The article presents research on the evaluation of hidden map metadata. A hidden map is a map being part of a book that illustrates certain facts described in the book (e.g., military campaigns, political processes, migrations). The evaluation regards their completeness. Metadata completeness is the degree to which objects are described using all metadata elements. The analysis took into account the metadata of archival maps accessed via the GeoPortOst geoportal. Over 3000 hidden maps from the period 1572–2018 were analyzed, and the map set was divided into 8 collections. The main purpose of cartographers and librarians is to facilitate understanding of the relationship between individual information (librarians) and spatial data (cartographers). To this end, the research focused on the kind of information about old maps that should be stored in metadata to describe them in terms of space, time, content and context so as to increase their interoperability. The following metadata were taken into account in the assessment: title of content, type of content, date, date range, rights, language, subject, distribution format, geographic location, scale of map, reference system, mapping methods, map format, and source materials used to develop the map. The completeness of individual metadata as well as the completeness of metadata for individual collections was assessed. Finally, good practices of individual collections and metadata that could increase the interoperability of the entire collection were identified. The evaluation enables the owners to show the strengths and weaknesses of a given collection in a quick and easy way.

中文翻译：

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地图元数据：数字馆藏检索系统的基础

本文介绍了对隐藏地图元数据的评估研究。隐藏地图是属于书籍的一部分的地图，它说明了书中描述的某些事实（例如，军事战役，政治进程，移民）。评估会考虑其完整性。元数据完整性是使用所有元数据元素描述对象的程度。该分析考虑了通过GeoPortOst地理门户访问的档案地图的元数据。分析了1572-2018年期间的3000多种隐藏地图，并将地图集分为8个集合。制图师和图书馆员的主要目的是促进对个人信息（图书馆员）和空间数据（制图员）之间关系的理解。为此，该研究的重点是应存储在元数据中的有关旧地图的信息种类，以从空间，时间，内容和上下文方面对其进行描述，从而提高其互操作性。评估中考虑了以下元数据：内容标题，内容类型，日期，日期范围，权利，语言，主题，分发格式，地理位置，地图比例，参考系统，地图绘制方法，地图格式和用于开发地图的原始资料。评估了单个元数据的完整性以及单个集合的元数据的完整性。最后，确定了可以提高整个集合的互操作性的单个集合和元数据的良好实践。