1:250,000-scale Hydrologic Units of the United States
收藏data.gov2026-01-10 收录
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The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a number of data layers which were of interest...
地理信息检索与分析系统（Geographic Information Retrieval and Analysis System，GIRAS）于20世纪70年代中期开发，旨在将一批具有研究价值的数据图层转化为数字形式……
