EPSG:12104

Illinois Coordinate System of 1983 Marion zone (US survey foot)

Attributes

Data source: EPSG

Information source: Guide to the Illinois State Plane Coordinate System, https://clearinghouse.isgs.illinois.edu

Revision date: 2026-07-23

Scope: Engineering survey, topographic mapping (large and medium scale).

Remarks: Part of the ICS83 9-zone system. State law defines grid unit as US survey foot. No equivalent metric definition.

Method: Lambert Conic Conformal (1SP)

Area of use: United States (USA) - Illinois - Marion county.

Description: (0,)

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SimpleMap
United States (USA) - Illinois - Marion county.

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Definition: OGC Well Known Text

PROJECTION["Lambert_Conformal_Conic_1SP"],
PARAMETER["latitude_of_origin",38.65],
PARAMETER["central_meridian",-88.9166666666667],
PARAMETER["scale_factor",1.00001913],
PARAMETER["false_easting",21336.0426720853],
PARAMETER["false_northing",19812.0396240793]

Definition: OGC Well Known Text 2 (2019)

CONVERSION["Illinois Coordinate System of 1983 Marion zone (US survey foot)",
    METHOD["Lambert Conic Conformal (1SP)",
        ID["EPSG",9801]],
    PARAMETER["Latitude of natural origin",38.65,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8801]],
    PARAMETER["Longitude of natural origin",-88.9166666666667,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8802]],
    PARAMETER["Scale factor at natural origin",1.00001913,
        SCALEUNIT["unity",1],
        ID["EPSG",8805]],
    PARAMETER["False easting",70000,
        LENGTHUNIT["US survey foot",0.304800609601219],
        ID["EPSG",8806]],
    PARAMETER["False northing",65000,
        LENGTHUNIT["US survey foot",0.304800609601219],
        ID["EPSG",8807]],
    ID["EPSG",12104]]

Definition: ESRI Well Known Text

PROJECTION["Lambert_Conformal_Conic"],
PARAMETER["False_Easting",21336.0426720853],
PARAMETER["False_Northing",19812.0396240793],
PARAMETER["Central_Meridian",-88.9166666666667],
PARAMETER["Standard_Parallel_1",38.65],
PARAMETER["Scale_Factor",1.00001913],
PARAMETER["Latitude_Of_Origin",38.65]

Definition: PROJ.4

+proj=lcc +lat_1=38.65 +lat_0=38.65 +lon_0=-88.9166666666667 +k_0=1.00001913 +x_0=21336.0426720853 +y_0=19812.0396240793

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:12104","+proj=lcc +lat_1=38.65 +lat_0=38.65 +lon_0=-88.9166666666667 +k_0=1.00001913 +x_0=21336.0426720853 +y_0=19812.0396240793");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Conversion",
    "name": "Illinois Coordinate System of 1983 Marion zone (US survey foot)",
    "method": {
        "name": "Lambert Conic Conformal (1SP)",
        "id": {
            "authority": "EPSG",
            "code": 9801
        }
    },
    "parameters": [
        {
            "name": "Latitude of natural origin",
            "value": 38.65,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8801
            }
        },
        {
            "name": "Longitude of natural origin",
            "value": -88.9166666666667,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8802
            }
        },
        {
            "name": "Scale factor at natural origin",
            "value": 1.00001913,
            "unit": "unity",
            "id": {
                "authority": "EPSG",
                "code": 8805
            }
        },
        {
            "name": "False easting",
            "value": 70000,
            "unit": {
                "type": "LinearUnit",
                "name": "US survey foot",
                "conversion_factor": 0.304800609601219
            },
            "id": {
                "authority": "EPSG",
                "code": 8806
            }
        },
        {
            "name": "False northing",
            "value": 65000,
            "unit": {
                "type": "LinearUnit",
                "name": "US survey foot",
                "conversion_factor": 0.304800609601219
            },
            "id": {
                "authority": "EPSG",
                "code": 8807
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 12104
    }
}

Definition: GeoServer

12104=PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",38.65],PARAMETER["central_meridian",-88.9166666666667],PARAMETER["scale_factor",1.00001913],PARAMETER["false_easting",21336.0426720853],PARAMETER["false_northing",19812.0396240793]

Definition: MapServer - MAPfile

PROJECTION
	"proj=lcc"
	"lat_1=38.65"
	"lat_0=38.65"
	"lon_0=-88.9166666666667"
	"k_0=1.00001913"
	"x_0=21336.0426720853"
	"y_0=19812.0396240793"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=lcc +lat_1=38.65 +lat_0=38.65 +lon_0=-88.9166666666667 +k_0=1.00001913 +x_0=21336.0426720853 +y_0=19812.0396240793">
	<Layer srs="+proj=lcc +lat_1=38.65 +lat_0=38.65 +lon_0=-88.9166666666667 +k_0=1.00001913 +x_0=21336.0426720853 +y_0=19812.0396240793">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 12104, 'EPSG', 12104, '+proj=lcc +lat_1=38.65 +lat_0=38.65 +lon_0=-88.9166666666667 +k_0=1.00001913 +x_0=21336.0426720853 +y_0=19812.0396240793', 'PROJECTION["Lambert_Conformal_Conic_1SP"],PARAMETER["latitude_of_origin",38.65],PARAMETER["central_meridian",-88.9166666666667],PARAMETER["scale_factor",1.00001913],PARAMETER["false_easting",21336.0426720853],PARAMETER["false_northing",19812.0396240793]');