EPSG:4424 NAD83 / BLM 4N (ftUS)
Projected system (Transverse Mercator) in use: USA - 162°W to 156°W - AK, OCS. The full definition below, and conversion in one click.
| Code | EPSG:4424 |
|---|---|
| Name | NAD83 / BLM 4N (ftUS) |
| Type | Projected system — Transverse Mercator |
| Area of use |
USA - 162°W to 156°W - AK, OCS United States (USA) - between 162°W and 156°W - Alaska and offshore continental shelf (OCS). |
| Bounds | W -162,00° · S 50,98° · E -155,99° · N 74,71° |
| Countries | United States |
| Datum | North American Datum 1983 |
| Ellipsoid | GRS 1980 a = 6378137 m · 1/f = 298.257222101 |
| Base geographic system | EPSG:4269 — NAD83 |
| Unit | US survey foot (X east, Y north) |
| Transformation to WGS 84 | NAD83 to WGS 84 (1) (EPSG:1188) — accuracy 4 m |
| Scope | No official usage. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | -159 | degree |
| Scale factor at natural origin | 0.9996 | unity |
| False easting | 1640416.67 | US survey foot |
| False northing | 0 | US survey foot |
proj4 definition
+proj=tmerc +lat_0=0 +lon_0=-159 +k=0.9996 +x_0=500000.001016002 +y_0=0 +a=6378137 +rf=298.257222101 +units=us-ft +towgs84=0,0,0 +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:4424.
WKT (ESRI format, the .prj content)
PROJCS["NAD_1983_BLM_Zone_4N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1640416.67],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-159.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["US survey foot",0.304800609601219]]Other systems — United States
- EPSG:4411NAD27 / BLM 11N (ftUS)
- EPSG:4412NAD27 / BLM 12N (ftUS)
- EPSG:4413NAD27 / BLM 13N (ftUS)
- EPSG:4418NAD27 / BLM 18N (ftUS)
- EPSG:4419NAD27 / BLM 19N (ftUS)
- EPSG:4420NAD83 / BLM 60N (ftUS)
- EPSG:4421NAD83 / BLM 1N (ftUS)
- EPSG:4422NAD83 / BLM 2N (ftUS)
- EPSG:4423NAD83 / BLM 3N (ftUS)
- EPSG:4425NAD83 / BLM 5N (ftUS)
- EPSG:4426NAD83 / BLM 6N (ftUS)
- EPSG:4427NAD83 / BLM 7N (ftUS)
- EPSG:4428NAD83 / BLM 8N (ftUS)
- EPSG:4429NAD83 / BLM 9N (ftUS)
- EPSG:4430NAD83 / BLM 10N (ftUS)
- EPSG:4431NAD83 / BLM 11N (ftUS)
- EPSG:4432NAD83 / BLM 12N (ftUS)
- EPSG:4433NAD83 / BLM 13N (ftUS)
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.