urban-heat-island-utac

GenesisAeon Package 132 - real surface urban heat island (MODIS LST), park cooling, impervious-surface vs LST relationship structure, and city-scale green-roof ambient air-temperature mitigation. Deliberately has no UTAC/CREP/AFET bridge - see DISCLAIMER.md.

For a plain-language explanation of the same topic (German, no jargon, written for general audiences), see WHITEPAPER.md.

Separate from P108

This is not an extension of urban-green-infrastructure-utac (P108). P108 is hydrology only (sealing vs recharge; green-roof rainfall retention). P132 is temperature (evaporative cooling / albedo / radiation balance) - same precedence as the P107/P108 split itself.

What's real here

• Peng et al. (2012, Environmental Science & Technology) - annual-mean surface UHI across 419 cities (MODIS LST): day 1.5 ± 1.2 °C, night 1.1 ± 0.5 °C. Day and night are uncorrelated. This is surface temperature, not air temperature.
• Bowler et al. (2010, Landscape and Urban Planning) - systematic review: parks are on average 0.94 °C cooler (daytime) than surrounding built area.
• Yang, Huang, Yang, Liu (2021, Environmental Research Letters) - LST vs artificial impervious surface fraction across 682 cities. Cited as core structure; the regression coefficient is intentionally unset until pinned from the primary text (the build prompt does not list the slope number - inventing it is forbidden).
• Santamouris (2014, Solar Energy) - green roofs at city scale: 0.3-3.0 K reduction of mean ambient air temperature (not LST, not indoor).

Explicitly not used

• De Cristo et al. (2025) - documented-tier note only; no numeric constants from it.
• Unverified Phoenix ~1.5 °C / New York ~2.5 °C green-roof case studies (no DOI in source prompt) - excluded.

Quickstart

pip install urban-heat-island-utac

from urban_heat_island_utac import (
    uhi_surface_day_c_mean,
    uhi_surface_night_c_mean,
    park_daytime_cooling_c_mean,
    green_roof_cityscale_air_temp_reduction_k_range,
    yang_2021_lst_vs_impervious_slope,
    is_uhi_a_single_universal_value,
    is_surface_temperature_the_same_as_air_temperature,
)

print(uhi_surface_day_c_mean())          # 1.5  (SURFACE / LST)
print(uhi_surface_night_c_mean())        # 1.1  (SURFACE / LST)
print(park_daytime_cooling_c_mean())     # 0.94
print(green_roof_cityscale_air_temp_reduction_k_range())  # (0.3, 3.0) AIR
print(yang_2021_lst_vs_impervious_slope())  # None until pinned
print(is_uhi_a_single_universal_value())  # False
print(is_surface_temperature_the_same_as_air_temperature())  # False

Development

pip install -e ".[dev]"
ruff check src tests
mypy src
pytest

Citation

See CITATION.cff and .zenodo.json.