Convert Naparima 1972 to WGS 84

Convert coordinates from Naparima 1972 (EPSG:4271) 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-4271-to-epsg-4326

Official EPSG transformations from Naparima 1972 to WGS 84

The EPSG Geodetic Parameter Dataset defines 2 transformations between Naparima 1972 (EPSG:4271) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

Naparima 1972 to WGS 84 (3)

EPSG:1307±26 mBest accuracy

Method:: Geocentric translations (geog2D domain)
Area of use:: Trinidad and Tobago - Tobago - onshore
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	-2	metre
Y-axis translation(ty)	374	metre
Z-axis translation(tz)	172	metre

DMA does not differentiate between Naparima 1955 (Trinidad) and Naparima 1972 (Tobago). Consequently for Trinidad IOGP has duplicated this transformation as Naparima 1955 to WGS 84 (3) - see code 1556.

Naparima 1972 to WGS 84 (1)

EPSG:1192±33 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Trinidad and Tobago - Tobago - onshore
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	-10	metre
Y-axis translation(ty)	375	metre
Z-axis translation(tz)	165	metre

CAUTION: IOGP believes that the coordinates used to derive these parameter values include a blunder, leading to an error in the value of tX. If a transformation from DMA is required IOGP recommends use of the 1987 version (EPSG codes 1307 and 1556).

Convert EPSG:4271 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4271", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4271 — Naparima 1972

geographic system using latitude and longitude on an ellipsoid · Area of use: Trinidad and Tobago - Tobago - onshore

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

More about EPSG:4271 →

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 Naparima 1972 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±26 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:4271 →