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The model has been developed in a collaboration between the Norwegian Mapping Authority, the Norwegian Polar Institute and Lokalstyret (the Local Board) in Longyearbyen. The primary goal of the collaboration was to strengthen the vertical reference frame in Longyearbyen as a preparation for a new mapping of the city. In this connection, GNSS was leveled and measured to improve both the physical and the ellipsoidal heights. Based on this, a new HREF model was developed. During the work, heights in Ny-Ålesund was also included after the physical height systems were harmonized. Various gravimetric geoid models were evaluated and one ended up with EGG2015
Geoid Heights Height reference model HREF imageryBaseMapsEarthCover
The HREF-model is a regular geographical grid (0,0208° x 0,0883°) describing the difference between physical and ellipsoidal heights on Svalbard. The modell is an adjustment of the European gravimetric model EGG2015 to the height systems in Longyearbyen and Ny-Ålesund, as well as tide gauge records on Halvmåneøya. As a resut the HREF-model has 0,264 - 0,315 m higher values in Longyearbyen compared to EGG2015 , 0,318 - 0,348 m higher in Ny-Ålesund and 0,256 m on Halvmåneøya. Outside these areas, the deviation quickly approaches a constant value of 0,295 m.

Note: This model must not be used with the SVD2006 height system, which was based on the ArcGP2006-sk geoid model.
Height reference model (fitted geoid model) on Svalbard