G-DQM is a data process able to quality check Hg data set. The following figure describes the data analysis process. After data gathering, data is stored in databases managed by the Spatial Data Infrastructure (SDI) developed at CNR-IIA (https://sdi.iia.cnr.it) . The G-DQM (GMOS-Data Quality Management) was developed in a web context, with web user interfaces able to control the quality check process. G-DQM, as research prototype, was released by the GMOS (http://www.gmos.eu/) project and later improved in the iGOSP research framework.