USGS map quadrangles
收藏DataONE2016-10-29 更新2024-06-26 收录
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资源简介：
USGS map quandrangle boundaries with names and unique identifiers
for the 1:24,000 (7.5 minute) quadrangles. Additional attributes
provide unique identifiers and hierarchical relationships between
these quadrangles and the enclosing 1:100,000 (30 x 60 minute) and
1:250,000 (1 x 2 degree) quadrangles.
创建时间：
2016-10-29
