Spatio-temporal Analysis For Monitoring Urban Growth Using Geospatial Tools A Case Study Of Adama City Ethiopia

Rapid and unprecedented urban growth is becoming the characteristics of cities in developingrncountries. Hence, it is normal to assess and monitor urban growth changes using necessary tornquantify urban sprawl that provide paramount information for, policy makers, resource managers andrnurban planners. This study was conducted in Adama city to examine and quantify spatio-temporalrntrends and patterns of urban growth during 1994–2017. Landsat5 TM image for 1994 and aerialrnphotos of 2004 and 2017 were used for this study. Three different land-cover maps produced atrndifferent intervals between 1994 and 2017 were used to evaluate and analyze urban growth visuallyrnand quantitatively. The satellite images were classified and land-use/land-cover maps were producedrnusing maximum likelihood supervised classification method. The classification process was checkedrnby producer’s, user’s, overall accuracy and Kappa statistic accuracy assessments from confusionrnmetrics. Results show acceptable agreement between the classified maps and reference data with arnproducer’s accuracy value >70.6%, and user’s accuracy >80%. Post classification change detectionrnanalysis and selected spatial metric indices calculation were made to detect, assess and monitorrnurban growth and the quantify LU/LC changes in the study area. Change detection analysis indicatedrnthat Adama is growing rapidly with an average growth rate of 7.3% per year during1944–2017. Thernbuilt-up area was 45.26 km2, 74.4 km2and 153.67km2, respectively in 1994, 2004 and 2017, withrnannual growth rates of 6.4% and 8.1% in the two study phases. The areas had annual spatialrnexpansion indices of 6.4% and 8.19%, respectively during the periods 1994−2004 andrn2004−2017.From spatial metrics analysis, combined number of built-up area patches was 345,rn473and 717 for the years 1994, 2004 and 2017. The increase in the number of patches all through thernstudy periods shows the rapid urban growth process in the study area. Therefore, it is time for policyrnmakers, city managers and urban planners to plan and cope up with the pace of Adama urban growthrndepending on with proper implementation.

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