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Generate tree cover

Algorithm ID: hedgetools:generatetreecoverlidar

This tool generates a tree cover raster and vector layer using a classified point cloud layer. The vector layer is generated from the sieved raster if a sieve operation is performed.

Parameters

Label	Name	Type	Description
Input point cloud layer	LAS	[point cloud]	Classified point cloud layer
Vegetation category to use	CATEGORY	[enumeration] Default: [1,2]	Vegetation category to use: 0: Low vegetation [0-0.5m] – may create noise. 1: Medium vegetation [0.5-1.5m]. 3: High vegetation [1.5m - +]
Extent of the study area Optional	EXTENT	[extent]	Input extent from a layer, canvas, or other source to clip the rasters.
Compute sieved tree cover mask	SIEVE	[boolean] Default: True	If enabled, the tree cover mask is sieved to remove small holes. Recommended to reduce noise in vegetation layers.
Threshold sieve value (pixel number)	THRESHOLD_SIEVE	[numeric: integer] Default: 100	Minimum number of pixels for a feature to be kept in the sieved mask.
Output resolution (meters) Optional	RESOLUTION	[numeric: double] Default: 1.0	Change the output raster resolution to the desired value.
Output tree cover raster	OUTPUT_TREE_COVER	[raster] Default: [Create temporary layer]	Output raster.
Output sieve tree cover raster	OUTPUT_SIEVE	[raster] Default: [Create temporary layer]	Output raster.
Output vector tree cover	OUTPUT_VECTOR	[vector: polygon] Default: [Create temporary layer]	Polygon vector layer.

Outputs

Label	Name	Type	Description
Output tree cover raster	OUTPUT_TREE_COVER	[raster]	Tree cover raster representing the selected vegetation categeories.
Output sieve tree cover raster	OUTPUT_SIEVE	[raster]	Tree cover raster with small holes removed based on the sieve threshold.
Output vector tree cover	OUTPUT_VECTOR	[vector: polygon]	Vectorized tree cover used in subsequent algorithms.