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Convert Vientiane 1982 to Lao 1997

Convert coordinates from Vientiane 1982 (EPSG:4676) to Lao 1997 (EPSG:4678) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4676-to-epsg-4678

Official EPSG transformation from Vientiane 1982 to Lao 1997

The EPSG Geodetic Parameter Dataset defines 1 transformation between Vientiane 1982 (EPSG:4676) and Lao 1997 (EPSG:4678). Its parameters, accuracy and area of use are listed below.

Vientiane 1982 to Lao 1997 (1)

EPSG:1063±2 m
Method:
Geocentric translations (geog2D domain)
Area of use:
Laos
Scope:
Transformation of coordinates at 2m level of accuracy.
ParameterValueUnit
X-axis translation(tx)-2.227metre
Y-axis translation(ty)6.524metre
Z-axis translation(tz)2.178metre

Derived at 8 stations.

Convert EPSG:4676 to EPSG:4678 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4676", "EPSG:4678", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4676 — Vientiane 1982

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

+proj=longlat +ellps=krass +no_defs +type=crs
More about EPSG:4676 →

Target: EPSG:4678 — Lao 1997

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

+proj=longlat +ellps=krass +towgs84=44.585,-131.212,-39.544,0,0,0,0 +no_defs +type=crs
More about EPSG:4678 →

Frequently asked questions

How accurate is converting Vientiane 1982 to Lao 1997?
The most accurate official EPSG transformation between these systems is accurate to about ±2 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:4678 to EPSG:4676 →