DFHRS-Computation as Part of Geodetic Infrastructures for GNSS-Positioning Services (GIPS)

To enable the full spectrum of GNSS usability, the establishment and maintenance of respective geodetic infrastructures for GNSS positioning services (GIPS) are required worldwide (see www.moldpos.eu).
Besides the geomonitoring component (GIPS-4) for GNSS-stations coordinate integrity monitoring as well as for their use as early-warning and disaster mitigation geomonitoring networks (www.monika.ag, www.goca.info), GIPS has two transformation components. Both transformation components concern the GNSS-consistent infrastructure for spatial information (cadastre, GIS, urban planning, precise outdoor/indoor navigation, construction, transportation, meteorology, land management, precise agriculture, etc.).
The horizontal transformation component (GIPS-1) is related to the georeferencing of spatial objects between the different modern regional ITRF-related frames (e.g. ETRF89 in Europe, SIRGAS in South America etc.) and the existing classical national reference frames (fig. 5). GIPS-1 requires the establishment of respective datum-transformation databases (see www.geozilla.de). These databases enable the set up of RTCM transformation messages (GIPS-3), and they can be for the used on GNSS controllers, in both cases as infrastructure for GNSS-positioning services. Further these transformation-parameter databases (GIPS-1) are needed interdisciplinarily in GIS-related applications.
The computation of HRS (Geoid N or QGeoid NQG) - as task of GIPS-2 - enables by H = h – N the conversion of ellipsoidal GNSS heights h to physical height H. GIPS-2 (www.dfhbf.de) is therefore the second essential transformation component and modern spatial infrastructure by enabling precise GNSS height-positioning in GNSS positioning services.

Fig. 5. Geodetic Infrastructures for GNSS Positioning Services (GIPS).