Compute lidar metrics (raster)#

Algorithm ID: hedgetools:lidarrastermetrics

Compute a set of choosen lidar derivated metrics on pixels that overlap polygon of the given polygon layer from COPC point cloud files. COPC files are point clouds files optimized for spatial request and can be created from common LAS/LAZ files using QGIS pdal:createcopc algorithm. The full list of available metrics is given here.

Warning

Some metrics compute a high number of outputs (for example metrics per strata). This can cause some slowdown when writing raster. If you want to compute a lot of metrics we advise to run multiple time the algorithm to reduce the slowdown. If you do so consider to preprocess lidar files once to avoid doing it on stream for each run.

Parameters#

Label	Name	Type	Description
COPC lidar files	`LIDAR_FOLDER`	[folder]	Folder with COPC lidar files.
Polygon layer	`HEDGES`	[vector: polygon]	Layer with target features where to compute metrics.
Metrics	`METRICS`	[string]	JSON string containing metrics with parameters. Choice of metrics is made using `Metrics` panel.
Lidar preprocessing operations Optional	`OPERATIONS`	[string] Default: None	JSON string containing preprocessing operations with parameters. Choice of operations is made using `Lidar preprocessing operations` panel.
Strata bounds	`BINS`	[string]	Strata bounds. Bounds should be separated with `,` and decimals mark after `.`.
Voxel X size	`VOXEL_X`	[numeric: double] Default: 10	Size of voxels on X axis.
Voxel Y size	`VOXEL_Y`	[numeric: double] Default: 10	Size of voxels on Y axis.
Voxel Z size	`VOXEL_Z`	[numeric: double] Default: 0.5	Size of voxels on Z axis.
Parrallel threads	`WORKERS`	[numeric: integer]	Number of parrallel threads.
Raster resolution	`RASTER_RESOLUTION`	[numeric: double] Default: 1.0	Pixels resolution (m).
Polygon layer	`OUTPUT`	[raster] Default: `[Create temporary layer]`	Output raster.

Outputs#

Label	Name	Type	Description
Output raster	`OUTPUT`	[raster]	Raster with N bands. N is the total number of computed metrics outputs.