Incessant conurbation in Noida has exacerbated its microclimate, causing rise in the thermal anomalies within the city. Between 2011 and 2019, there is an immoderate increase in the hotspots and overall decrease in the thermal comfort of the city, evaluated using the Urban Thermal Field Variance Index (UTFVI). The study further explores the association between land surface temperature (LST) and spectral indices - Normalized Difference Vegetation Index (NDVI) and Index-based built-up Index (IBI) for both the years. The results highlight that there is an increase of 6.42 °C in eight years. The NDVI values have increased from 0.06 to 0.14 during these years, suggesting increase in the total urban greenness in the city. The observed increase in IBI values explains the rising LST of the city. LST exhibits negative correlation with NDVI ascertaining the cooling impact of green spaces and positive correlation with IBI highlighting the heating effect of built-up on urban microclimate. Measuring and monitoring the intensity of these UHI in space and time is important to analyse the thermal environment at the city scale. Identification of such anomalies in the urban thermal environment can provide the best input for equipping urban areas to be more resilient and sustainable.

诺伊达（Noida）不断的城市化加剧了其小气候，导致城市内部的热异常上升。根据城市热场方差指数（UTFVI）评估，2011年至2019年期间，热点地区适度增加，而城市的热舒适度总体下降。这项研究进一步探索了地表温度（LST）和光谱指数之间的关联-两年中的归一化植被指数（NDVI）和基于指数的建筑指数（IBI）。结果表明，八年以来平均气温上升了6.42°C。这些年来，NDVI值从0.06增至0.14，这表明该城市的总体城市绿色度有所提高。观察到的IBI值增加解释了该城市LST的上升。LST与NDVI呈负相关，确定绿色空间的降温影响，与IBI呈正相关，突出显示建筑物对城市小气候的热效应。测量和监视这些UHI的时空强度对于分析城市规模的热环境很重要。识别城市热环境中的此类异常现象可为使城市区域更具弹性和可持续性提供最佳输入。