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A Digital Line Graph (DLG) is digital vector data representing cartographic information. DLGs contain a wide variety of information depicting geographic features (for example, hypsography, hydrography, boundaries, roads, utility lines, etc). DLGs are derived from hypsographic data (contour lines) using USGS 7.5-minute, 15-minute, 2-arc-second (30- by 60-minute), and 1:2 million-scale topographic quadrangle maps.

The 7.5- and 15-minute DLGs are within the large-scale category; the 2-arc-second DLGs are within the intermediate-scale category, and the 1:2 million-scale DLGs are within the small-scale category.

To learn more about DLGs, check out the Footer image. DLG page at the Crater Lake Data Clearinghouse Web site.

Data Download

The San Francisquito Creek project covers six USGS 7.5-minute quadrangles. These six quads have been mosaicked together for your convenience of viewing and analyzing the information throughout the area. Data are reprojected to one standard projection (UTM NAD27 zone 10 meters). Click on the following link to download the data:

hyd.zip (2.2 MB uncompressed) -- Files containing drainages and water bodies.

hyp.zip (29 MB uncompressed) -- Files containing contour lines.

roads.zip (12 MB uncompressed) -- Files containing roads and trails.


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Webmaster: Gary Sullivan, gsullivan@usgs.gov
Last Modified: Friday, 07-Feb-2003 22:42:49 EST (cmh)
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