UEHIS Technical Methodology & Provenance

Urban Ecosystem Health Intelligence System · Pune Baseline 2024

Institutional AffiliationSEER Bharat Foundation, Pune

Spatial DatumEPSG:32643 · UTM 43N

Total Grid Cells5,309 Blocks

Cell Dimensions250m × 250m

Scorable Partition5,298 Active

Excluded Boundary11 Excluded

The municipal computational fabric relies on an orthogonal regular grid projected in EPSG:32643 (UTM Zone 43N). This projection minimizes planar area and distance distortion across Pune's heterogeneous terrain and ridgelines.

Exclusion Criteria: 11 perimeter cells lack sufficient terrestrial surface area (<10% land surface) along jurisdictional water reservoirs and river margins; these cells are excluded from index calculations and are strictly not treated as zero values.

Study-Area Aggregation Formula

UEHI_area = ∑(UEHI_i × intersection_area_i) / ∑(intersection_area_i)

When assessing custom study areas, wards, or environmental impact polygons, the composite score is resolved through exact planar topological clipping. The 6 core factors include:

tree_density (Positive)Weight: Dynamic Entropy

Derived from Sentinel-2 canopy segmentations.

ndvi (Positive)Weight: Dynamic Entropy

Multispectral vegetation vigour index.

impervious_surfaces (Negative)Penalty

Built-up fraction reducing natural hydrologic infiltration.

temperature (Negative)Penalty

Land Surface Temperature thermal heat island impact.

pm25 (Negative)Penalty

Ambient fine particulate matter concentration baseline.

population_exposure (Negative Penalty Multiplier)m(i) = 1 - β · N(Pop_i)

Demographic density from WorldPop. With β = 0.3, higher population exposure acts as a strict penalty reducing the final health score.

To prevent dimensional collapse in low-variance variables, a coefficient-of-variation variance floor is strictly enforced prior to Shannon entropy weighting.

verified_userMethodology Integrity Certification

This computational reference establishes the standard environmental auditing framework for Pune Municipal Corporation ward demarcations. Published by SEER Bharat Foundation under spatial research protocol v2024.3.

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