Grid#

Algorithm ID: hedgetools:grid

This tool takes a polygonal grid layer and summarize the hedges in each cell of the grid with various indicator.

The grid layer can be created using QGIS native:creategrid algorithm.

Parameters#

Label

Name

Type

Description

Input grid layer

INPUT_GRID

[vector: polygon]

Polygon vector layer representing the analysis grid.

Available metrics

METRICS

[enumeration]

Metrics to compute. Available metrics are:

  • 0: Sum of O nodes – Count of degree 1 nodes.
  • 1: Sum of L nodes – Count of degree 2 nodes.
  • 2: Sum of T nodes – Count of degree 3 nodes.
  • 3: Sum of X nodes – Count of degree 4 nodes.
  • 4: Sum of M nodes – Count of degree 5+ nodes.
  • 5: Icon – Connectivity index – weighted sum of hedge intersections.
  • 6: Icoh (%) – Consistency index – percentage of hedge extremities connected to other hedges and forest/groves.
  • 7: Density (ml/ha) – Total hedge length per hectare.
  • 8: Density (%) – Percentage of hedge coverage within each grid cell.
  • 9: Icod – Bocage density and structure index.
  • 10: Total length – Sum of arc lengths within each grid cell.

Arc layer

INPUT_ARC

[vector: line]
Optional

Line vector layer of the median axis. Required for Density (ml/ha) and Total length metrics.

Node layer

INPUT_NODE

[vector: point]
Optional

Point vector layer of hedge extremities. Required for Sum of*, Icoh, and Icod metrics.

Polygon layer

INPUT_POLYGON

[vector: polygon]
Optional

Polygon vector layer of hedges. Required for Density (%) and Icod metrics.

Node type field

NODE_TYPE

[field: string]
Optional

Field in the node layer describing node type. Required for Sum of metrics.

Distance to forest field

FOREST_FIELD

[field: string]
Optional

Field in the node layer describing the distance to the closest forest. Required for Icoh and Icod metrics.

Output grid layer

OUTPUT

[vector: polygon]
Default: [Create temporary layer]

Output polygon vector layer

Outputs#

Label

Name

Type

Description

Output grid layer

OUTPUT

[vector: polygon]

Grid polygon layer with computed metrics added as new fields.