Methodology

CCFPI was developed through original Irish forestry and GIS research using spatial multi-criteria and fuzzy suitability analysis. Its purpose is to assess, consistently and transparently, where Irish Sitka spruce plantations have the site conditions to support a transition from even-aged plantation management to Continuous Cover Forestry.

The index does not attempt to answer whether transition is desirable for a given owner. It answers a narrower and more testable question: whether terrain, soil and exposure conditions at a location are likely to support the structural opening that continuous cover management requires.

Six site factors are used in this software build, each standardised to a 0–100 suitability score before weighting.

These six factors and weights are the simplified operational/demonstration CCFPI configuration used by this software build. They are not the original MSc research weights. The original research model is a seven-factor Fuzzy Weighted Overlay, shown in full on the CCFPI research page.

The original MSc research model is the seven-factor Fuzzy Weighted Overlay shown on this page. The CCFPI configuration used in the application's lifecycle demonstration is a simplified operational/demo implementation with a different factor set and different weights. Those demonstration weights are not the original MSc research weights.

1. Input layers
2. Standardisation
3. Fuzzy factor suitability
4. Weighting
5. Constraints
6. CCFPI score
7. Interpretation

Input raster and vector layers are clipped to the forest parcel and resampled to a common analysis grid. Each layer is standardised into a suitability surface using fuzzy membership functions, so that partial suitability is preserved rather than forced into hard categories. Standardised surfaces are combined using a weighted linear sum, and constraint layers are applied afterwards so that a site cannot be scored as suitable where a limiting condition is present.

• CCFPI score. A 0–100 index expressing the modelled potential of a Sitka spruce stand to transition to Continuous Cover Forestry.
• Transition-potential class. Very low (0–20), Low (21–40), Moderate (41–60), High (61–80), Very high (81–100).
• Factor scores. A standardised 0–100 suitability score for each site factor of the configuration in use.
• Factor contribution. Factor score multiplied by factor weight, showing how each variable moved the index.
• Lowest-scoring factor. The factor with the lowest standardised score, reported explicitly. It is not treated as a principal constraint.
• Principal constraint. Reported only when a factor crosses an explicitly configured constraint threshold. In the prototype, No research-verified constraint rule has been applied.
• Confidence score. A weighted average of the confidence attached to each input layer, reflecting resolution and provenance.

The MSc research included an initial validation exercise: model output was compared against known Continuous Cover Forestry sites in County Wicklow, including Sitka spruce plots, alongside a sensitivity analysis across factor weights. Those figures are reported and interpreted on the CCFPI research page.

The current software implementation has not been independently validated or reproduced against the original research outputs. All values shown in the application are demonstration data and the original GIS outputs are not yet connected. This statement concerns the software build, not the MSc research.

• Applies to Sitka spruce plantations in Ireland only; no other species or geographies are modelled.
• Soil variables are derived from coarse national mapping and cannot resolve within-stand variation.
• Wind exposure is modelled from terrain and does not account for local shelter, edge history or recent windthrow.
• Stand-level management history, access and ownership objectives are outside the index.
• The index is a screening tool. It cannot substitute for field assessment by a qualified forestry professional.

CCFPI originates from completed MSc Forestry research by Jay Gilbert — MSc Forestry researcher · Independent Researcher and Founder, BRANCHX LIMITED.

Gilbert, J. Assessing Ireland's suitability for continuous cover forestry: Development of the Continuous Cover Forestry Potential Index (CCFPI) for national application and Sitka spruce transformation. Completed MSc Forestry research.