The Landscape Package

One JSON file carries a woodlot's corridor layers between the mapping workspace, VergeCommon and your own tools. Lengths are meters and areas are square meters. Coordinates are WGS84 longitude and latitude.

Layers

Layer	Geometry	Properties that matter
`coreAreas`	Polygon	`dfm_id`; `core_class`: old-growth-candidate, old-growth-verified (needs `evidence_id`), riparian-core or reserve
`retained`	Polygon	Retained forest: riparian buffers, corridors, retained stands
`roads`	Line or polygon	`width_m` for a centerline, or the package's `roadWidthM`
`water`	Polygon	Open water; buffer stream centerlines into polygons first
`crossings`	Point	`passage`: verified, assumed or none
`treatments`	Polygon	`dfm_id`, `period`, `intensity`; inside a corridor only with `corridor_permitted`, a light intensity and a `reason`
`boundary`	Polygon	Outline of the planning area; carried for reference, not used by the check
`parcels`	Polygon	`consent`: covered or none; corridor on covered parcels counts as committed

A minimal package

{
  "dfm_package": "1.0",
  "crs": "EPSG:4326",
  "units": { "length": "m", "area": "m2" },
  "params": {
    "minWidthM": 100,
    "minWidthSource": "Co-op woodland policy, section 4",
    "roadWidthM": 6
  },
  "sources": { "roads": { "title": "County road centerlines", "date": "2026-05-01" } },
  "layers": { "coreAreas": [], "retained": [], "roads": [], "water": [],
              "crossings": [], "treatments": [], "parcels": [], "boundary": [] }
}

Run the check with the open-source dfm-core package. It is not on npm yet; install it from the repository until it is published.

import { checkConnectivity, fromLandscapePackage } from '@viridis/dfm-core';
const result = await checkConnectivity(fromLandscapePackage(pkg));
// result.status is 'pass', 'fail' or 'incomplete', with reasons

JSON Schemas for the package and the result