Unit: metre
Data source: EPSG
Information source: Land Survey Office (ZU), Prague, www.cuzk.cz/zu. See also Georg Strasser "Ellipsoidiche Parameter der Erdfigur 1800-1950".
Revision date: 2017-05-24
Remarks: Defined as log a = 6.5266022 Klafter (Austrian fathom, Kl), log b = 6.5251990 Kl. a=10^6.526 6022 = 3362035 Kl. Then using the Austro-Hungarian 1871 KL/m legal ratio of 1.89648384, a = 6376045m
Definition: OGC Well Known Text
SPHEROID["Zach 1812",6376045,310, AUTHORITY["EPSG","1026"]]
Definition: OGC Well Known Text 2 (2019)
ELLIPSOID["Zach 1812",6376045,310, LENGTHUNIT["metre",1], ID["EPSG",1026]]
Definition: ESRI Well Known Text
SPHEROID["Zach_1812",6376045.0,310.0]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "Ellipsoid", "name": "Zach 1812", "semi_major_axis": 6376045, "inverse_flattening": 310, "id": { "authority": "EPSG", "code": 1026 } }