[Qgis-user] Transformation of vertical datum for points

[Bo Victor Thomsen]

Hi list -

I have a question regarding transformation of ellisoid heights to geoid 
heights..

I have a dataset consisting of points, where the z coordinate is a 
attribute column for the layer. (If necessary, this can be changed to a 
3 dimensional layer type - or the x, y values can be placed i 2 
attribute columns - whatever)

The data is in EPSG:32825 (UTM32N/ETRS89) and the present height values 
are ellisoid height values for this CRS.

I would like to transform the height values the the corresponding DVR90 
( EPSG:5799) geoid height values

Can this be done in QGIS using some kind of expression function. Or 
using ogr2ogr ? or Postgis ??

-- 
Med venlig hilsen / Best regards

Bo Victor Thomsen