Center for Integrated Earth System Information (CIESIN), Columbia UniversityThe GRID3 NGA - Settlement Extents v4.0 dataset consists of a geographic representation of settlements in Nigeria. Settlement extents are further delineated into settlement blocks nested within urban and small settlement areas, generated from integrated road, railway, river, settlement extent, building footprint, and remote-sensing inputs. Each block is enriched with morphological, environmental and building metrics. This version supersedes GRID3 NGA - Settlement Extents v3.1. The following changes were made: - Creation of blocks in urban and semi-urban areas; and - Removal of falsely detected settlements identified during fieldwork Dataset citation: Center for Integrated Earth System Information (CIESIN), Columbia University. 2026. GRID3 NGA - Settlement Extents v4.0. New York: GRID3. (URL here) . Accessed (DAY MONTH YEAR). Contacts and data queries: The authors of this dataset appreciate feedback regarding the data, including suggestions, discovery of errors, difficulties in using the data, and format preferences. For dataset-related questions, please send an email to: info@ciesin.columbia.edugrid3-nga-settlement-extents-v4-0Humanitarian Data ExchangePublicGRID3 NGA - Settlement Extents v4.0DatasetsNigeria2016-01-01 to 2025-09-30