The workflow

Corridors (Fc)

Reward routing alongside existing corridors, with onshore/offshore handling.

The Corridors tab of the plugin

The Corridors tab produces the existing-corridor factor Fc — cheaper near an existing corridor, more expensive on a brand-new path (and offshore).

Inputs

Select Corridor Vector (existing pipelines / oil corridors) and Select Reference Raster.
Corridor Buffer Distance (meters) — the proximity-incentive zone around existing corridors (default 25).
Four cost inputs: corridor present / absent × offshore / onshore.
Select Land Use Layer for water-body detection — tick the water classes in the table (Class ID, Class Name, Water Body) so the tool can tell onshore from offshore.

Click Create Corridors Costs Raster → the Fc raster.

The COMET corridor values are in Cost-factor tables.

Next: Aux.