USGS Topographic Maps

Download Single File Interface Multi-file Download Tool Website Directory View Online Interactive Map Connect using GIS Metadata Data Provider

Dataset Basics

The Digital Raster Graphic (DRG) is a scanned, digital image of a US Geological Survey (USGS) standard series topographic map. The original DRG images included the full map extent and surrounding map collar information. To produce the DRGe product, the USGS removed map collars and appended portions of surrounding map images to create rectangular images which are suitable for seamless tiling in a geographic information system.

The ISDP archive includes the following map series:

• 7.5-minute series (1:24,000)
• 30 x 60-minute series (1:100,000)
• 1 x 2 degree series (1:250,000)

Download free GeoPDF versions of topo maps from the USGS Store.

Building pyramids on a DRG may corrupt the color ramp associated with the TIFF and cause the image to be displayed without color. If this occurs, simply delete the pyramid file (extension .rrd) to view the image with an appropriate color ramp.  If ArcGIS asks if you would like to build pyramids, select No.

Coordinate System:  UTM, Zone 16 North
Horizontal Datum:  NAD27 (both NAD27 and NAD83 worldfiles are included with archives)
File Format:  GeoTiff (5-10 MB/File)
Resolution: scanned at 250 dots per inch