Digital Maps and Digital Map Reference Ed Redmond, Geography and Map Division, Library of Congress.
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Transcript of Digital Maps and Digital Map Reference Ed Redmond, Geography and Map Division, Library of Congress.
Brief History
1995G&M’s Digital Scanning
Lab • Digitization of Historic
Items• not “Born Digital”
• Research Quality images through the Internet
Scanning Goals:
• Research quality images (not facsimiles)• Access to surrogates without risking the
original item(s)• Controlled access – Voyager
– Persistent URLs (aka: Handles)– Digital IDs
• Example:http://hdl.loc.gov/loc.gmd/g3750.ct000097
©Scanning Priorities
• Popular items (cartobibliographies)
• Out of copyright (pre-1923 for U.S. publications and U.S. Government publications)
• Items with existing catalog records
Scanning with JumboScanner
This scanner uses an overhead camera that scans Red, then Green, then Blue. A full bed scan of over 3’x5’ takes about five minutes (same as with Tangent) to scan a 300dpi item 1:1 resolution
Processing
• Raw TIFF images are stored on a server
• DELLs:
– 200GB of RAM – 80GB hard drive– 160GB 2nd hard drive
• Adobe Photoshop • Aware JPEG2000
Metadata
• Metadata tables• Who, what, when, by whom, on which scanner,
what project, file name, file location, geographic location, and notes