lasFileReader
LAS or LAZ file reader
Description
The LAS file format is an industry-standard binary format for storing lidar data, developed and maintained by the American Society for Photogrammetry and Remote Sensing (ASPRS). The LAZ file format is a compressed version of the LAS file format.
A LAS file contains a public header, which has lidar metadata, followed by lidar point records. Each point record contains attributes such as 3-D coordinates, intensity and GPS timestamp.
A lasFileReader object stores the metadata present in the LAS or LAZ file
as read-only properties. The object function, readPointCloud,
uses these properties to read point cloud data from the file.
Creation
Description
lasReader = lasFileReader(fileName)fileName, and stores it
as properties of an output lasFileReader object,
lasReader. The fileName input sets the
FileName property.
Properties
Object Functions
readPointCloud | Read point cloud data from a LAS or LAZ file |
Examples
Read Point Cloud Data from LAZ File
Create a lasFileReader object for a LAZ file. Then, use the readPointCloud function to read point cloud data from the LAZ file and generate a pointCloud object.
Create a lasFileReader object to access the LAZ file data.
path = fullfile(toolboxdir('lidar'),'lidardata', ... 'las','aerialLidarData.laz'); lasReader = lasFileReader(path);
Read point cloud data from the LAZ file using the readPointCloud function.
ptCloud = readPointCloud(lasReader);
Visualize the point cloud.
figure pcshow(ptCloud.Location)
Visualize Point Cloud Based on Classification Data from LAZ File
Segregate and visualize point cloud data based on classification data from a LAZ file.
Create a lasFileReader object to access data from the LAZ file.
path = fullfile(toolboxdir('lidar'),'lidardata', ... 'las','aerialLidarData.laz'); lasReader = lasFileReader(path);
Read point cloud data and associated classification point attributes from the LAZ file using the readPointCloud function.
[ptCloud,pointAttributes] = readPointCloud(lasReader,'Attributes','Classification');
Color the points based on their classification attributes.
colorData = reshape(label2rgb(pointAttributes.Classification),[],3);
Visualize the color-coded point cloud.
figure pcshow(ptCloud.Location,colorData)
