Digital Raster Graph:
High-Resolution DRG Scans
About the Data
The USGS has performed high-resolution scanning on existing topo sheets. GeoPDF® is used to present GIS and mapping data in a standard Adobe Systems PDF.
When were the Maps Created?
The original Florida DRGs were made between 1951 and 1993. The files on this FTP site have been photorevised in the 1980s and 1990s. The photorevision date appears in the file name.Complete information is located in the lower right-hand corner of the image. NOTE: These PDFs were created by the USGS, not LABINS.
Determining the File Name
Use the USGS Quad Name Index to find the quad sheet name.
- Sample file name: FL_Alachua_1993_geo.pdf
- FL = Florida
- Alachua = the quad name
- 1993 = the year of photorevision or scan
Special Software Needed
- GeoPDF® is a published extension (OGC 08-139r1) to the Adobe PDF file format, from TerraGo Technologies. It is used to present GIS and mapping data in a standard Adobe Systems PDF.
- Download your free viewer from TerraGo Technologies
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