Digital Line Graphs are digital maps that are distributed by the US Geological Survey. They are collected from the USGS maps and are distributed within 9 different categories of physical features.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTyj2f-JzivZkX1kYD8J_GWFVKyvr_Mggnar1WlotE7mZkMG3sAoOKbHNKuoarFeQWoUh3ktddMu747y0t4iTltAYnuywhmsLlhvJBE8GXB7TyYjyoVmgNJf_fr67dnZW57r1iEJa5Tepo/s320/Image6.gif)
This map shows contours, roads and lakes using different sets of data acquired from the USGS.
http://web.wt.net/daba/dlg/default.html
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