Convert HD1909 to WGS 84

Convert coordinates from HD1909 (EPSG:3819) to WGS 84 (EPSG:4326) — 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-3819-to-epsg-4326

Official EPSG transformation from HD1909 to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between HD1909 (EPSG:3819) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

HD1909 to WGS 84 (1)

EPSG:3817±3 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Hungary
Scope:: Topographic mapping.

Parameter	Value	Unit
X-axis translation(tx)	595.48	metre
Y-axis translation(ty)	121.69	metre
Z-axis translation(tz)	515.35	metre
X-axis rotation(rx)	-4.115	arc-second
Y-axis rotation(ry)	2.9383	arc-second
Z-axis rotation(rz)	-0.853	arc-second
Scale difference(ds)	-3.408	parts per million

Horizontal coordinates of 66 points of the National Geodetic Network were used to compute this transformation.

Convert EPSG:3819 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:3819", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:3819 — HD1909

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

+proj=longlat +ellps=bessel +towgs84=595.48,121.69,515.35,4.115,-2.9383,0.853,-3.408 +no_defs +type=crs

More about EPSG:3819 →

Target: EPSG:4326 — WGS 84

geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)

+proj=longlat +datum=WGS84 +no_defs +type=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting HD1909 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±3 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:4326 to EPSG:3819 →