EPSG
Guide to the Illinois State Plane Coordinate System, https://clearinghouse.isgs.illinois.edu
2023-02-02
Engineering survey, topographic mapping (large and medium scale).
Part of the ICS83 33-zone system. Longitude of origin also given by information source as 271°30'E. State law defines grid unit as US survey foot. No equivalent metric definition.
United States (USA) - Illinois - counties of Boone, Dekalb, Kane, Kendall and McHenry.
(0,)
Definition: OGC Well Known Text
PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",41.25], PARAMETER["central_meridian",-88.5], PARAMETER["scale_factor",1.00003], PARAMETER["false_easting",1150012.7000254], PARAMETER["false_northing",149961.8999238]
Definition: OGC Well Known Text 2 (2019)
CONVERSION["Illinois Coordinate System of 1983 Aurora zone (US survey foot)", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",41.25, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",-88.5, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",1.00003, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",3773000, LENGTHUNIT["US survey foot",0.304800609601219], ID["EPSG",8806]], PARAMETER["False northing",492000, LENGTHUNIT["US survey foot",0.304800609601219], ID["EPSG",8807]], ID["EPSG",11233]]
Definition: ESRI Well Known Text
PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",1150012.7000254], PARAMETER["False_Northing",149961.8999238], PARAMETER["Central_Meridian",-88.5], PARAMETER["Scale_Factor",1.00003], PARAMETER["Latitude_Of_Origin",41.25]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Conversion", "name": "Illinois Coordinate System of 1983 Aurora zone (US survey foot)", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 41.25, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": -88.5, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 1.00003, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 3773000, "unit": { "type": "LinearUnit", "name": "US survey foot", "conversion_factor": 0.304800609601219 }, "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 492000, "unit": { "type": "LinearUnit", "name": "US survey foot", "conversion_factor": 0.304800609601219 }, "id": { "authority": "EPSG", "code": 8807 } } ], "id": { "authority": "EPSG", "code": 11233 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=tmerc +lat_0=41.25 +lon_0=-88.5 +k=1.00003 +x_0=1150012.7000254 +y_0=149961.8999238"> <Layer srs="+proj=tmerc +lat_0=41.25 +lon_0=-88.5 +k=1.00003 +x_0=1150012.7000254 +y_0=149961.8999238"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11233, 'EPSG', 11233, '+proj=tmerc +lat_0=41.25 +lon_0=-88.5 +k=1.00003 +x_0=1150012.7000254 +y_0=149961.8999238', 'PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",41.25],PARAMETER["central_meridian",-88.5],PARAMETER["scale_factor",1.00003],PARAMETER["false_easting",1150012.7000254],PARAMETER["false_northing",149961.8999238]');