U.S. Census Grids (Summary File 1), 1990: Metropolitan Statistical Areas
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The U.S. Census Grids (Summary File 1), 1990: Metropolitan Statistical Areas data set contains grids of demographic and socioeconomic data from the year 1990 U.S. census in ASCII andGeoTIFF formats for 39 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 1990 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1）1990：都市统计区域数据集收录了1990年美国人口普查中关于人口与社会经济数据的网格，这些数据以ASCII和GeoTIFF格式呈现，涵盖了39个人口至少为一百万的都市统计区域。网格分辨率为7.5弧秒（约等于0.002075十进制度），相当于约250平方米。网格变量基于1990年人口普查TIGER/Line文件中的普查区块地理信息以及普查变量（人口、家庭和住房变量）。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。
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