Project

Title
North Carolina Geologic Maps Scanning and Georeferencing Project  
Geographic Area
North Carolina; maps partially extend into bordering states of Virginia, Tennessee, Georgia, South Carolina  
Organization
NCSU Libraries  

Descriptive Information

Url
http://www.lib.ncsu.edu/gis/geolmaps.html  
Status
Ongoing  
Publisher
United States Geologic Survey, North Carolina Geologic Survey, various graduate theses and dissertations  
Metadata Compiled
Yes  
Metadata Format
FGDC  
Num Items
 
Scale
varies  
Years
1905 - 2005
Description
Geologic and topographic maps are being collected, scanned, georeferenced, and preserved by the NCSU Libraries as part of the North Carolina Geospatial Data Archiving Project in collaboration with the US Library of Congress. The legacy geologic and topographic maps have no digital counterparts and paper copies are scarcely accessible. Geologic and historic maps are in high demand, and are critical for earth science instruction and research. Digital georeferencing provides new capabilities not possible with paper maps by allowing other data to be overlaid by using GIS software. Geologic maps, including collars, are scanned to a 300dpi TIF file with a large format (42 inch) scanner. Using ArcMap 9.1's georeferencing extension, at least four geographic locations were interactively selected from the TIFF based on coordinates and grids printed on the maps. ArcMap creates a table of these selected coordinate values, and with USACE CoprsCon software, each coordinate pair is converted to NC Stateplane NAD83 meters and then appended to the table. ArcMap then creates a .TFW world file and transforms the TIFF image so that it is represented in the data view in Stateplane Coordinates. Each image file is rectified with ArcInfo workstation and compressed with MrSID. As of March 2006, the inventory consists of 115 U.S. Geological Survey geologic maps, 136 North Carolina Geological Survey geologic maps, 47 maps from theses and dissertations, and 165 legacy 15-minute topographic maps, all of which are backed up on multiple secure servers. Data are disseminated through the NC Department of Environment and Natural Resources and NCSU Libraries, and contributed to NCOneMap and the National Geologic Map Database and National Geologic Map Image Library.  

Technical Information

Download Available
Yes  
File Format (Original Scan)
TIFF  
File Format (Display)
SID  
Resolution
300 ppi  
Compression Ratio
20:1  
Image Management Software
 
Geo Referenced
Yes  
Rectified
Yes  
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Contact Information

Organization
NCSU Libraries  
Name
Jeff Essic  
E-Mail
jeff_essic@ncsu.edu  
Phone
919-515-5698