Digital Map Of Base of Aquifer for High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming

This data set consists of digital base of aquifer elevation
contours for the High Plains aquifer in the central United
States. The High Plains aquifer extends from south of 32
degrees to almost 44 degrees north latitude and from 96 degrees
30 minutes to almost 104 degrees west longitude. The outcrop
area covers 174,000 square miles and is present in Colorado,
Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and
Wyoming.

This digital data set was created by digitizing the base of
aquifer elevation contours from a 1:1,000,000 base map created
by the U.S. Geological Survey High Plains RASA project
(Gutentag, E.D., Heimes, F.J., Krothe, N.C., Luckey, R.R., and
Weeks, J.B., 1984, Geohydrology of the High Plains aquifer in
parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South
Dakota, Texas, and Wyoming: U.S. Geological Survey Professional
Paper 1400-B, 63 p.) The data should not be used at scales
larger than 1:1,000,000.

本数据集涵盖美国中部高平原含水层（High Plains aquifer）的含水层海拔等值线数字化基底。该高平原含水层的地理范围为北纬32°以南至近北纬44°，西经96°30′至近西经104°。其出露面积达17.4万平方英里，分布于科罗拉多州、堪萨斯州、内布拉斯加州、新墨西哥州、俄克拉荷马州、南达科他州、得克萨斯州及怀俄明州境内。
本数字化数据集通过对美国地质调查局（U.S. Geological Survey）高平原RASA项目所制1:100万比例尺底图的含水层海拔等值线基底进行数字化处理构建而成（Gutentag ED、Heimes FJ、Krothe NC、Luckey RR及Weeks JB，1984：《科罗拉多、堪萨斯、内布拉斯加、新墨西哥、俄克拉荷马、南达科他、得克萨斯及怀俄明部分区域高平原含水层水文地质》，美国地质调查局专业报告1400-B，共63页）。本数据集仅可在不大于1:100万的比例尺下使用。