Sahnoune, SBenhassine, NBourbia, FHadbaoui, H2023-05-282023-05-282021-01-01S . Sahnoune, N . Benhassine , F. Bourbia , H. Hadbaoui, QUANTIFYING THE EFFECT OF GREEN ROOF AND URBAN GREEN INFRASTRUCTURE RATIO ON URBAN HEAT ISLAND MITIGATION - SEMI ARID CLIMATE.Journal of Fundamental and Applied Sciences.VOL13 N01.01/01/2021.university of el oued [visited in ../../….]. available from [copy the link here]1112-9867http://dspace.univ-eloued.dz/handle/123456789/24548ArticleGreen Roof (GR) is one of the most applied strategies to Mitigate Urban Heat Island (UHI) recommended for sustainable cities. This research aims to examine and evaluate the eff ect of the GR/U GI ratio on UHI mitigation, creating Urban Cool Island (UCI). The study was carried out at Constantine, situated in the East part of Algeria, characterized by a semi arid climate with high summer solar radiation intensity. An urban climate a nalysis was con ducted during the hottest period of the year by means of remote sensing data using ArcGIS 10.2 platform. The results displayed that vegetation, urban density, and topography strongly affect UHI. Furthermore, other finding results in this res earch show that fixing GR/UGI ratio (with 0.0063 reduced the average air temperature by 1.24°C) in a large scale urban area, can reduce the surface temperature by 4.00 degrees of the studied area.enKeywords: Urban Heat Isl and (UHI); Green Roof Ratio Urban G reen Infrastruc ture (GR/UGI); Urban Cool Island (UCI)Article