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 feature::Feature;

pub use header::Header;

pub use point::Point;

pub use reader::Read;

pub use reader::Reader;

pub use vlr::Vlr;

pub use writer::Write;

pub use 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.
Builder	Builds headers.
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 Definitions

Result

Crate-specific result type.