EPSG:3781 NAD83(CSRS) / Alberta 3TM ref merid 117 W
Système projeté (Transverse Mercator) en usage : Canada - Alberta - 118.5°W to 115.5°W. La définition complète ci-dessous, et la conversion en un clic.
| Code | EPSG:3781 |
|---|---|
| Nom | NAD83(CSRS) / Alberta 3TM ref merid 117 W |
| Type | Système projeté — Transverse Mercator |
| Zone d'usage |
Canada - Alberta - 118.5°W to 115.5°W Canada - Alberta - between 118°30'W and 115°30' W. |
| Emprise | O -118,50° · S 50,77° · E -115,50° · N 60,00° |
| Pays | Canada |
| Datum | NAD83 Canadian Spatial Reference System |
| Ellipsoïde | GRS 1980 a = 6378137 m · 1/f = 298.257222101 |
| Système géographique de base | EPSG:4617 — NAD83(CSRS) |
| Unité | metre (E east, N north) |
| Transformation vers WGS 84 | NAD83(CSRS) to WGS 84 (2) (EPSG:1946) — précision 1 m |
| Usage | Cadastre, survey control and engineering survey in urban areas, typically in all municipalities that previously comprised the 73 Municipal Integrated Surveying and Mapping (MISAM) areas, also known as urban cadastral map areas. For rural areas use UTM. |
Paramètres de la projection
| Paramètre | Valeur | Unité |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | -117 | degree |
| Scale factor at natural origin | 0.9999 | unity |
| False easting | 0 | metre |
| False northing | 0 | metre |
Définition proj4
+proj=tmerc +lat_0=0 +lon_0=-117 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +towgs84=-0.991,1.9072,0.5129,0.02579,0.00965,0.01166,0 +no_defsÀ coller dans QGIS, proj4js, PostGIS (spatial_ref_sys) ou GDAL. +towgs84 porte la transformation EPSG vers WGS 84 ; le code officiel reste EPSG:3781.
WKT (format ESRI, contenu du .prj)
PROJCS["NAD_1983_CSRS_3TM_117",GEOGCS["GCS_North_American_1983_CSRS",DATUM["D_North_American_1983_CSRS",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-117.0],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]Autres systèmes — Canada
- EPSG:3581NAD83(CSRS) / NWT Lambert
- 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: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 : registre EPSG v11.022 (IOGP), via la base PROJ. Vérifiez toujours un code sur epsg.org avant un travail contractuel.