DRG maps are short for Digital Raster Maps. These are maps that are scanned images of USGS standard series topographic maps. The image that is inside the map’s neatline is geo-referenced to the surface of the earth and fit to the Universal Transverse Mercator Projection. The horizontal positional accuracy and datum of the DRG matches the accuracy of the datum of the source map.
This is a DRG image of Bushkill PA.
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