A DRG (digital raster image) is a scanned image of a US geological survey topographic map. It is geo-referenced to the surface of the Earth and is fit to the Universal Transverse Mercator projection. 
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2008
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- Triangle Plot
- Index Value Plot
- Scatterplot
- Climograph
- Windrose
- Population Profile
- Bilateral Graph
- DOQQ
- DEM
- DLG
- DRG
- Isopleth
- Isopach
- Isohyet
- Isotach
- Infrared Aerial Photograph
- Isobar Map
- LIDAR
- Cartographic Animation
- Statistical Map
- Cartogram Map
- Doppler Radar
- Isoline Map
- Proportional Circle Map
- Choropleth Map
- Hypsometric Map
- Topographic Map
- Dot Distribution Map
- Black & White Aerial Photo
- Planimetric Map
- PLSS Map
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September
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