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NASA Socioeconomic Data and Applications Center (SEDAC) Documentation for the Global Human Settlement Layers (GHSL): Population and Built-Up Estimates, and Degree of Urbanization Settlement Model Grid, v1 (1975, 1990, 2000, 2014, 2015) 1 Documentation last revised July 19, 2021. Documentation for the Global Human Settlement Layers (GHSL): Population and Built-Up Estimates, and Degree of Urbanization Settlement Model Grid July 2021 Joint Research Centre (JRC), European Commission Center for International Earth Science Information Network (CIESIN), Columbia University Abstract This document outlines the basic methodology and data sets used to construct the Global Human Settlement Layer (GHSL) data set, along with use cases, limitations, and use constraints. GHSL contains layers of Built-Up grid (GHS-BUILT), Population grid (GHS-POP), and the Settlement Model grid (GHS-SMOD) conveniently packaged by epochs, 1975, 1990, 2000, and 2014 for GHS-BUILT, and 2015 for GHS-POP and GHS-SMOD. Data ...