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Aldwaik and Pontius developed the intensity analysis, a type of change detection, to quantify the behavior of a categorical variable across several time intervals to measure the degree to which changes are non-uniform at three levels: interval, category, and transition. The data input values for the intensity analysis were obtained from landuse and land cover classification of Lagos. For the landuse maps check "Landuse Map Old Lagos (Nigeria) 2009 and 2015"
The Map consist of 6 Local Government ares in Lagos which includes: Apapa, Ajeromi-Ifelodun, Amuwo-Odofin, Surulere, Lagos Island and Lagos Mainland). The Maps were generated using RapidEye image, a 5m resolution, using Object based image analysis.
Questionnaire were administered to 4 slum communities in Lagos: Ajegunle (203), Iwaya (75), Itire (54) and Ikorodu (52), to determine the movement pattern of slum dwellers, factors influencing the residential choices and reasons of the people to remain in Lagos slums/squatter communities. The sample unit was a household, and the respondent was generally the household head, or alternatively the oldest family member available older than 18 years. The data was processed using SPSS.