[Assessment on heat island effect based on urban regulatory planning.]

With the improved legal status of urban planning, regulatory detailed planning is playing an increasingly important role in guiding land leasing and regulating the spatial structure of urban construction. Understanding the effect of regulatory planning indices on urban heat island (UHI) and evaluating the heat environment performance of indices combination at the scale of regulatory planning unit and plot are of great significance for assessing the thermal environment effect of regulatory planning quantitatively and putting forward action plans to mitigate heat island impacts. In this study, we assessed impacts of main urban regulation indices and their combinations on UHI by analyzing land surface temperature (LST) data, retrieved through the thermal infrared remote sensing image (Landsat8 TIRS), using statistical and GIS spatial analysis methods. Results indicated that the indices of green ratio, plot area, building density and building height all had a significant impact on LST at regulatory planning unit level. By generating 3D models, we found the regulation index combination with round 30% of green ratio, and 2.5-3.5 of floor area ratio had the minimal impact on urban thermal environment at regulatory plot. The outcomes provided a new perspective on the rational improvement of urban regulatory planning.