🗺️ Public methodology
TerraLink — Ecological stakes of the surroundings
The BIOM365 tools' methodology is published and grounded, indicator by indicator, in the field's reference work: each tool sets out what it measures, how it computes it, its sources and its limits.
Use the tool →What it measures
The ecological stakes of an address's surroundings (exposure / context), from public geographic data. Strictly speaking, « sensitivity » (an habitat's resistance + resilience) is distinct from exposure (PatriNat): it is only computed in the PRO mode's habitats module.
How it computes
A composite score of four renormalised indices: regulatory zoning (real distance to perimeters), vegetation cover (land use over a real radius), ecological continuity (Green & Blue Network reservoirs / corridors), wet sensitivity (RAMSAR → confirmed wetland → potential gradient). Weightings shown, reliability index based on the effective availability of layers.
Open data without an API key (BAN, IGN Carto API, land use, regional Green & Blue Network); an orientation score with reliability and layer vintages shown.
Finer sources (OCS GE, INPN / species occurrences, habitats), real distances, fragmentation proxies, moisture gradient, « sensitivity » module on habitats of community interest. Feeds the initial state, the ERC sequence and ecological continuities (initial state / ERC).
Common methodological foundation
- Verifiability — a data point carrying a score must be provable — mandatory in PRO.
- Conservativeness — without evidence, we do not overestimate; declarative input is flagged.
- Consistency — any time-series data is comparable — bounded observation effort.
Two quality indices accompany each score: a reliability index (input completeness; below a threshold the score reads « not computable ») and a confidence index (traces the source of each value; by convention, the lowest of its components' indices).
On screen: a 0-100 score + a one-word label + a colour. Performance axis (Excellent / Good / Fair / Low / Critical), thresholds aligned with the internal grade so a displayed score and its history never contradict each other. Exposure axis for BiodivPass and TerraLink (Contained exposure → Immediate action).
Thresholds and weightings rely on the guide-values and reference frameworks cited, and are consolidated continuously with the scientific committee (Biodiversity Standard Council).
Stated limit
An orientation tool, not an inventory: this prioritisation work must be completed with field surveys and analyses backed by ecological expertise; it does not replace regulatory studies.
Sources & references
- CDC Biodiversité — Local Biodiversity Index
- OID / BIG — Biodiversity welcome potential / BIODI-Bat
- PatriNat — ecological sensitivity (INPN)
- API Carto IGN
- OCS GE (IGN)
- Green & Blue Network / SRADDET
- ACT Biodiversity — methodology (ADEME/OFB)
- Avoid-Reduce-Offset sequence (OFB)
The measurement protocols rely on the recognised methods above. Thresholds and weightings are consolidated continuously with the scientific committee (Biodiversity Standard Council).