EPSG:4122 ATS77
Geographic system in latitude and longitude, in use: Canada - Maritime Provinces. Datum, ellipsoid and transformation to WGS 84 below.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:4122 |
|---|---|
| Name | ATS77 |
| Type | Geographic system |
| Area of use |
Canada - Maritime Provinces Canada - New Brunswick; Nova Scotia; Prince Edward Island. |
| Bounds | W -69,05° · S 43,41° · E -59,73° · N 48,07° |
| Countries | Canada |
| Datum | Average Terrestrial System 1977 |
| Ellipsoid | Average Terrestrial System 1977 a = 6378135 m · 1/f = 298.257 |
| Unit | degree (Lat north, Lon east) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Geodesy. |
proj4 definition
+proj=longlat +a=6378135 +rf=298.257 +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:4122.
WKT (ESRI format, the .prj content)
GEOGCS["GCS_ATS_1977",DATUM["D_ATS_1977",SPHEROID["ATS_1977",6378135.0,298.257]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]Other systems — Canada
- EPSG:3761NAD83(CSRS) / UTM zone 22N
- EPSG:3771NAD27 / Alberta 3TM ref merid 111 W
- EPSG:3772NAD27 / Alberta 3TM ref merid 114 W
- EPSG:3773NAD27 / Alberta 3TM ref merid 117 W
- EPSG:3775NAD83 / Alberta 3TM ref merid 111 W
- EPSG:3776NAD83 / Alberta 3TM ref merid 114 W
- EPSG:3777NAD83 / Alberta 3TM ref merid 117 W
- EPSG:3779NAD83(CSRS) / Alberta 3TM ref merid 111 W
- EPSG:3780NAD83(CSRS) / Alberta 3TM ref merid 114 W
- EPSG:3781NAD83(CSRS) / Alberta 3TM ref merid 117 W
- EPSG:3797NAD27 / MTQ Lambert
- EPSG:3798NAD83 / MTQ Lambert
- EPSG:3799NAD83(CSRS) / MTQ Lambert
- EPSG:3800NAD27 / Alberta 3TM ref merid 120 W
- EPSG:3801NAD83 / Alberta 3TM ref merid 120 W
- EPSG:3802NAD83(CSRS) / Alberta 3TM ref merid 120 W
- EPSG:3978NAD83 / Canada Atlas Lambert
- EPSG:3979NAD83(CSRS) / Canada Atlas Lambert
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.