Slovakia_ETRS89h_to_EVRF2007.gtx

is official differential height correction grid intended to be used for transformation ellipsoidal
height on GRS80 ellipsoid to EVRF2007 normal height in the territory of Slovakia.
Grid is in NOAA VDatum Transformation Grid Format with a cell size 20 arcsec x 30 arcsec.

Slovakia_ETRS89h_to_EVRF2007.gtx grid represents the quasigeoid with the name DMQSK2014-E.
DMQSK2014-E uses the relation between Baltic1957 and EVRS (EVRF2007) on the basis of which
the DMRZ-H digital model of a residual component has been created using a selected set of 93
points. DMQSK2014-E has been subsequently obtained by simple subtracting of the model of this
residual component DMRZ-H from the DVRM05 quasigeoid model. On the basis of testing executed
on the independent points the standard deviation 1 sigma size 23 milimeters has been obtained.Hence it can
be said that the DMQSK2014-E precision is of precision comparable to DVRM05 i.e. it achieves
precision of technical levelling (obviously providing the high-quality determination of
ellipsoidal height). However, it should also be mentioned that the defined precision of the
DMQSK2014-E quasigeoid may be distorted by a low number of the test points.

For correct usage of this grid file always check your outputs with transformation service: https://zbgis.skgeodesy.sk/rts/en/Transform 

Source: https://www.geoportal.sk/en/geodetic-control/download/

License: CC BY, https://creativecommons.org/licenses/by/4.0/
Author: GKU Bratislava; year: 2014