Convert PSAD56 to SIRGAS 1995

Convert coordinates from PSAD56 (EPSG:4248) to SIRGAS 1995 (EPSG:4170) — 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-4248-to-epsg-4170

Official EPSG transformation from PSAD56 to SIRGAS 1995

The EPSG Geodetic Parameter Dataset defines 1 transformation between PSAD56 (EPSG:4248) and SIRGAS 1995 (EPSG:4170). Its parameters, accuracy and area of use are listed below.

PSAD56 to SIRGAS 1995 (1)

EPSG:3971±5 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Ecuador - mainland onshore
Scope:: Transformation of coordinates at 5m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	-60.31	metre
Y-axis translation(ty)	245.935	metre
Z-axis translation(tz)	31.008	metre
X-axis rotation(rx)	-12.324	arc-second
Y-axis rotation(ry)	-3.755	arc-second
Z-axis rotation(rz)	7.37	arc-second
Scale difference(ds)	0.447	parts per million

Derived at 42 points. May be taken as transformation PSAD56 to WGS 84 - see code 3990.

Convert EPSG:4248 to EPSG:4170 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4248", "EPSG:4170", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4248 — PSAD56

geographic system using latitude and longitude on an ellipsoid · Area of use: South America - PSAD56 by country

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

More about EPSG:4248 →

Target: EPSG:4170 — SIRGAS 1995

geographic system using latitude and longitude on an ellipsoid · Area of use: South America - SIRGAS 1995 by country

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

More about EPSG:4170 →

Frequently asked questions

How accurate is converting PSAD56 to SIRGAS 1995?: 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:4170 to EPSG:4248 →