DFHRS - Nordrhein-Westphalen 2004 and 2006

The computation of the DFHRS databases for NN- and for nomal heights, respectively were done in cooperation between Ingenieurbüro Seiler (www.ib-seiler.de) and IAF/HSKA.

The quality of DFRHS database Nordrhein-Westfalen is again 1cm. The fig. below shows the isolines of the HRS N(B,L), computed with DFHRS-software version according to the approach stage 1, formulas (2a-f).

Fig.: Isolines N(B,L) of the 1 cm DFHRS database Nordrhein-Westfalen