Strata proportion from DHM#

Algorithm ID: hedgetools:strataproportion

This tool takes a polygon vector layer representing hedges and a Digital Height Model (DHM) to compute the proportion of vegetation strata within the hedges. The strata bounds are user-defined.

Optionally, it can output a polygon vector layer where geometries correspond to each stratum.

Warning

Outputting the strata as a polygon vector layer doubles the processing time.

Parameters#

Label	Name	Type	Description
Input polygon layer	`INPUT`	[vector: polygon]	Polygon vector layer representing the hedges.
Input height raster (DHM)	`RASTER`	[raster]	Digital Height Model representing the height of objects above ground.
Height band	`BAND`	[raster band] Default: 1	Height band of the DHM raster in case of multiband.
Boundary for each height category	`BINS`	[string] Default: 0.3, 2, 7	Bounds for each strata. The first and last bounds are automatically appended with 0 and maximum height. For example, with the default values, the resulting strata bounds will be: [0:0.3[, [0.3:2[, [2:7[, [7:+[.
Output category as feature	`SPATIAL`	[boolean] Default: False	If enabled, a spatial output will be created.
Output strata layer	`OUTPUT`	[vector: polygon] Default: `[Create temporary layer]`	Output polygon vector layer.
Output category as feature (polygon)	`OUTPUT_SPATIAL`	[vector: polygon] Optional Default: `[Create temporary layer]`	Output polygon vector layer.

Outputs#

Label	Name	Type	Description
Output strata layer	`OUTPUT`	[vector: polygon]	Polygon vector layer with new fields summarizing strata metrics per hedge: `nb_strata`: Number of strata within the hedge. `dom_strata`: Strata covering the largest area within the hedge. `[bound_min:bound_max[`: Occupation proportion of this strata within the hedge.
Output category as feature (polygon)	`OUTPUT_SPATIAL`	[vector: polygon]	MultiPolygon vector layer of strata. Each strata within a hedge becomes one multipolygon. The layer includes: `id_strata`: Index of the strata (e.g., 2 for the second strata). `pid`: Polygon ID of the corresponding hedge. `strata`: Height range of the strata. `overlap`: Proportion of the hedge area occupied by this strata.

Label

Name

Type

Description

Output strata layer

OUTPUT

[vector: polygon]

Polygon vector layer with new fields summarizing strata metrics per hedge:

nb_strata: Number of strata within the hedge.
dom_strata: Strata covering the largest area within the hedge.
[bound_min:bound_max[: Occupation proportion of this strata within the hedge.

Output category as feature (polygon)

OUTPUT_SPATIAL

[vector: polygon]

MultiPolygon vector layer of strata. Each strata within a hedge becomes one multipolygon. The layer includes:

id_strata: Index of the strata (e.g., 2 for the second strata).
pid: Polygon ID of the corresponding hedge.
strata: Height range of the strata.
overlap: Proportion of the hedge area occupied by this strata.