EPSG:2791 NAD83(HARN) / Illinois West
Projected system (Transverse Mercator) in use: USA - Illinois - SPCS - W. The full definition below, and conversion in one click.
| Code | EPSG:2791 |
|---|---|
| Name | NAD83(HARN) / Illinois West |
| Type | Projected system — Transverse Mercator |
| Area of use |
USA - Illinois - SPCS - W United States (USA) - Illinois - counties of Adams; Alexander; Bond; Brown; Bureau; Calhoun; Carroll; Cass; Christian; Clinton; Fulton; Greene; Hancock; Henderson; Henry; Jackson; Jersey; Jo Daviess; Knox; Lee; Logan; Macoupin; Madison; Marshall; Mason; McDonough; Menard; Mercer; Monroe; Montgomery; Morgan; Ogle; Peoria; Perry; Pike; Pulaski; Putnam; Randolph; Rock Island; Sangamon; Schuyler; Scott; St Clair; Stark; Stephenson; Tazewell; Union; Warren; Washington; Whiteside; Winnebago; Woodford. |
| Bounds | W -91,52° · S 36,97° · E -88,92° · N 42,51° |
| Countries | United States |
| Datum | NAD83 (High Accuracy Reference Network) |
| Ellipsoid | GRS 1980 a = 6378137 m · 1/f = 298.257222101 |
| Base geographic system | EPSG:4152 — NAD83(HARN) |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | NAD83(HARN) to WGS 84 (3) (EPSG:1901) — accuracy 1 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 36.666666666666664 | degree |
| Longitude of natural origin | -90.16666666666667 | degree |
| Scale factor at natural origin | 0.999941177 | unity |
| False easting | 700000 | metre |
| False northing | 0 | metre |
proj4 definition
+proj=tmerc +lat_0=36.6666666666667 +lon_0=-90.1666666666667 +k=0.999941177 +x_0=700000 +y_0=0 +ellps=GRS80 +units=m +towgs84=-0.991,1.9072,0.5129,0.02579,0.00965,0.01166,0 +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:2791.
WKT (ESRI format, the .prj content)
PROJCS["NAD_1983_HARN_StatePlane_Illinois_West_FIPS_1202",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",700000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-90.1666666666667],PARAMETER["Scale_Factor",0.999941177],PARAMETER["Latitude_Of_Origin",36.6666666666667],UNIT["Meter",1.0]]Other systems — United States
- EPSG:2782NAD83(HARN) / Hawaii zone 1
- EPSG:2783NAD83(HARN) / Hawaii zone 2
- EPSG:2784NAD83(HARN) / Hawaii zone 3
- EPSG:2785NAD83(HARN) / Hawaii zone 4
- EPSG:2786NAD83(HARN) / Hawaii zone 5
- EPSG:2787NAD83(HARN) / Idaho East
- EPSG:2788NAD83(HARN) / Idaho Central
- EPSG:2789NAD83(HARN) / Idaho West
- EPSG:2790NAD83(HARN) / Illinois East
- EPSG:2792NAD83(HARN) / Indiana East
- EPSG:2793NAD83(HARN) / Indiana West
- EPSG:2794NAD83(HARN) / Iowa North
- EPSG:2795NAD83(HARN) / Iowa South
- EPSG:2796NAD83(HARN) / Kansas North
- EPSG:2797NAD83(HARN) / Kansas South
- EPSG:2798NAD83(HARN) / Kentucky North
- EPSG:2799NAD83(HARN) / Kentucky South
- EPSG:2800NAD83(HARN) / Louisiana North
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.