U.S. Census Grids (Summary File 3), 2000: Metropolitan Statistical Areas

The U.S. Census Grids (Summary File 3), 2000: Metropolitan Statistical Areas data set contains grids of demographic and socioeconomic data from the year 2000 U.S. census in ASCII and GeoTIFF formats for 50 metropolitan statistical areas with at least one million in population. The grids have a resolution of 7.5 arc-seconds (0.002075 decimal degrees), or approximately 250 square meters. The gridded variables are based on census block geography from Census 2000 TIGER/Line Files and census variables (population, households, and housing variables). This data set is produced by the Columbia University Center for International Earth Science Information Network (CIESIN).

美国人口普查网格（概要文件3）2000年：大都市统计区域数据集收录了来自2000年美国人口普查的、以ASCII和GeoTIFF格式存储的、涵盖50个人口至少为一百万的大都市统计区域的 demographic 和 socioeconomic 数据网格。这些网格的分辨率为7.5弧秒（约等于0.002075十进制度），相当于大约250平方米。网格变量基于来自2000年TIGER/Line文件的普查区块地理信息和普查变量（人口、家庭和住房变量）。该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。