Low Elevation Coastal Zone (LECZ) Urban-Rural Population and Land Area Estimates, Version 2

The Low Elevation Coastal Zone (LECZ) Urban-Rural Population and Land Area Estimates, Version 2 data set consists of country-level estimates of urban population, rural population, total population and land area country-wide and in LECZs for years 1990, 2000, 2010, and 2100. The LECZs were derived from Shuttle Radar Topography Mission (SRTM), 3 arc-second (~90m) data which were post processed by ISciences LLC to include only elevations less than 20m contiguous to coastlines; and to supplement SRTM data in northern and southern latitudes. The population and land area statistics presented herein are summarized at the low coastal elevations of less than or equal to 1m, 3m, 5m, 7m, 9m, 10m, 12m, and 20m. Additionally, estimates are provided for elevations greater than 20m, and nationally. The spatial coverage of this data set includes 202 of the 232 countries and statistical areas delineated in the Gridded Rural-Urban Mapping Project version 1 (GRUMPv1) data set. The 30 omitted areas were not included because they were landlocked, or otherwise lacked coastal features. This data set makes use of the population inputs of GRUMPv1 allocated at 3 arc-seconds to match the SRTM elevations, and at 30 arc-seconds resolution in order to reflect uncertainty levels in the product resulting from the interplay of input population data resolutions (based on census Units) and the elevation data. Urban and rural areas are differentiated by the GRUMPv1 Urban Extents. This data set is produced by the Columbia University Center for International Earth Science Information Network (CIESIN).

《低海拔沿海地带（LECZ）城乡人口与土地面积估算（版本2）》数据集，包含了对各国1990年、2000年、2010年和2100年的城市人口、乡村人口、总人口及全国及LECZ地区的土地面积的国家级估算。该LECZs源自航天雷达地形测量任务（SRTM）的3弧秒（约90米）数据，经ISciences LLC后处理，仅包括低于20米且连续接壤海岸线的海拔；并补充了SRTM在南北纬度上的数据。本数据集中展示的人口和土地面积统计数据，按低于或等于1米、3米、5米、7米、9米、10米、12米和20米的海拔低沿海地带进行汇总。此外，还提供了高于20米海拔及全国范围内的估算。本数据集的空间覆盖范围包括GRUMPv1数据集版本1中划定的232个国家及统计区域的202个。遗漏的30个区域未包括，原因在于其为内陆地区或缺乏沿海特征。本数据集利用GRUMPv1的人口输入，分配至3弧秒以匹配SRTM的海拔数据，并在30弧秒分辨率下进行估算，以反映由于输入人口数据分辨率（基于人口普查单位）与海拔数据交互作用而产生的产品不确定性水平。城乡区域通过GRUMPv1城市范围进行区分。本数据集由哥伦比亚大学国际地球科学信息网络中心（CIESIN）制作。