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Geo.p.tial Techniques, a Sup.rlative Metho. to.Assess Urban Heat Island Intensity: The Case o. Abuja Municip.l, Nigeria

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Jo.rnal o. Geo.rap.ic Info.matio. System 2021年第1期13卷 52-64页

作者： M. E. Awuh p. o. japhets I. C. Enete Dep.rtment o. Geo.rap.y & p.anning University of Bamenda (UBa) Bamenda Cameroon Dep.rtment o. Geo.rap.y & Meteo.o.o.y Nnamdi Azikiwe University (NAU) Awka Nigeria

Mo.t cities aro.nd the wo.ld, including Abuja Municip.l are being faced with an undesirable increased in air temp.rature. This is indicated by an increase in no.-p.ro.s, no.-evap.rating, highly thermal co.ductive surfaces such as co.crete and asp.alt, which has rep.aced the vegetatio. bio.ass resulting to.the fo.matio. o. urban heat island. There is an increasing need fo. studies o. the changing trend o. UHI intensity in cities. This research emp.o.ed geo.p.tial techniques to.determine the urban heat island intensity in Abuja Municip.l. Temp.rature characteristics o.er twenty selected rural and urban lo.atio.s in Abuja, FCT were derived fro. the satellite image o. 1986, 2001 and 2016 using the “Extract Multi Values to.p.int” to.l in ArcGIS 10.4. These transects p.ss o.er vario.s landscap.s with different enviro.mental settings, with the aim o. understanding the facto.s shap.ng the city’s thermal landscap.. The intervals o. +15 years were deliberately cho.en to.ensure unifo.mity between the datasets. The results o. this analysis indicate that UHII has been increasing, fro. 1986-2016, giving credence to.the results o. the sp.tial and temp.ral analysis o. the land surface temp.rature, indicating the develo.0}ent p.ases had hit full stride. The different p.rio.s under study (1986, 2001 and 2016) were also.tested using the student “t” test to.determine the significant difference in the land surface temp.rature values to.ackno.ledge the p.esence o. a substantial urban heat island within the study area. The result reveals the calculated “t” values o. 2.50, 3.34, 5.57 o. 1986, 2001 and 2016 resp.ctively, are higher than the critical value o. “t” at 0.05 being 1.73, thus, revealing the temp.rature differences between the urban and rural statio.s to.be highly significant, indicating the p.esence o. a stro.g urban heat island. Also. a slide difference in the temp.rature was o.served with the Rubuchi and Karmajiji rural areas having higher temp.rature readings than their co.nter

关键词： Geo.p.tial Techniques Abuja Municip.l UHII Sup.rlative Metho.

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A Co.relatio. Analysis o. the Relatio.ship.between Land Use and Land Co.er/Land Surface Temp.rature in Abuja Municip.l, FCT, Nigeria

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Jo.rnal o. Geo.rap.ic Info.matio. System 2019年第1期11卷 44-55页

作者： M. E. Awuh p. o. japhets M. C. o.ficha A. o. o.o.ie I. C. Enete Dep.rtment o. Geo.rap.y & Meteo.o.o.y NAU Awka Nigeria Dep.rtment o. Architecture NAU Awka Nigeria Dep.rtment o. Architecture Chukwuemeka Odumegwu Ojukwu University Uli Nigeria

This study ado.0}ed Remo.e Sensing and GIS in assessing Land Use and Land Co.er (LULC)/Land Surface Temp.rature (LST) variatio. in Abuja Municip.l, FCT fro. 1986 to.2016. The thirty-year study p.rio. was cho.en with the sp.cific o.jective to.determine the relatio.ship.between LULC and LST using a co.relatio. analysis. Three Landsat TM/ETM+ images o. the study area (1986, 2001 and 2016) were used to.carry o.t the study. LULC was fo.nd to.increase by 246.96 km2 (86.4%) in areal extent o. built-up.between 1986 and 2016;the sp.tial extent o. the LST was fo.nd to.increase o. average fro. 23.5°C to.30.2°C. The co.relatio. analysis sho.ed a stro.g co.fficient o. determinatio. (r2). The co.relatio. analyses p.o.ed that the LULC classes were stro.gly related to.LST. A stro.g co.relatio. between the LULC classes and LST was o.served at 0.8266, 0.9486, and 0.77 fo. 1986, 2001, and 2016. The co.fficient o. determinatio. (r2) fo. 2016 was 0.77, being a stro.g indicato. that a stro.g relatio.ship.existed imp.ying that built-up.areas were majo. drivers o. the variatio. in the LST in Abuja Municip.l. To.p.o.o.e thermal co.fo.t in Abuja Municip.l, urban p.anning, and co.tro. o. building p.tterns tree-p.anting exercises are so.e o. the reco.mendatio.s made.

关键词： Co.relatio. Analysis Remo.e Sensing Abuja LULC/LST Relatio.ship

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