The Colorado Plateau coal assessment study area, 2000 (cpstdyg)

This is a coverage of the Colorado Plateau coal assessment
study area. The study area outline was drawn on the county
lines that most closely outline the coal-bearing rocks in
the Colorado Plateau Region. The county outlines originate
from a national coverage for which lines were extracted from
U.S. Census 1990 TIGER/line files using an AML program
written by Nebert, D., and Negri, M., USGS-Water Resources
Division (WRD), running on two Data General 6220 servers.

本数据集涵盖科罗拉多高原（Colorado Plateau）煤炭评估研究区。该研究区的边界以最贴合科罗拉多高原地区含煤岩系分布范围的县界为基准绘制。县界数据源自一套国家级数据集，其边界线由美国地质调查局水资源部（USGS-Water Resources Division, WRD）的Nebert D.与Negri M.编写的AML程序（Arc Macro Language），从1990年美国人口普查局TIGER/线文件（U.S. Census 1990 TIGER/line files）中提取，并在两台Data General 6220服务器上运行生成。