Convert Pulkovo 1942(83) to BGS2005

Convert coordinates from Pulkovo 1942(83) (EPSG:4178) to BGS2005 (EPSG:7798) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4178-to-epsg-7798

Official EPSG transformation from Pulkovo 1942(83) to BGS2005

The EPSG Geodetic Parameter Dataset defines 1 transformation between Pulkovo 1942(83) (EPSG:4178) and BGS2005 (EPSG:7798). Its parameters, accuracy and area of use are listed below.

Pulkovo 1942(83) to BGS2005 (1)

EPSG:7806±5 m

Method:: Molodensky-Badekas (PV geog2D domain)
Area of use:: Bulgaria - onshore
Scope:: Geodesy, engineering survey, topographic mapping.

Parameter	Value	Unit
X-axis translation(tx)	5	metre
Y-axis translation(ty)	-133	metre
Z-axis translation(tz)	-104	metre
X-axis rotation(rx)	-1.4	arc-second
Y-axis rotation(ry)	-2	arc-second
Z-axis rotation(rz)	3.4	arc-second
Scale difference(ds)	-3.9901	parts per million
Pivot X(px)	4223032	metre
Pivot Y(py)	2032778	metre
Pivot Z(pz)	4309209	metre

Official transformation for converting existing geodetic and cartographic materials to BGS2005. Older CRSs (CS30, CS50, CS70) must first be transformed to Pulkovo 1942(83) before this transformation is applied.

Convert EPSG:4178 to EPSG:7798 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4178", "EPSG:7798", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4178 — Pulkovo 1942(83)

geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - onshore - eastern - S-42(83)

+proj=longlat +ellps=krass +no_defs +type=crs

More about EPSG:4178 →

Target: EPSG:7798 — BGS2005

geographic system using latitude and longitude on an ellipsoid · Area of use: Bulgaria

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs

More about EPSG:7798 →

Frequently asked questions

How accurate is converting Pulkovo 1942(83) to BGS2005?: The most accurate official EPSG transformation between these systems is accurate to about ±5 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation in a desktop GIS.
Does my data leave the browser when I use this converter?: No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.

Need the reverse? Convert EPSG:7798 to EPSG:4178 →