Investigating the Relative Uncertainty of the Degree of Urbanisations Output Classifications using Four Population Models, Nigeria

The purpose of this report is to assess the relative uncertainty of the degree of urbanisation's varying classification outputs — when inserting different population models into the tool for the same area. [...] Within the equation popi is the estimated population raster for the year, UNPD_pop is a constant raster representing the 2020 UNPD estimates, and country_tot_popi is a constant raster representing the total pop for the year (Sorichetta et al., 2015). [...] The Zonal Statistics (Spatial Analyst) produced the ‘Population Constant Raster’ using the sum function; whilst the Raster Calculator (Spatial Analyst) used the equation to produce the adjusted population counts. [...] The Nibble (Spatial Analyst) thereafter produced the ‘Settlement Output’; where the raster’s no data values indicate absence of buildings and possesses the same extent as the ‘Population Output’. [...] The structure of the Top-down Unconstrained population model is likely also the cause of the lower rural grid cell area allocation.