GRID3 Djibouti Settlement Extents, Version 01.01

Settlement extents 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. This data product contains all information contained in the previous “GRID3 Djibouti Settlement Extents, Version 01” product, with updates. Updates in this version include: revised terms of use and license, Boundary and Place Codes for each settlement extent. This work has been undertaken as part of the Geo-Referenced Infrastructure and Demographic Data for Development (GRID3) programme. The programme is funded by the Bill & Melinda Gates Foundation and the United Kingdom's Foreign, Commonwealth & Development Office. It is implemented by the Flowminder Foundation, WorldPop at the University of Southampton, the United Nations Population Fund, and the Center for International Earth Science Information Network (CIESIN) at Columbia University. Keywords: Settlements, Hamlets, Built-up Areas (BUA), Small Settlement Areas (SSA)

居民点范围（Settlement extents）为多边形要素，指代基于卫星影像中检测到的建筑物分布，识别出的存在人类聚居活动的区域。居民点范围并非用于表示行政单元或聚居地的边界。单个居民点范围可由多个聚居地组成，在城市区域中尤为常见。每个居民点范围均配有对应的人口估算值。本数据集提供居民点范围完全隶属于的通用作业边界信息，以及与之关联的地点编码（PCodes）。本数据集采用地理数据库（Geodatabase）格式存储，仅包含单一要素类。本数据产品包含此前“GRID3 吉布提居民点范围 版本01”数据产品的全部信息，并新增多项更新内容。本版本的更新内容包括：修订后的使用条款与许可协议，以及每个居民点范围对应的边界与地点编码。本数据集作为“地理参考基础设施与发展人口数据计划（Geo-Referenced Infrastructure and Demographic Data for Development，简称GRID3）”的一部分完成开发。该计划由比尔及梅琳达·盖茨基金会与英国外交、联邦及发展事务部资助。本计划由Flowminder Foundation、南安普敦大学WorldPop项目、联合国人口基金，以及哥伦比亚大学国际地球科学信息网络中心（Center for International Earth Science Information Network，CIESIN）负责执行。关键词：居民点、小村庄、建成区（Built-up Areas，BUA）、小型居民点区域（Small Settlement Areas，SSA）