DLG
http://weather.unisys.com/usgs/3sec/index.php
A DLG is a Digital Line Graph that is used in GIS systems in order to show a certain area or region. They have the ability to show different types of geographic activity such as boundaries, hydrography, vegetation and so forth. The map above is demonstrating different elevations in the United States. By using the legend, you can determine the different elevation based on the colors on the map.
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