http://images.google.com/imgres?imgurl=http://www.versamap.com/UsgsDlg_CaNvAzUt.png&imgrefurl=http://www.versamap.com/webdoc08.htm&h=520&w=620&sz=21&hl=en&start=11&tbnid=7L-wTCi4NFJBGM:&tbnh=114&tbnw=136&prev=/images%3Fq%3DDigital%2BLine%2BGraph%26gbv%3D2%26hl%3DenThe above image is a DLG (Digital Line Graph) of the Southwest area of the United States. A digital line graph is a digital representation of the features displayed on a USGS topographic map and in numerous scales. The digital line graph are separated into four layers: boundaries, transportation, surface water and contours.
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