Fun with Geospatial Metadata, CUGIR, CORC, MARC, and OAI: The CSDGM to MARC Grant Project Adam...
-
date post
21-Dec-2015 -
Category
Documents
-
view
214 -
download
0
Transcript of Fun with Geospatial Metadata, CUGIR, CORC, MARC, and OAI: The CSDGM to MARC Grant Project Adam...
Fun with Geospatial Metadata, CUGIR, CORC, MARC, and OAI: The CSDGM to MARC
Grant Project
Adam Chandler, Olin LibraryElaine Westbrooks, Mann Library
Vivek Uppal, Dept. of Computer Science
Metadata Working GroupOctober 12, 2001
3
Problem
How do we create a persistent URL pointing to “deep web” digital objects across very different systems?
“A system for capturing, storing, checking, manipulating, analyzing and displaying data which are spatially referenced to the Earth.” (DoE, 1987)
6
What is GIS?
CUGIR
Brief HistorySubject areasUnrestricted access to data &
metadataNational Geospatial Data
Clearinghouse & NSDI
9
Geospatial Metadata
Brief HistoryDefinitionPurpose / Uses / BenefitsCUGIR Examples: TAZ
Content Standard for Digital Geospatial Metadata
10
What is CORC?PathfindersHarvests MetadataAuthority ControlClassification
Metadata: MARC / DC-RDF
11
CORC
18
http://130.11.52.184/servlet/FGDCServlet/retrieve?on=2&el=F&db=current&rp=3&mr=1&ac=current&cid=181
Non-Persistent URL
Clearinghouse Problems
0 hits for users 50% of time (unpublished research)
> 10% or more or nodes are offline (Z39.50)
FGDC Clearinghouse is not well known
Record maintenance is a undefined
Harvesting is not a part of model
Data/Metadata are coupled with the server software (i.e., “smart archive, dumb object” DL model)
19
Open Archives Initiative
Data Provider
Service Provider
http (get request)
xml response
low-barrier interoperability data-provider & service-provider model metadata harvesting model shared metadata format & parallel,
community-specific metadata formats authentication : on purpose outside protocolSource: Herbert Van De Sompel, CS 502, Spring 2001
20
23
“Buckets are part of the larger ‘Smart Object, Dumb Archive’ DL Model (Maly, Nelson, & Zubair, 1999). SODA is a reaction to the vertically integrated (and non-interoperable) DLs that tended to grow from the ad-hoc origins of many popular DLs (Esler & Nelson, 1998). Separating the functionality of the archive from that of the DL allows for greater interoperability and federation of DLs. The archive's purpose is to provide DLs the location of buckets (the DLs can poll the buckets themselves for their metadata), and the DLs build their own indexes.”
Buckets
Source: M. Nelson: “Smart Objects and Open Archives.” D-Lib Magazine, February 2001, 7(2) http://www.dlib.org/dlib/february01/nelson/02nelson.html
24
On Buckets and OAI
“Just as buckets break the dependency of the information objects on archives, the Open Archives Initiative (OAI) breaks the dependency of archives on DLs …”
- Michael L. Nelson
25
On Buckets and OAI
“The OAI does not address the issue of smart objects, but the archives in the OAI are very similar to the archives described in the SODA model in that they have minimal functionality. OAI archives aim for greater interoperability through performing less sophisticated functions (no keyword search functions defined, T&C is not handled at the protocol level) -- a sort of Reduced Instruction Set Computer philosophy for archives.”
- Michael L. Nelson
26
Problem Revisited
How do we create a persistent URL pointing to “deep web” digital objects across very different systems?