EPSG:4401 NAD27 / BLM 1N (ftUS)
Projected system (Transverse Mercator) in use: USA - 180°W to 174°W - AK, OCS. The full definition below, and conversion in one click.
| Code | EPSG:4401 |
|---|---|
| Name | NAD27 / BLM 1N (ftUS) |
| Type | Projected system — Transverse Mercator |
| Area of use |
USA - 180°W to 174°W - AK, OCS United States (USA) - between 180°W and 174°W - Alaska and offshore continental shelf (OCS). |
| Bounds | W -180,00° · S 47,88° · E -173,99° · N 63,21° |
| Countries | United States |
| Datum | North American Datum 1927 |
| Ellipsoid | Clarke 1866 a = 6378206.4 m · 1/f = 294.978698214 |
| Base geographic system | EPSG:4267 — NAD27 |
| Unit | US survey foot (X east, Y north) |
| Transformation to WGS 84 | NAD27 to WGS 84 (21) (EPSG:1249) — accuracy 15 m |
| Scope | No official usage. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | -177 | 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=-177 +k=0.9996 +x_0=500000.001016002 +y_0=0 +a=6378206.4000000004 +rf=294.9786982139 +units=us-ft +towgs84=-2,152,149 +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:4401.
WKT (ESRI format, the .prj content)
PROJCS["NAD_1927_BLM_Zone_1N",GEOGCS["GCS_North_American_1927",DATUM["D_North_American_1927",SPHEROID["Clarke_1866",6378206.4,294.978698213898]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1640416.67],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-177.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["US survey foot",0.304800609601219]]Other systems — United States
- EPSG:4399NAD27 / BLM 59N (ftUS)
- EPSG:4400NAD27 / BLM 60N (ftUS)
- EPSG:4402NAD27 / BLM 2N (ftUS)
- EPSG:4403NAD27 / BLM 3N (ftUS)
- EPSG:4404NAD27 / BLM 4N (ftUS)
- EPSG:4405NAD27 / BLM 5N (ftUS)
- EPSG:4406NAD27 / BLM 6N (ftUS)
- EPSG:4407NAD27 / BLM 7N (ftUS)
- EPSG:4408NAD27 / BLM 8N (ftUS)
- EPSG:4409NAD27 / BLM 9N (ftUS)
- EPSG:4410NAD27 / BLM 10N (ftUS)
- 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)
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.