The National Geospatial Digital Archive (NGDA) is one of eight initial projects funded by the Library of Congress's National Digital Information Infrastructure and Preservation Program (NDIIPP). The project's overarching goal is to answer the question: How can we preserve geospatial data on a national scale and make it available to future generations? This paper summarizes the project's work in four areas: analysis of the characteristics of geospatial data relevant to preservation; elucidation of the “relay” principles of long-term preservation; development of an OAIS-compliant archive system; and development of a wiki- and repository-based format registry.
Greg Janée, "Preserving Geospatial Data: The National Geospatial Digital Archive's Approach" in Proc. IS&T Archiving 2009, 2009, pp 25 - 29, https://doi.org/10.2352/issn.2168-3204.2009.6.1.art00007