American Memory: Technical summary
Other Map Collections
URL for collection:
http://lcweb2.loc.gov/ammem/gmdhtml/gmdhome.html
Collection Overview
- Description
-
A variety of early maps grouped under themes, including the first
delineations of Liberia
(1830-1870), a set of maps of the Yellowstone Valley and brand new first
National Park, various maps of colonial and revolutionary America, and an
1814 map of Lewis and Clark's track west.
- Source collection
-
n/a
- Technical features
- High resolution color images of maps; potential for use
in GIS systems.
- Original material formats
-
- Number of original items
- 52 (initial release), more to be added month by month
- Status of collection
- Initial release in March 1998.
- Public access
- The Library is not aware of any
restrictions that inhibit public access to items in this
collection.
See notes on rights and
restrictions provided by the Library to users of this collection.
Aids to intellectual access
- Type & granularity
- MARC bibliographic records. Each bib. record describes a single item.
- Linking to digital reproductions
- Bibliographic record contains identifier used in filenames for all
versions of image.
Digital reproductions
Total file-space for digital reproductions:
30 Gbytes (estimated)
Maps |
Archival image |
Service image |
Inline thumbnail |
Marker |
Filename extension ".tif" |
Filename extension ".sid" |
Filename extension ".gif" |
Formats |
TIFF uncompressed |
MrSID (
LizardTech wavelet compression) |
GIF |
Tonal resolution |
24 bit |
24 bit |
8 bit |
Spatial resolution
(approx) |
300 dpi |
300 dpi |
200x150 pixels |
Quantity (approx) |
52 (initial release) |
52 (initial release) |
52 (initial release) |
File size |
100-250 Mbytes |
3-9 Mbytes |
8-15 Kbytes |
Sample |
Sample
archival |
Sample
service |
Sample
thumbnail
|
Library of Congress contribution to Digital Libraries Initiative - Phase II
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