1 / 8

Content Access Characterization in Digital Libraries

This paper presents a structured approach to accessing geospatial resources in digital libraries, emphasizing the importance of meaningful interactions with complex datasets. We discuss various access points, including service-based and direct downloads, while highlighting the significance of content standards such as Dublin Core and FGDC. Additionally, we explore the framework's implications for programmatic clients and integration with access control mechanisms, aiming to improve user experience in navigating vast and multifaceted geospatial information.

cala
Télécharger la présentation

Content Access Characterization in Digital Libraries

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Content Access Characterizationin Digital Libraries Greg Janée • James Frew • David Valentine University of California, Santa Barbara

  2. Motivation • Provide meaningful, useful access to geospatial resources • Geospatial resources are... • complex assemblages of components • large • accessible in various modes • often offer service-based access • Close ties to data analysis environments • e.g., GIS

  3. Context identifier DL resource bucket view browse view access view others...

  4. Related work • Content standards • Dublin Core: URLs • FGDC: multiple “distributions” • METS • powerful, but complex • doesn’t make key distinctions

  5. ADL access framework • “Access point” • a single, independently accessible representation of the resource or subcomponent of the resource • four types • Hierarchy mechanisms • Decomposition (multipart) • Alternatives • multiple equivalent formats • individual components vs. single aggregate • NB: hierarchy mechanisms nest

  6. Types of access points • Download • URL; format, MIME type, encodings, size • Service • URL; protocol, definition • Web interface • URL • Offline • reference or citation

  7. Example • U.S. Geological Survey “Digital Raster Graphic”(scanned topographic map) • multiple components (files) • image • georeferencing data • multiple access options • download TIFF • access via MrSID (hierarchical multiresolution) • multiple offline locations • depository libraries

  8. Conclusion • Simple access framework • 4 types of “access points” • 2 hierarchy mechanisms: alternatives, decomposition • Captures key distinctions important to programmatic clients • Outstanding issues • integration with access control mechanisms • role of conversion services

More Related