Digital Line Graphs (DLGs) Intermediate-Scale (1:100,000)
收藏U.S. Geological Survey2026-04-23 收录
下载链接：
https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-line-graphs-dlgs-intermediate-scale?qt-science_center_objects=0#qt-science_center_objects
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资源简介：
Intermediate-Scale (1:100,000-scale) DLGs are derived from USGS 30- by 60-minute quadrangle maps and are sold in 30- by 30-minute units that correspond to the east or west half of the topographic quadrangle maps. Each 30-minute unit is produced and distributed as four 15- by 15-minute cells. They are cast to the UTM projection system and are referenced to either NAD27 or NAD83.
提供机构：
Earth Resources Observation And Science Center
