A novel approach for quantifying high-frequency urban land cover changes at the block level with scarce clear-sky Landsat observations

2021 ◽  
Vol 255 ◽  
pp. 112293
Author(s):  
Chuanbao Jing ◽  
Weiqi Zhou ◽  
Yuguo Qian ◽  
Wenjuan Yu ◽  
Zhong Zheng
Keyword(s):  
Land Cover ◽  
High Frequency ◽  
Urban Land ◽  
Land Cover Changes ◽  
Clear Sky ◽  
Urban Land Cover ◽  
Novel Approach ◽  
Block Level

Simulating urban land cover changes at sub-pixel level in a coastal city

2014 ◽  
Author(s):  
Xiaofeng Zhao ◽  
Lei Deng ◽  
Huihui Feng ◽  
Yanchuang Zhao
Keyword(s):  
Land Cover ◽  
Urban Land ◽  
Land Cover Changes ◽  
Coastal City ◽  
Urban Land Cover

Quantification of Urban Heat Intensity with Land Use/Land Cover Changes Using Landsat Satellite Data Over Urban Landscapes

2021 ◽  
Author(s):  
Ruchi Bala ◽  
Rajendra Prasad ◽  
Vijay Pratap Yadav
Keyword(s):  
Land Cover ◽  
Land Surface ◽  
Urban Land ◽  
Land Cover Changes ◽  
Urban Landscapes ◽  
Positive Contribution ◽  
Negative Contribution ◽  
Urban Land Cover ◽  
Urban Heat ◽  
Landsat Satellite

Abstract Urban heat island (UHI) is a phenomenon which may have adverse effects on our environment and is stimulated as a result of urbanisation or land cover changes. Thermal remote sensing has been found beneficial to study the effect of urbanisation on UHI intensity. This paper analyses the variation in Land surface temperature (LST) with land cover changes in Varanasi city of India from 1989 to 2018 using Landsat satellite images. A new index named Urban Heat Intensity Ratio Index (UHIRI) was proposed to quantify the urban heat intensity from 1989 to 2018 which was found to increase from 0.36 in year 1989 to 0.87 in year 2018. Further, contribution of each land cover towards UHI was determined using Land cover contribution index (LCCI). The negative value of LCCI for water and vegetation indicates its negative contribution towards UHI whereas positive value of LCCI for bare soil and built-ups depicted its positive contribution towards UHI. The LCCI value for urban land cover shows significant increase in 29 years i.e. 0.49, 1.43, 3.40, 4.37 for years 1989, 1997, 2008 and 2018 respectively. The change in normalized LST from years 1989 to 2018 for the conversion of bare land to built-ups and vegetation to built-ups were found to be as -0.11 and 0.42 respectively. This led to conclusion that the replacement of vegetation with urban land cover has severe impact on increasing UHI intensity.

scholarly journals Influence of urban land cover changes and climate change for the exposure of European cities to flooding during high-intensity precipitation

2015 ◽  
Vol 370 ◽  
pp. 21-27 ◽  
Author(s):  
P. Skougaard Kaspersen ◽  
N. Høegh Ravn ◽  
K. Arnbjerg-Nielsen ◽  
H. Madsen ◽  
M. Drews
Keyword(s):  
Climate Change ◽  
Land Cover ◽  
High Intensity ◽  
Overland Flow ◽  
Urban Land ◽  
Land Cover Changes ◽  
Climate Change Scenarios ◽  
European Cities ◽  
Urban Land Cover ◽  
Pluvial Flooding

Abstract. The extent and location of impervious surfaces within urban areas due to past and present city development strongly affects the amount and velocity of run-off during high-intensity rainfall and consequently influences the exposure of cities towards flooding. The frequency and intensity of extreme rainfall are expected to increase in many places due to climate change and thus further exacerbate the risk of pluvial flooding. This paper presents a combined hydrological-hydrodynamic modelling and remote sensing approach suitable for examining the susceptibility of European cities to pluvial flooding owing to recent changes in urban land cover, under present and future climatic conditions. Estimated changes in impervious urban surfaces based on Landsat satellite imagery covering the period 1984–2014 are combined with regionally downscaled estimates of current and expected future rainfall extremes to enable 2-D overland flow simulations and flood hazard assessments. The methodology is evaluated for the Danish city of Odense. Results suggest that the past 30 years of urban development alone has increased the city's exposure to pluvial flooding by 6% for 10-year rainfall up to 26% for 100-year rainfall. Corresponding estimates for RCP4.5 and RCP8.5 climate change scenarios (2071–2100) are in the order of 40 and 100%, indicating that land cover changes within cities can play a central role for the cities' exposure to flooding and conversely also for their adaptation to a changed climate.

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