Digital Data Sets

US Geological Survey: DRG and DLG

• Digital Raster Graphic (DRG)

• images of USGS topographic maps

• UTM projection with NAD 1983 datum

• includes imagery, roads, toponymy names, elevation contours and boundaries

• Digital Line Graph (DLG)

• vector files generated on traditional paper topographic maps.

• shows info about geographic features, hydrography, townships & ranges, contour lines, rivers, lakes, roads, railroads, and towns

NCLD

• National Land Cover Database

• maps characterize land cover and land cover change

• Maps show: Land cover, land cover change index, urban imperviousness, urban impervious descriptor, NLCD science products (land cover change disturbance date, forest disturbance date, land cover change count, land cover with additional forest transition classes, U.S. forest service science tree canopy cover)

DOQs

• Digital Orthophoto Quadrangles

• computer generated image of aerial photo where image is displaced bc terrain relief and camera tilt had been removes

• here you can find coverage maps

NAIP

• National Agriculture Imagery Program

• Aerial imagery of crops during agricultural growing season in the US

• Can be in TIFF or JPEG format

NWI

• National Wetlands Inventory

• Can find maps of US wetland and deep water habitats

• provides information on wetland and deep water habitat type, location and trends to support research

NHD and NHDPlus

• National Hydrography Dataset

• show surface water and hydrological unit mapping in the US

STATGO and SSURGO

• Soil Survey Geographic Database

• information about soil collected over the course of the century

• can be displayed as tables or maps

DEMs

• Digital Elevation Models

• representation of the topographic surface of the bare Earth (excluding trees, buildings and any other objects on surface)

TIGER files

• Topologically Integrates Geographic Encoding and Referencing System

• represents US Census Bureau’s geospatial data ad primary source

• can find line shapefiles, geodatabases, line with demographic and economic data, cartographic boundary databases, cartographic boundary shapefiles, cartographic boundary KML