In this paper we explore visually the structure of the collection of a
digital research data archive in terms of metadata for deposited datasets. We
look into the distribution of datasets over different scientific fields; the
role of main depositors (persons and institutions) in different fields, and
main access choices for the deposited datasets. We argue that visual analytics
of metadata of collections can be used in multiple ways: to inform the archive
about structure and growth of its collection; to foster collections strategies;
and to check metadata consistency. We combine visual analytics and visual
enhanced browsing introducing a set of web-based, interactive visual interfaces
to the archive's collection. We discuss how text based search combined with
visual enhanced browsing enhances data access, navigation, and reuse.Comment: Submitted to the TPDL 201