EPSG codes: 31466, 31467, 31468, 31469 
AdV codes: DE_DHDN_3GK2, DE_DHDN_3GK3 DE_DHDN_3GK4, 
DE_DHDN_3GK5 

Note: in EPSG and AdV codes also format descriptions for 
coordinate data sets are included (order of coordinate 
values,  zone number) - may be defined differently  

CRS-EU description encloses all zones 2...5, GK_3 
indicates width of zone - 3 degree 

on GIS accuracy identical to DE_PD/83 / GK_3 and DE_RD/83 
/ GK_3 

Deutsches Hauptdreiecksnetz,
Rauenberg Datum, Potsdam Datum

Germany, Rauenberg,
Lat = 52°27'12.021" N,
Lon = 13°22'04.928" E

Germany, Federal States of former West Germany - 
Schleswig-Holstein, Niedersachsen, Nordrhein-Westfalen, 
Hessen, Rheinland-Pfalz, Saarland, Baden-Württemberg, 
Bayern 

- DHDN is up to a special degree of accuracy a uniform 
datum for all German Federal States, but at the cm level 
there exist different realisations with different 
additional names for DHDN e.g. LG 177 = Lagestatus 177  
- central point of former network Reichsdreiecksnetz, 
which was the basis of DHDN / PD/83 / RD/83 was Rauenberg 
in Berlin, this point was destroyed in 1910 and substitute 
by point Potsdam, therefore the aliases Rauenberg Datum and 
Potsdam Datum are known for German Datums 

Gauß Krüger Projection

Transverse Mercator Mapping Equations, in Hooijberg, 
Practical Geodesy, 1997, pages 81-84 

special German specification of Transverse Mercator 
Projection in zones of 3°, also known as Gauss Krüger 
System 

0°

central meridian (CM) of each zone
for DE: 6° E, 9° E, 12° E, 15° E in use

0 m

500 000  + (n * 10**6) m, with n...zone number 
e.g. 2 500 000 for zone number 2 (CM = 6° E)

1.0000

3°

n = longitude value of central meridian / 3
for DE: zones 2, 3, 4, 5