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Geoid models

Here you can download the national geoid models for RH 2000 and RH 70.

More information about geoid models can be found at the pages about the geoid.

SWEN17_RH2000

SWEN17_RH2000 is a geoid model that has been adjusted to SWEREF 99 and the height system RH 2000. The model is based on a gravimetric geoid model in combination with interpolation of GNSS/levelling residuals to make the transition from heights above the ellipsoid in SWEREF 99 to heights above sea level in RH 2000. The postglacial land uplift between the reference epoch of SWEREF 99, which is 1999.5, and the reference epoch of RH 2000, which is 2000.0, has been taken into account.

The standard uncertainty of SWEN17_RH2000 has been estimated to 8–10 mm everywhere on the Swedish mainland, Öland and Gotland, with exception of a few areas where the uncertainty is larger. These areas are in the far north on the border to Norway and in the lake Vättern (standard uncertainty approximately 2–3 cm) and the highest mountains to the north-west, depending on the difficulties to model a gravimetric model in mountainous areas (standard uncertainty about 2‑4 cm). At sea, the standard uncertainty is also larger; about 2–3 cm in coastal waters and probably around 5–10 cm further out.

The geoid model is represented by geoid heights in a regular grid, from which geoid heights at other points can be calculated using an appropriate interpolation method, e.g. bicubic splines. Bilinear interpolation using the four closest nodal points will result in a slightly larger interpolation error, but still very small compared to the uncertainty of the geoid model. Compared to prior geoid models, the grid resolution is twice as high. The resolution is the same as for the underlying gravimetric geoid model, i.e., 0.01 x 0.02 degrees, in order not to miss out on high-frequent information in the gravimetric geoid model. However, this means that the geoid files are larger.

The geoid model is available for download in three different formats, either as a binary grid or two different ASCII formats. The geoid files, as well as interpolated control points, can be found in the list below.

SWEN17_RH70

SWEN17_RH70 is the corresponding model for conversion from SWEREF 99 to the older height system RH 70. This model has been computed from SWEN17_RH2000 by taking into account the difference between the two height systems in question. The model accounts for the postglacial land uplift and interpolation of the GNSS/levelling residuals is utilized. The postglacial land uplift correction refers to 29.5 years of uplift, between the reference epoch of SWEREF 99 (1999.5) and the reference epoch of RH 70 which is 1970.0.

The standard uncertainty of SWEN17_RH70, close to the benchmarks of the national precise levelling network, is similar to the one of SWEN17_RH2000 on land, under the assumption that RH 70 is considered as realised by the RH 70 heights of stable benchmarks along the precision lines of the second precise levelling and the RHB 70 heights for the benchmarks of the third precise levelling.

Files from Lantmäteriet

Lantmäteriet's geoid models SWEN17_RH2000 and SWEN17_RH70 are distributed under the open data licence Creative commons, CC0 (new window).

SWEN17_RH2000

SWEN17_RH70

Control points

Files from suppliers of GNSS equipment and software

SWEN17_RH2000

SWEN17_RH70

Interactive computation of geoid height

Compute geoid height, using the SWEN17 models.

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