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Convert WGS 84 to WGS 84 + MSL height

Convert coordinates from WGS 84 (EPSG:4979) to WGS 84 + MSL height (EPSG:9705) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4979-to-epsg-9705

Official EPSG transformation from WGS 84 to WGS 84 + MSL height

The EPSG Geodetic Parameter Dataset defines 1 transformation between WGS 84 (EPSG:4979) and WGS 84 + MSL height (EPSG:9705). Its parameters, accuracy and area of use are listed below.

WGS 84 to WGS 84 + MSL height (1)

EPSG:9706±0.5 m
Method:
Geog3D to Geog2D+GravityRelatedHeight (EGM2008)
Area of use:
World
Scope:
Reversible geoid model transformation.

Grid file: Und_min1x1_egm2008_isw=82_WGS84_TideFree.gz

Reversible alternative to WGS 84 to MSL height (1) (code 8037). Parameter values are from WGS 84 to WGS 84 + EGM2008 height (2) (CT code 9618) assuming that the EGM2008 surface equals MSL surface within the accuracy of the transformation.

Convert EPSG:4979 to EPSG:9705 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4979", "EPSG:9705", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4979 — WGS 84

geographic system using latitude, longitude and ellipsoidal height · Area of use: World

+proj=longlat +datum=WGS84 +no_defs +type=crs
More about EPSG:4979 →

Target: EPSG:9705 — WGS 84 + MSL height

compound horizontal + vertical reference system · Area of use: World

+proj=longlat +datum=WGS84 +vunits=m +no_defs +type=crs
More about EPSG:9705 →

Frequently asked questions

How accurate is converting WGS 84 to WGS 84 + MSL height?
The most accurate official EPSG transformation between these systems is accurate to about ±0.5 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation (including the grid-shift files listed below) 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:9705 to EPSG:4979 →