Contents
What is the Las check function in LIDR?
The las_check () function performs an inspection of LAScatalog objects for file consistency. For a deep (and longer) inspection of each file use deep = TRUE. This will sequentially load each file entirely. It’s thus important to be sure you have enough memory to manage this.
How is lidar used for data manipulation and visualization?
Airborne LiDAR (Light Detection and Ranging) interface for data manipulation and visualization. Read/write ‘las’ and ‘laz’ files, computation of metrics in area based approach, point filtering, artificial point reduction, classification from geographic data, normalization, individual tree segmentation and other manipulations.
How does LIDR use laslib to read files?
Under the hood lidR relies on LASlib to read files and inherits of the capability to leverage the use of LAX files developed by Martin Isenburg. While extracting hundreds of plots from hundreds of files may take many seconds, the use of index files can reduce processing to few seconds.
What do you need to know about LIDR package?
The lidR package provides a powerful and versatile set of tools to work with collections of files and enables the application of workflow with an automatic management of tile buffering, on disk storage, parallelization of tasks and so on.
What are the steps in processing lidar data?
Processing topographic Lidar data requires two major steps a) an internal quality check of the raw data and b) an external quality check. Quality checking mainly means making sure of three points: the data density (to ensure suitable DTM output) and the horizontal and vertical accuracy of data.
How to use lascatalog processing engine for LIDR?
Section 14 showed how to use the LAScatalog processing engine to apply lidR functions on a collection of files. This included how to process acquisitions in user defined chunk sizes, loading buffers on-the-fly, saving the output to disk, and parallelizing tasks.
How does point cloud indexation work in LIDR?
Point cloud indexation is a topic covered by this vignette. In short, LAS file indexation allows for faster queries when extracting ROIs in files. Under the hood lidR relies on LASlib to read files and inherits of the capability to leverage the use of LAX files developed by Martin Isenburg.