Land Surface Temperature Mapping using Geoinformation Techniques

Chukwuka Friday Agbor,Esther Oluwafunmilayo Makinde

doi:10.14311/gi.17.1.2

Abstract

General environmental management, which involves monitoring and modeling, requires the information of the Land surface temperature (LST) status of area concerned. Land surface temperature has gained relevance recognition over the years and there is need to develop approaches that can determine LST using satellite images. This study was conducted in Akure which has experienced rapid urbanization in recent time. The study utilized Landsat data of 1984, 1990, 2000, 2003, 2014 and 2016. The temperature data were derived from Landsat images using remote sensing algorithms for assessing LST from thermal infrared (TIR) data (bands 6 and 10). These data were processed and analyzed using tools in Idrisi and ArcGIS software systems. Satellite-derived land surface temperatures were validated with in-situ temperature data. The results revealed parabolic increase in temperature over the years and the changing pattern was investigated by adopting existing ecological indexes.. The validation operation revealed average bias value of between remote sensing- and ground-based data. This implies that remote sensing technique is reliable and therefore could be employed for large scale temperature mapping. The results could be used in mitigating urban heat island effectssuch as heat-related stress and ill-timed human deaths.

Highlights

Akure has experienced rapid development and high growth of urbanization in the past few decades
Urban heat island is a major outcome of urban expansion that leads to temperature increase in the city in comparison to suburbs (Liu et al 2011)
For those pixels composed of soil and vegetation, the method uses the following simplified equation (Sobrino et al, 2002).: ε = εsλ + Pv where, εv and εs are respectively, the soil and vegetation emissivity, Pv is the proportion of vegetation

Summary

Introduction

Akure has experienced rapid development and high growth of urbanization in the past few decades. These environmental transformations have changed the physical and natural environment of the area. Urban encroachment has been obvious on the suburbs and this has transformed rural environment into a new urban landscape. The land surface transformation in the city and the disappearance of vegetation cover by paved surfaces are some of the causes of urban heat island (UHI) development (Voogt, 1984). Urban heat island is a major outcome of urban expansion that leads to temperature increase in the city in comparison to suburbs (Liu et al 2011). Urban heat island (UHI) has long been a concern for more than four decades (Liqin et al, 2008)

Methods

Findings

Discussion

Conclusion