Analysis of Two Decades Variations in Urban Heat Island Using Remotely Sensed Data in Nguru Local Government Area, Yobe State, Nigeria (original) (raw)
Related papers
Spatial and Temporal Changes of Urban Heat Island in Kano Metropolis, Nigeria
Major cities of the world are faced with the problem of overwhelming increase in temperature as compared with their surrounding countryside. Recent researches concluded that, the reason behind this phenomenon is the conversion of natural surfaces such as vegetation, with low thermal inertia to man-made structures like tarred roads and concrete structure with high thermal inertia. This concept is known as " Urban Heat Island " and remote sensing and GIS is found to be a significant technique to study this phenomenon. The present study investigates the spatial and temporal pattern and changes of urban heat island (UHI) in Kano metropolis, Kano state Nigeria. Land surface temperature (LST) values were extracted from Landsat TM image (1986), ETM+ (2000) and OLI (2014). Built-up area and road system were derived from 1:50,000 scale topographic maps. A Normalized Difference Vegetation Index (NDVI) map was extracted from the same image. Multiple correlation analyses were used to examine the relationship between UHI pattern and land use/land cover parameters (NDVI, built-up density and road density). Results show that, multiple heat islands emerged over central part of the city and along the major road that linked the city with other states. These areas coincide with the densely build-up area of the metropolis. Likewise, heat island emerges around the international airport of the state. The statistical analysis indicates that the UHI intensities had a negative relationship with NDVI, but a positive correlation with built-up. Interestingly, the temporal analysis indicate that, areas observe with lower land Surface Temperature In 1986 Have Been Recorded With Higher Temperature In 2000 And 2014.
ISPRS International Journal of Geo-Information
Rapid urbanization in cities and urban centers has recently contributed to notable land use/land cover (LULC) changes, affecting both the climate and environment. Therefore, this study seeks to analyze changes in LULC and its spatiotemporal influence on the surface urban heat islands (UHI) in Abuja metropolis, Nigeria. To achieve this, we employed Multi-temporal Landsat data to monitor the study area’s LULC pattern and land surface temperature (LST) over the last 29 years. The study then analyzed the relationship between LULC, LST, and other vital spectral indices comprising NDVI and NDBI using correlation analysis. The results revealed a significant urban expansion with the transformation of 358.3 sq. km of natural surface into built-up areas. It further showed a considerable increase in the mean LST of Abuja metropolis from 30.65 °C in 1990 to 32.69 °C in 2019, with a notable increase of 2.53 °C between 2009 and 2019. The results also indicated an inverse relationship between LST ...
ASSESSMENT OF URBAN HEAT ISLAND USING REMOTE SENSING AND GIS TECHNIQUES IN JOS METROPOLIS, NIGERIA
FUDMA International Journal of Social Sciences , 2020
The objectives of the study are to examine the different land cover in the urban area of Jos for three decades, assess the UHI and find out the temperature variations associated with different land cover types. Composed images were ordered into four area classes: water, built-up, bare-surface and vegetation. NDVI, Land Use Land Cover and Land Surface Temperature were used for this study. ArcGIS 10.3.1 and Google Earth are the software used for analysis. Findings in 1985 indicated that, the dominant land use is bare-surface, vegetation occupies the largest area in 2000, in 2017, built-up area occupies the largest proportion of the land area. Most extensive UHI occurred in the Central part of the CBD which is Terminus in 1985, in 2000, spot of UHI was observed in Bukuru area South of the metropolis. In the year 2017, there was an enormous widespread urban heat island from the city centre of Jos to the North and NorthEast of the metropolis. Variation of temperature between different land cover for the year 2000 indicated that built-up area has the highest average temperature of 27.68 0 C and the highest temperature was observed in the built-up areas with an average of 29.52 0 C in 2017. These results have shown that satellite thermal data can indeed be used to characterize both the magnitude and spatial extent of an urban heat island and land use/land cover. It is recommended that measures of curbing UHI in the metropolis should be taken seriously to reduce sensitivity to heat exposure.
Geospatial Assessment of Urban Heat Island in Port Harcourt L.G.A, Rivers State, Nigeria
2021
Urban development comes with its inherent challenges such as ecosystem alteration. Remote Sensing and GIS was used to assess the spatiotemporal variation of the surface urban heat intensity in Port Harcourt, Rivers State, from 1986 to 2018. The study period was chosen with specific objectives to examine land use land cover changes and assess the spatial and temporal extent of the land surface temperature(LST), determine a relationship between LULC and LST and examine the urban heat island (UHI) intensity using the Getis-Ord Hotspot Analysis. Landsat TM, ETM+ and OLI images of the study area (1986, 2003 and 2018) were implemented to carry out the study. The results of the land use and land cover analysis revealed that urbanised areas increased and covered 51% of the study area from 1986 to 2018. Vegetative cover reduced drastically between this time period, from 57% in 1986 to 30% in 2018, as forested regions made way for urban development to occur. Bare surfaces reduced in spatial e...
Remote Sensing and GIS Based Assessment of Urban Heat Island Pattern in Kaduna
descriptionInternational Journal For Research In Applied And Natural S c i e n c e, 2017
This study examines the pattern and distribution of heat island in Kaduna metropolis based on Landsat Imageries of 1995, 2005 and 2015, whose spatial resolution is sufficient for measurement of some important environmental parameters.The study first identified patterns of land cover changes between the periods and investigated their d from the corrected image and a relationship with Land surface temperature (LST) was established based on Environmental Criticality Index (ECI). Land surface temperature (LST) was retrieved using the mono-window algorithm with area of UHI identified in the study area. Results show that Kaduna city’s urban heat island effect is on the increase, substantial and in variance, which could be visually characterized by the spatial pattern of retrieved thermal properties. The study, therefore, concluded that different Land Use Land Cover (LULC) revealed varying temperature, and identified UHI was apparent and more conspicuous in the 2015 as compared to 1995 and 2005 within the metropolis. Particularly, due to the scarcity of vegetation, some hotspots are built-up areas, bare surfaces, central business districts (CBD) areas, and the surface temperature of which is even slightly higher than suburbs. This study suggested a strict adherence to Kaduna master plan, vegetation regeneration and establishment of green areas and parks (go-green initiatives), reflective roofing materials, and lightening of pavements as adaptive/mitigation measures against UHI in the study area.
Urbanisation Effect on the Occurrence of Urban Heat Island over Kano Metropolis, Nigeria
International Journal for Scientific and Engineering Research, 2017
The Urban Heat Island (UHI) effect is a phenomenon of higher atmospheric and surface temperatures occurring in urban areas than in surrounding rural areas happening majorly as a result of urbanisation and industrialisation. The effect of urbanisation on the occurrence of UHI in Kano metropolis was investigated. Landsat images of the study area for the years of 1986, 1998, 2006 and 2016 sourced from the archives of the United States Geological Survey (USGS) were utilised in this study. Land Surface Temperature (LST) and Land Use/Land Cover (LULC) maps for the years of 1986, 1996, 2006 and 2016 were estimated using Model Maker in Earth Resource Development Assessment System (ERDAS) Imaging 14 software. The urban city centre exhibit higher surface temperatures compared to its suburban counterparts thus, indicating the presence of the Surface UHI over Kano Metropolis. Urbanisation accounted for 80.5% increment in the LST of Kano Metropolis, thus indicating a very strong positive relationship between urbanisation and UHI. Conclusively, urbanisation is identified as the major factor that leads to the occurrence of surface UHI in Kano Metropolis. Recommendations include afforestation programmes, adoption of green and cool roofing technologies, proper spacing between houses, and accommodation of green areas and open spaces and continuous monitoring of weather events.
The fast urban expansion has led to the transformation of the natural landscape into anthropogenic surfaces. The city of Abeokuta, for instance, is located in a region experiencing rapid urbanization, which has produced a remarkable effect on the surface thermal response. This effect significantly influences urban internal microclimatology on a regional scale. In this study, the surface temperatures and land cover types retrieved from Landsat TM and ETM+ images of Abeokuta city for 1984, 2003, and 2014 were analyzed. A quantitative approach was used to assess surface urban heat islands through the relationships among surface temperature and land cover types. Results showed that impervious surface areas were found to be correlated positively with high temperatures. Conversely, vegetated areas and bare surfaces correlated positively with mid temperature zones. This study found that areas with increasing impervious surfaces will accelerate LST rise and consequently lead to increasing effect of surface urban heat islands. These findings pose a major challenge to urban planners. However, the study would help to quantify the impacts of different scenarios (e.g., vegetation loss to accommodate urban growth) on LST and consequently to devise appropriate policy measures.
Assessment of Urban Heat Island in Kaduna Metropolis Between 2000 and 2018
FUDMA JOURNAL OF SCIENCES, 2021
Urbanization is a major event in human history and there is no doubt the world is urbanizing rapidly and this is resulting in changes in temperature. This research aims is to identify changes in land surface temperature (LST) between 2000 and 2018. The technique used is the Landsat TM. The result of the land cover classification revealed a +15.93% increase in built-up areas, -27.21% decrease in vegetative cover, +11.19% increase in bare land and +0.09 increase in water bodies between 2000 and 2018. NDVI analysis showed a +0.02 and +0.17 increase in the maximum and minimum range and a +2.16 and -7.76 increase and decrease in maximum and minimum temperature respectively for LST. The finding revealed that the repelling of vegetative cover by built-up is an evidence of rapid urbanization taking place in Kaduna metropolis and a major driver of UHI in Kaduna metropolis. Conclusively, there is a correlation between the various land covers of study i.e built-up, vegetative cover, bare l...
Urban Heat Island and Land Use/Cover Dynamics Evaluation in Enugu Urban, Nigeria
Journal of Geoscience and Environment Protection, 2022
This study specifically estimated the effect of land use/cover change (LULC) processes on land surface temperature (LST) in Enugu urban and its suburbs. With Landsat images and supervised classification technique, four LULC classes comprising built-up areas, vegetation, rock outcrop, bare ground/farmland areas were delineated. The LST was extracted from the thermal bands of the images. The rate of change in land cover classes between 2009 and 2018 showed that from 2009 to 2013, built-up areas increased from 31.65% to about 47.5%, while vegetation cover decreased from 18.43% to 11.23%. Also, the periods witnessed about 8.69 km 2 of vegetation being converted to other land surfaces. The trend in the LST in Enugu urban showed the highest mean temperatures of 34.5˚C in 2018 and 32.26˚C in 2015. However, in 2013 there was a slight decrease in mean LST to 31.65˚C which further decreased to 31.26˚C in 2009. This change in temperature suggests that urbanisation could have significant effect on the micro-climate of Enugu city. Result also revealed weak relationships between LULC classes and the LST throughout the years. The results of the surface heat intensity for the urban and rural areas showed general increase over the years and this suggests that rural areas are also experiencing high temperature which could be due to the loss of vegetation, increase in artificial surfaces and urban encroachment. Findings from this study could be useful for effective urban land-use planning, policy development and management in Nigeria, and elsewhere.
South African Journal of Geomatics, 2022
The threat of the increasing global temperature is now of global concern than ever before. This prompted the authors to gain insights on the Urban Heat Island (UHI) phenomenon in a mediumsized city of Akure, Nigeria. A random sampling of three hundred and twenty-five (325) structured questionnaires was administered and analyzed with the aid of the Statistical Package for Social Sciences (SPSS). Landsat satellite imagery for the years 2000; 2007; 2013 and 2018 were acquired and used for the computation of land use-land cover (LULC) and the Land Surface Temperature (LST) of the study area using ArcGIS 10.5. Between the years 2000 and 2018, built-up area increased by 8.78% at the expense of the non-built up land use. The residents were aware of UHI and climate change but characterized by superficiality. The study recommends a community awareness program on the menace of climate change and the integration of climate education into the curriculum of schools and other institutions of higher learning.