Acquisition, storage and distribution of data and metadata of the Italian CGPS network (RING)

Abstract

In the framework of the development of the “Rete Integrata Nazionale GPS” of the Istituto Nazionale di Geofisica e Vulcanologia, we worked on the acquisition, storage and distribution of the data recorded by the network. We will show problems and solutions that we have faced, from the transmission stage to the final distribution of data and metadata of the recorded observations. In general, we have worked on software solutions to provide a quality check on the observation files that make use of java platform implemented with a front-end software for a rapid graphical time series restitution of common quality parameters as for multipath on L1 and L2, cycle slips and others, that can run easily on any operative system (namely “Clinic”). The observation files, and metadata of the network, are managed by a Knowledge Management infrastructure finalized to the web sharing management. The direct exposure on internet needs to interface all the modifying/querying processes of information contained in the database, by means of a software based on a framework of MVC type (Model View Controller), carried out on a J2EE platform (java2 Enterprise Edition). This system uses JSP (Java Server Page) and Servlet to allow, through HTTP protocol (Hyper Text Transfer Protocol), the management of devices in the field with dynamic HTML pages. A restricted access allows: creation and download of the CGPS log files, creation and download of the site monographic information, operations of files uploading and downloading from/to the central server, site status management and creation of time series plots. A web site, presently under construction but open within 2006, will access to the database and will be complemented with territorial and geographic data elaborated using a Geographical Information System (Ring WebGis). The WebGis is a user-friendly interface for reference territorial and cartographic data and for the development of the CGPS network. The HTML viewer allows the user to interact with geographical data using the common tools of a webgis (interrogation, selection etc.)