Editing Digital raster graphic (section)

[[File:Topographic map example.png|thumb|300px|A small portion of a USGS DRG]]

A '''digital raster graphic''' ('''DRG''') is a [[digital image]] resulting from scanning a paper [[USGS]] [[topographic map]] for use on a computer.  DRGs created by USGS are typically scanned at 250 [[dpi]] and saved as a [[TIFF]].  The [[Raster graphics|raster]] image usually includes the original border information, referred to as the "map collar".  The map file is [[Universal Transverse Mercator|UTM]] [[map projection|projected]] and [[georeference]]d to the surface of the Earth.  DRG's are regularly used in [[Geographic information system|GIS]] applications. DRGs were first produced in 1995.