EPSG:11351

Montana Interstate 83 (international foot)

Attributes

Data source: EPSG

Information source: Rocky Mountain Tribal Transportation Association RMTCRS Handbook and User Guide; https://www.marls.com/wp-content/uploads/2025/10/RMCRS-Manual-v2.0.pdf

Revision date: 2026-02-10

Scope: Engineering survey.

Remarks: For authoritative metric definition see code 11350. Working unit is International feet (note: not US Survey feet).

Method: Hotine Oblique Mercator (variant B)

Area of use: United States (USA) - Montana - Interstate.

Description: (0,)

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United States (USA) - Montana - Interstate.

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Definition: OGC Well Known Text

PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["latitude_of_center",47.05],
PARAMETER["longitude_of_center",-104.65],
PARAMETER["azimuth",31],
PARAMETER["rectified_grid_angle",31],
PARAMETER["scale_factor",1.000105],
PARAMETER["false_easting",199999.9999992],
PARAMETER["false_northing",225000.00000672]

Definition: OGC Well Known Text 2 (2019)

CONVERSION["Montana Interstate 83 (international foot)",
    METHOD["Hotine Oblique Mercator (variant B)",
        ID["EPSG",9815]],
    PARAMETER["Latitude of projection centre",47.05,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8811]],
    PARAMETER["Longitude of projection centre",-104.65,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8812]],
    PARAMETER["Azimuth at projection centre",31,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8813]],
    PARAMETER["Angle from Rectified to Skew Grid",31,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8814]],
    PARAMETER["Scale factor at projection centre",1.000105,
        SCALEUNIT["unity",1],
        ID["EPSG",8815]],
    PARAMETER["Easting at projection centre",656167.979,
        LENGTHUNIT["foot",0.3048],
        ID["EPSG",8816]],
    PARAMETER["Northing at projection centre",738188.9764,
        LENGTHUNIT["foot",0.3048],
        ID["EPSG",8817]],
    ID["EPSG",11351]]

Definition: ESRI Well Known Text

PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["False_Easting",199999.9999992],
PARAMETER["False_Northing",225000.00000672],
PARAMETER["Scale_Factor",1.000105],
PARAMETER["Azimuth",31.0],
PARAMETER["Longitude_Of_Center",-104.65],
PARAMETER["Latitude_Of_Center",47.05]

Definition: PROJ.4

+proj=omerc +lat_0=47.05 +lonc=-104.65 +alpha=31 +gamma=31 +k=1.000105 +x_0=199999.9999992 +y_0=225000.00000672

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11351","+proj=omerc +lat_0=47.05 +lonc=-104.65 +alpha=31 +gamma=31 +k=1.000105 +x_0=199999.9999992 +y_0=225000.00000672");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Conversion",
    "name": "Montana Interstate 83 (international foot)",
    "method": {
        "name": "Hotine Oblique Mercator (variant B)",
        "id": {
            "authority": "EPSG",
            "code": 9815
        }
    },
    "parameters": [
        {
            "name": "Latitude of projection centre",
            "value": 47.05,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8811
            }
        },
        {
            "name": "Longitude of projection centre",
            "value": -104.65,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8812
            }
        },
        {
            "name": "Azimuth at projection centre",
            "value": 31,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8813
            }
        },
        {
            "name": "Angle from Rectified to Skew Grid",
            "value": 31,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8814
            }
        },
        {
            "name": "Scale factor at projection centre",
            "value": 1.000105,
            "unit": "unity",
            "id": {
                "authority": "EPSG",
                "code": 8815
            }
        },
        {
            "name": "Easting at projection centre",
            "value": 656167.979,
            "unit": {
                "type": "LinearUnit",
                "name": "foot",
                "conversion_factor": 0.3048
            },
            "id": {
                "authority": "EPSG",
                "code": 8816
            }
        },
        {
            "name": "Northing at projection centre",
            "value": 738188.9764,
            "unit": {
                "type": "LinearUnit",
                "name": "foot",
                "conversion_factor": 0.3048
            },
            "id": {
                "authority": "EPSG",
                "code": 8817
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 11351
    }
}

Definition: GeoServer

11351=PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",47.05],PARAMETER["longitude_of_center",-104.65],PARAMETER["azimuth",31],PARAMETER["rectified_grid_angle",31],PARAMETER["scale_factor",1.000105],PARAMETER["false_easting",199999.9999992],PARAMETER["false_northing",225000.00000672]

Definition: MapServer - MAPfile

PROJECTION
	"proj=omerc"
	"lat_0=47.05"
	"lonc=-104.65"
	"alpha=31"
	"gamma=31"
	"k=1.000105"
	"x_0=199999.9999992"
	"y_0=225000.00000672"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=omerc +lat_0=47.05 +lonc=-104.65 +alpha=31 +gamma=31 +k=1.000105 +x_0=199999.9999992 +y_0=225000.00000672">
	<Layer srs="+proj=omerc +lat_0=47.05 +lonc=-104.65 +alpha=31 +gamma=31 +k=1.000105 +x_0=199999.9999992 +y_0=225000.00000672">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11351, 'EPSG', 11351, '+proj=omerc +lat_0=47.05 +lonc=-104.65 +alpha=31 +gamma=31 +k=1.000105 +x_0=199999.9999992 +y_0=225000.00000672', 'PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",47.05],PARAMETER["longitude_of_center",-104.65],PARAMETER["azimuth",31],PARAMETER["rectified_grid_angle",31],PARAMETER["scale_factor",1.000105],PARAMETER["false_easting",199999.9999992],PARAMETER["false_northing",225000.00000672]');