Abstract
SignA, the National Geographic Information System of Spain, has been a strategic project of the National Geographic Information Centre (CNIG) and the National Geographic Institute (IGN) of Spain, which aims the IGN data and services integration within a Geographic Information System (GIS), for its management, analyse and query through the Internet. This implies the development of an own versatile, interoperable and efficient geoportal. SignA geoportal was opened to public on December 2010 and it is about to open the fourth version, combining the best features of the Spatial Data Infrastructures (SDI) and GIS technologies, allowing users to access data and services in an easy and transparent way, without special technical knowledge. After 7 years, the geo- portal is growing every day its importance and usage onto the geomatics community. Currently, receives an average of 19,000 visits per month, being a tool of daily use for many of our users and for many applications. This article will be a brief review of the main features of the geoportal and the changes made to improve usability over the versions.
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