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Convert St. Lawrence Island to NAD83

Convert coordinates from St. Lawrence Island (EPSG:4136) to NAD83 (EPSG:4269) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4136-to-epsg-4269

Official EPSG transformations from St. Lawrence Island to NAD83

The EPSG Geodetic Parameter Dataset defines 2 transformations between St. Lawrence Island (EPSG:4136) and NAD83 (EPSG:4269). Each applies to a specific area — pick the one whose area of use covers your data.

St. Lawrence Island to NAD83 (1)

EPSG:1455±0.5 mBest accuracy
Method:
NADCON
Area of use:
USA - Alaska - St. Lawrence Island
Scope:
Transformation of coordinates at 0.5m level of accuracy.

Grid files: stlrnc.lasstlrnc.los

Accuracy 0.5m at 67% confidence level. Uses NADCON method which expects longitudes positive west; source and target CRSs have longitudes positive east. NADCON data converts from St. Lawrence Datum but makes the transformation appear to be from NAD27.

St. Lawrence Island to NAD83 (2)

EPSG:8547±0.5 m
Method:
NADCON5 (2D)
Area of use:
USA - Alaska - St. Lawrence Island
Scope:
Geodesy.

Grid files: nadcon5.sl1952.nad83_1986.stlawrence.lat.trn.20160901.bnadcon5.sl1952.nad83_1986.stlawrence.lon.trn.20160901.b

Uses NADCON5 method which expects longitudes positive east in range 0-360°; EPSG source and target CRSs have longitudes positive east in range -180° to +180°.

Convert EPSG:4136 to EPSG:4269 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4136", "EPSG:4269", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4136 — St. Lawrence Island

geographic system using latitude and longitude on an ellipsoid · Area of use: USA - Alaska - St. Lawrence Island

+proj=longlat +ellps=clrk66 +no_defs +type=crs
More about EPSG:4136 →

Target: EPSG:4269 — NAD83

geographic system using latitude and longitude on an ellipsoid · Area of use: North America - NAD83

+proj=longlat +datum=NAD83 +no_defs +type=crs
More about EPSG:4269 →

Frequently asked questions

How accurate is converting St. Lawrence Island to NAD83?
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:4269 to EPSG:4136 →