Convert coordinates from ETRS89 (EPSG:4937) to ETRS89 + Baltic 1957 height (EPSG:8360) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 2 transformations between ETRS89 (EPSG:4937) and ETRS89 + Baltic 1957 height (EPSG:8360). Each applies to a specific area — pick the one whose area of use covers your data.
Grid file: Slovakia_ETRS89h_to_Baltic1957.gtx
Uses ETRS89 (realization ETRF2000) and quasigeoid model DVRM05. 1 sigma = 34 mm (test performed on 563 independent points). Recommended as part of transformation between Baltic 1957 height and EVRF2007 height (see concatenated operation code 8363).
Grid file: CR2005_GTX.gtx
Reversible alternative to ETRS89 to Baltic 1957 height (2) (code 10567).
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4937", "EPSG:8360", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude, longitude and ellipsoidal height · Area of use: Europe - ETRF by country
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4937 →
compound horizontal + vertical reference system · Area of use: Europe - Czechoslovakia
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +vunits=m +no_defs +type=crsMore about EPSG:8360 →