NEWS NOTES ON SUSTAINABLE WATER RESOURCESDigital Line Graphshttps://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-line-graphs-dlgs...

NEWS NOTES ON SUSTAINABLE WATER RESOURCESDigital Line Graphshttps://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-line-graphs-dlgs...

NEWS NOTES ON SUSTAINABLE WATER RESOURCESDigital Line Graphshttps://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-line-graphs-dlgs-intermediate-scale?qt-science_center_objects=0#qt-science_center_objectsDigital Line Graphs (DLGs) are digital vector representations of cartographic information derived from USGS maps and related sources.Intermediate-Scale (1:100,000-scale) DLGs are derived from USGS 30- by 60-minute quadrangle maps and are sold in 30- by 30-minute units that correspond to the east or west half of the topographic quadrangle maps. Each 30-minute unit is produced and distributed as four 15- by 15-minute cells. They are cast to the UTM projection system and are referenced to either NAD27 or NAD83.Depending on scale, the following layers (or categories of feature type) are available:Layer Feature TypePublic Land Survey System (PLSS) Township, range, and section linesBoundaries (BD) State, county, city, and other national and State lands such as forests and parksTransportation (TR) Roads and trails, railroads, pipelines, and transmission linesHydrography (HY) Flowing water, standing water, and wetlandsHypsography (HP) Contours and supplementary spot elevationsNon-vegetative features (NV) Glacial moraine, lava, sand, and gravelSurvey control and markers (SM) Horizontal and vertical monuments (third order or better)Man-made features (MS) Cultural features, such as buildings, not collected in other data categoriesVegetative surface cover (SC) Woods, scrub, orchards, and vineyards