((1, 4));
builder.point_format = Format::new(2).unwrap();
// asking to compress data
builder.point_format.is_compressed = true;
let header = builder.into_header().unwrap();

let write = Cursor::new(Vec::new());
let is_compiled_with_laz = cfg!(feature = "laz");


let result =  Writer::new(write, header);
if is_compiled_with_laz {
    assert_eq!(result.is_ok(), true);
} else {
   assert_eq!(result.is_err(), true);
}

The from_path will use the extension of the output file to determine wether the data should be compressed or not ‘laz’ => compressed ‘las’ => not compressed

Prefer BufWrite

Just like the Reader, your performance will improve greatly if you use a BufWrite instead of just a Write.

Write points

Write points one at a time:

use std::io::Cursor;
use las::{Write, Writer, Point};
let mut writer = Writer::default();
let point = Point { x: 1., y: 2., z: 3., ..Default::default() };
writer.write(point).unwrap();

Re-exports

• pub use crate::feature::Feature;
• pub use crate::header::Builder;
• pub use crate::header::Header;
• pub use crate::point::Point;
• pub use crate::reader::Read;
• pub use crate::reader::Reader;
• pub use crate::vlr::Vlr;
• pub use crate::writer::Write;
• pub use crate::writer::Writer;

Modules

• feature
  Programatically determine whether a las version supports a feature.
• header
  A Header describes the configuration and properties of las data.
• point
  Attributed three-dimensional points.
• raw
  Raw structures that map directly to their definitions in the las format specifications.
• reader
  Read las points.
• vlr
  Variable length records are used to store additional metadata not defined in the header.
• writer
  Write las points.

Structs

• Bounds
  Minimum and maximum bounds in three dimensions.
• Color
  A RGB color value.
• Transform
  A scale and an offset that transforms xyz coordinates.
• Vector
  An xyz collection.
• Version
  LAS version.

Enums

• Error
  Crate-specific error enum.
• GpsTimeType
  The meaning of GPS time in the point records.

Type Aliases

• Result
  Crate-specific result type.