LAS LiDAR Binary (.LAS, .LAZ) File Description

The ASPRS LiDAR LAS binary file format stores 3D point data. LiDAR stands for Light Detection and Ranging data. This data is generally created by software which combines GPS, IMU, and laser pulse range data to produce X, Y, and Z point data. To use binary LiDAR data, click File | Open and select the LAS file or click File | Import in the worksheet window.

Grapher imports compressed (.LAZ) and uncompressed LAS LiDAR binary files.

File Format

The format contains binary data consisting of a header block, variable length records, and point data. All data is in little-endian format. The header block consists of a public block followed by variable length records. The public block contains generic data such as point numbers and coordinate bounds. The variable length records contain variable types of data including projection information, metadata, and user application data.

Currently, Grapher imports 1.0, 1.1, 1.2, and 1.3 format LAS files. These can contain up to 32 codes.

Classification Number Meaning
0 Created, never classified
1 Unclassified
2 Ground
3 Low Vegetation
4 Medium Vegetation
5 High Vegetation
6 Building
7 Low Point (noise)
8 Model Key-point
9 Water
10 Rail
11 Road Surface
12 Reserved
13 Wire - Guard (Shield)
14 Wire - Conductor (Phase)
15 Transmission Tower
16 Wire - Structure Connector (e.g. Insulator)
17 Bridge Deck
18 High Noise
19-32 Reserved

Import Options Dialog

See LiDAR Import Filtering Dialog

Import Automation Options

See LiDAR Import Automation Options

See Also

File Format Chart

Import - Worksheet

LiDAR Import Filtering Dialog