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Layer: GRID3 Lagos Settlement Extent (ID:3)

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Name: GRID3 Lagos Settlement Extent

Display Field: adm1_name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: SETTLEMENT EXTENTS:The Nigeria Settlement Extents Version 01.02. database are polygons representing areas where there is likely a human settlement based on the presence of buildings detected in satellite imagery. Settlement extents are not meant to represent the boundaries of an administrative unit or locality. A single settlement extent may be made up of multiple localities, especially in urban areas. Each settlement extent has an associated population estimate. Provided is information on the common operational boundary that the extent fully resides within along with their associated place codes (PCodes)The data are in geodatabase format and consist of a single-feature class combining built-up areas (BUA), small settlement areas (SSA), and hamlets (hamlets). A built-up area (BUA) is generally an area of urbanisation with moderately-to-densely-spaced buildings and a visible grid of streets and blocks. Built up areas are characterized as polygons containing 13 or more buildings across an area greater than or equal to 400,000 square meters.A small settlement (SSA) is a settled area of permanently inhabited structures and compounds of roughly a few hundred to a few thousand inhabitants. The housing pattern in SSAs is an assemblage of family compounds adjoining other similar habitations. Small settlement areas are characterized as polygons containing 50 or more buildings across an area less than 400,000 square meters. A hamlet is a collection of several compounds or sleeping houses in isolation from small settlements or urban areas. Hamlets are characterized as polygons containing between 1 and 49 buildings across an area less than 400,000 square meters.Extent: Nigeria: Admin Level 0 Boundaries. The overall extent of the layer is limited to the overall extent of the building footprint data set and may not reflect the extent of official administrative boundaries. Coordinate system: GCS WGS 1984.POPULATION ATTRIBUTES:The associated population estimates for the Settlement Extents datasets are derived from two WorldPop high resolution data sources. (1) The WorldPop Top-down constrained population estimates 2020 (Population) uses, for each country, the highest admin level official population totals of the 2000 and 2010 census rounds, that are publicly available and can be mapped to associated boundaries, and projects them to 2020. These projected values then disaggregated statistically to 100x100m resolution using a set of detailed geospatial datasets to disaggregate them to grid cell-based counts. The estimates are constrained to settlements based on the satellite-derived building footprint data from Maxar/ecopia for the 51 African countries, and based on a built settlement growth model of WorldPop for the remaining countries.(2) The Population Counts / Constrained Individual countries 2020 UN adjusted (100m resolution) population estimates (Pop_UN_adj) recognises that the United Nations produce their own estimates of national population totals. WorldPop, in order to provide flexibility to users, adjusted the number of people per pixel of its top-down constrained population estimates nationally to match the corresponding official United Nations population estimates (i.e. 2019 Revision of World Population Prospects).For more information about WorldPop’s methods, see: https://www.worldpop.org/methods/populations and https://www.worldpop.org/methods/top_down_constrained_vs_unconstrained"Population Counts / Constrained Individual countries 2020 (100m resolution)" & "Population Counts / Constrained Individual countries 2020 UN adjusted (100m resolution)" derived from WorldPop.org

Copyright Text: Center for International Earth Science Information Network (CIESIN), Columbia University and Novel-T. | Source of building Footprints “Ecopia Vector Maps Powered by Maxar Satellite Imagery”© 2020. | Source of population data "Population Counts / Constrained Individual countries 2020 (100m resolution)" & "Population Counts / Constrained Individual countries 2020 UN adjusted (100m resolution)" WorldPop.org © 2020 | Funding for the development and dissemination of this data set was provided by the Bill & Melinda Gates Foundation and United Kingdoms Foreign, Commonwealth, Development Office. | Suggested Data Set Citation: Center for International Earth Science Information Network (CIESIN), Columbia University and Novel-T. 2022. GRID3 Federal Republic of Nigeria Settlement Extents, Version 01.02. Palisades, NY: Geo-Referenced Infrastructure and Demographic Data for Development (GRID3). DOI: https://doi.org/10.7916/1tb8-bm49 Accessed DAY MONTH YEAR

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Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

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Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

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Supports Rollback On Failure Parameter: true

Last Edit Date: 5/11/2024 9:10:24 AM

Schema Last Edit Date: 5/11/2024 9:10:24 AM

Data Last Edit Date: 5/11/2024 9:10:24 AM

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