| Summary: | The International Association of Geodesy (AIG) introduced and defined, in 2015, the International Height Reference System (IHRS) as the conventional reference system for the global physical height determination. Following the conventions for the realisation of the IHRS, i.e. the determination of the International Height Reference Frame (IHRF), we utilize the existing GNSS reference stations in Greenland and Denmark to determine a local densification of the IHRF in these regions. In Greenland, we use Greenland GNSS Network (GNET), which is composed of about 60 continuously operating GNSS stations. In Denmark, we use the national reference frame composed of 14 continuously operating GNSS stations. The physical heights of these Danish and Greenlandic GNSS reference stations have been transformed from the local Danish and Greenlandic height systems, DVR90 and Nuuk-zero, respectively, to geopotential numbers (and normal heights) referring to the IHRF. This transformation relies on the existing precise local (quasi-)geoid models. This contribution describes the applied procedures and discusses the quality assessment of the results.
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