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 268°45'E. State law defines grid unit as US survey foot. No equivalent metric definition.
United States (USA) - Illinois - counties of Adams and Hancock.
(0,)
Definition: OGC Well Known Text
PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",36.75], PARAMETER["central_meridian",-91.25], PARAMETER["scale_factor",1.000023], PARAMETER["false_easting",2050088.9001778], PARAMETER["false_northing",149961.8999238]
Definition: OGC Well Known Text 2 (2019)
CONVERSION["Illinois Coordinate System of 1983 Quincy zone (US survey foot)", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",36.75, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",-91.25, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",1.000023, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",6726000, LENGTHUNIT["US survey foot",0.304800609601219], ID["EPSG",8806]], PARAMETER["False northing",492000, LENGTHUNIT["US survey foot",0.304800609601219], ID["EPSG",8807]], ID["EPSG",11246]]
Definition: ESRI Well Known Text
PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",2050088.9001778], PARAMETER["False_Northing",149961.8999238], PARAMETER["Central_Meridian",-91.25], PARAMETER["Scale_Factor",1.000023], PARAMETER["Latitude_Of_Origin",36.75]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Conversion", "name": "Illinois Coordinate System of 1983 Quincy zone (US survey foot)", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 36.75, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": -91.25, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 1.000023, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 6726000, "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": 11246 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=tmerc +lat_0=36.75 +lon_0=-91.25 +k=1.000023 +x_0=2050088.9001778 +y_0=149961.8999238"> <Layer srs="+proj=tmerc +lat_0=36.75 +lon_0=-91.25 +k=1.000023 +x_0=2050088.9001778 +y_0=149961.8999238"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11246, 'EPSG', 11246, '+proj=tmerc +lat_0=36.75 +lon_0=-91.25 +k=1.000023 +x_0=2050088.9001778 +y_0=149961.8999238', 'PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",36.75],PARAMETER["central_meridian",-91.25],PARAMETER["scale_factor",1.000023],PARAMETER["false_easting",2050088.9001778],PARAMETER["false_northing",149961.8999238]');