Convert coordinates from American Samoa 1962 (EPSG:4169) to NAD83(HARN) (EPSG:4152) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 3 transformations between American Samoa 1962 (EPSG:4169) and NAD83(HARN) (EPSG:4152). Each applies to a specific area — pick the one whose area of use covers your data.
Grid files: wshpgn.laswshpgn.los
NADCON method which expects longitudes positive west; EPSG GeogCRSs American Samoa 1962 and NAD83(HARN) (codes 4169 and 4152) have longitudes positive east. NADCON expects latitudes in northern hemisphere and values must be made positive prior to input.
Grid files: eshpgn.laseshpgn.los
NADCON method which expects longitudes positive west; EPSG GeogCRSs American Samoa 1962 and NAD83(HARN) (codes 4169 and 4152) have longitudes positive east. NADCON expects latitudes in northern hemisphere and values must be made positive prior to input.
Grid files: nadcon5.as62.nad83_1993.as.lat.trn.20160901.bnadcon5.as62.nad83_1993.as.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°.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4169", "EPSG:4152", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)geographic system using latitude and longitude on an ellipsoid · Area of use: American Samoa - 2 main island groups
+proj=longlat +ellps=clrk66 +towgs84=-115,118,426,0,0,0,0 +no_defs +type=crsMore about EPSG:4169 →
geographic system using latitude and longitude on an ellipsoid · Area of use: USA - HARN
+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crsMore about EPSG:4152 →