Libraries within their role and mission use GIS in order to provide added value services for geographical collections they have developed. Although GIS initially was used by geographers the interdisciplinary aspect of geographic information extended their use in a number of disciplines (eg analysis of archaeological data, natural resources management, detect of medical phenomena) turning them into a tool capable of combining different data sources, thus attracting a wide number of users. In the above context, the present work aims primarily to clarify terms such as “geographic information”,“geographical collections”,“geospatial data” and “geographical information systems” as international literature indicates. Furthermore it will attempt the outline of geospatial collection development policy role and librarians’ as well in building services associated with this type of information.As the development of technology and open access offers to users multiple possibilities of utilizing the provided information, librarians by evaluating their current needs and requirements that arise, make respective broadening and strengthening of their skills in order to remain effective in dealing with the variety of their duties.