🗺️ 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).
Training the teams who use these tools.
A one-day course gives the ecological reference points these tools assume: recognising what is being recorded, understanding what a protocol requires, and knowing what makes a survey usable.
7 hours · No prerequisite
Operated by IRICE with QUALITEL Formation, a Qualiopi-certified body. Training is not covered by the accreditation held for certification activities.