What GIS for environmental analysis actually involves

Geographic Information Systems (GIS) are software platforms that capture, store, analyse, and visualise spatial data. In an environmental context, GIS is used to map biodiversity sensitivity against operational footprints, assess flood and climate risk at asset level, identify protected areas and habitats affected by proposed developments, and support environmental impact assessment and nature risk disclosure under TNFD. For corporate sustainability teams, GIS is increasingly a practical tool for translating location-based risk data into decision-relevant outputs rather than a specialist cartography exercise.

Why it's harder in practice than it looks

Data quality and compatibility vary significantly between sources

Environmental spatial datasets, habitat maps, flood zones, species distribution models, soil classifications, come from multiple public and commercial sources in different projections, scales, and formats. Combining them meaningfully requires GIS expertise; using them naively produces misleading outputs.

Interpreting spatial analysis requires domain knowledge, not just software skills

A GIS analyst who does not understand ecology will produce biodiversity sensitivity maps that look authoritative but misrepresent risk. Environmental GIS analysis requires collaboration between spatial analysts and subject-matter experts in the specific environmental discipline being assessed.

Corporate asset location data is often incomplete or inaccurate

Physical risk and nature risk assessments require precise coordinates for all owned and leased properties, operational sites, and key supply chain locations. Many large organisations hold this data in inconsistent formats across multiple property management systems, with coordinates that are approximate rather than precise.

Outputs must be interpretable by non-GIS audiences

Maps and spatial analysis produced for board-level or investor audiences need to convey complex risk information clearly without requiring GIS literacy. Poor visualisation choices, inappropriate colour scales, lack of context layers, missing legends, undermine the credibility of technically sound analysis.

What good looks like

Well-executed environmental GIS analysis starts with a clearly defined question, uses verified and appropriately scaled spatial datasets, applies an explicit and documented methodology, and produces outputs calibrated to the intended audience. For TNFD LEAP assessments, GIS is used to identify locations of high biodiversity sensitivity and water stress relative to operational and supply chain footprints. For EIA, GIS produces receptor maps and assessment zones that are consistent with the planning authority's expectations.

When to bring in external support

Environmental GIS analysis sits at the intersection of spatial analysis skills and environmental science knowledge. Leafr's network includes environmental GIS specialists and TNFD-experienced practitioners who deliver location-based risk assessments, biodiversity sensitivity screening, and spatial disclosure outputs for corporate sustainability programmes.

Frequently asked questions

What is GIS and how is it used in sustainability?

GIS (Geographic Information Systems) is software that enables spatial data to be captured, managed, analysed and visualised. In sustainability, it is used to map climate and nature-related risks at asset level, support environmental impact assessments, analyse supply chain geographic exposure to deforestation or water stress, and produce location-based disclosures under frameworks such as TNFD. Platforms include ArcGIS, QGIS, and Google Earth Engine.

How is GIS used in biodiversity and nature risk assessment?

GIS enables overlaying of company asset and supply chain locations against datasets showing biodiversity sensitivity, protected area boundaries, Key Biodiversity Areas, habitat maps, species distribution models, and freshwater stress indices. The TNFD LEAP approach uses GIS-based screening to identify which locations warrant deeper ecological assessment, making it the starting point for any credible corporate nature risk analysis.

What spatial datasets are used for physical climate risk assessment?

Physical climate risk GIS analysis uses datasets including flood zone maps, sea level rise projections, extreme heat exposure indices, wildfire risk maps, and water stress projections from sources such as the Environment Agency, Fathom, JBA Risk Management, and the World Resources Institute's Aqueduct tool. These are overlaid against company asset locations to identify sites with material exposure to specific climate hazards.

Do companies need GIS software in-house to use spatial analysis?

Not necessarily. Many environmental risk screening tools, IBAT for biodiversity, Aqueduct for water, ClimateArc for physical climate risk, provide web-based interfaces that allow companies to run standardised spatial analyses without specialist GIS software. For more complex or bespoke analysis, GIS specialists using ArcGIS or QGIS provide greater flexibility. The right approach depends on the depth and specificity of analysis required.

How is GIS output used in TNFD disclosures?

TNFD's LEAP approach (Locate, Evaluate, Assess, Prepare) begins with a GIS-based location step that identifies which of a company's direct operations and supply chain nodes are in or near areas sensitive to nature loss. This spatial screening determines which sites require deeper dependency and impact assessment. GIS outputs form part of the evidence base for TNFD disclosures about the geographic exposure of the company's nature-related risks.