EPSG:6129 Sister Islands National Grid 1961
Projected system (Transverse Mercator) in use: Cayman Islands - Little Cayman and Cayman Brac. The full definition below, and conversion in one click.
| Code | EPSG:6129 |
|---|---|
| Name | Sister Islands National Grid 1961 |
| Type | Projected system — Transverse Mercator |
| Area of use | Cayman Islands - Little Cayman and Cayman Brac |
| Bounds | W -80,14° · S 19,63° · E -79,69° · N 19,78° |
| Countries | Cayman Islands |
| Datum | Sister Islands Geodetic Datum 1961 |
| Ellipsoid | Clarke 1866 a = 6378206.4 m · 1/f = 294.978698214 |
| Base geographic system | EPSG:4726 — SIGD61 |
| Unit | foot (E east, N north) |
| Transformation to WGS 84 | SIGD61 to WGS 84 (3) (EPSG:6143) — accuracy 1 m |
| Scope | Cadastre, engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 0 | degree |
| Longitude of natural origin | -81 | degree |
| Scale factor at natural origin | 0.9996 | unity |
| False easting | 1640419.9475 | foot |
| False northing | 0 | foot |
proj4 definition
+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +units=ft +towgs84=8.853,-52.644,180.304,-0.393,-2.323,2.96,-24.081 +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:6129.
WKT (ESRI format, the .prj content)
PROJCS["Sister_Islands_National_Grid_1961",GEOGCS["GCS_Little_Cayman_1961",DATUM["D_Little_Cayman_1961",SPHEROID["Clarke_1866",6378206.4,294.978698213898]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1640419.9475],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-81.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["foot",0.3048]]Other systems — Cayman Islands
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.