U.S. Census Grids (Summary File 1), 2000: Metropolitan Statistical Areas

U.S. Census Grids (Summary File 1), 2000: Metropolitan Statistical Areas contain 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). To provide gridded demographic data, including characteristics of age, race, ethnicity, and housing, for metropolitan statistical areas at a finer resolution than is available in the 30 arc-second grids used for the United States as a whole.2000年美国人口普查网格（汇总文件1）：大都市区数据集收录了50个人口不少于100万的大都市区（Metropolitan Statistical Areas）的2000年美国人口普查人口与社会经济数据网格，数据格式为ASCII与地理光栅（GeoTIFF）。该网格的分辨率为7.5角秒（0.002075十进制度），约合250平方米。网格化变量基于2000年美国人口普查TIGER/线文件（TIGER/Line Files）的普查区块地理信息，以及人口、家庭与住房相关普查变量。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。 本数据集旨在为大都市区提供分辨率高于全美通用的30角秒网格的网格化人口统计数据，涵盖年龄、种族、族裔与住房特征等维度。