EPSG:11349

Montana Flathead 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 11348. Working unit is International feet (note: not US Survey feet).

Method: Hotine Oblique Mercator (variant B)

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

Description: (0,)

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United States (USA) - Montana - Flathead.

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Definition: OGC Well Known Text

PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["latitude_of_center",48.4],
PARAMETER["longitude_of_center",-114.45],
PARAMETER["azimuth",320],
PARAMETER["rectified_grid_angle",-40],
PARAMETER["scale_factor",1.000142],
PARAMETER["false_easting",150000.00001464],
PARAMETER["false_northing",150000.00001464]

Definition: OGC Well Known Text 2 (2019)

CONVERSION["Montana Flathead 83 (international foot)",
    METHOD["Hotine Oblique Mercator (variant B)",
        ID["EPSG",9815]],
    PARAMETER["Latitude of projection centre",48.4,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8811]],
    PARAMETER["Longitude of projection centre",-114.45,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8812]],
    PARAMETER["Azimuth at projection centre",320,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8813]],
    PARAMETER["Angle from Rectified to Skew Grid",-40,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8814]],
    PARAMETER["Scale factor at projection centre",1.000142,
        SCALEUNIT["unity",1],
        ID["EPSG",8815]],
    PARAMETER["Easting at projection centre",492125.9843,
        LENGTHUNIT["foot",0.3048],
        ID["EPSG",8816]],
    PARAMETER["Northing at projection centre",492125.9843,
        LENGTHUNIT["foot",0.3048],
        ID["EPSG",8817]],
    ID["EPSG",11349]]

Definition: ESRI Well Known Text

PROJECTION["Rectified_Skew_Orthomorphic_Center"],
PARAMETER["False_Easting",150000.00001464],
PARAMETER["False_Northing",150000.00001464],
PARAMETER["Scale_Factor",1.000142],
PARAMETER["Azimuth",-40.0],
PARAMETER["Longitude_Of_Center",-114.45],
PARAMETER["Latitude_Of_Center",48.4],
PARAMETER["XY_Plane_Rotation",-40.0]

Definition: PROJ.4

+proj=omerc +lat_0=48.4 +lonc=-114.45 +alpha=320 +gamma=-40 +k=1.000142 +x_0=150000.00001464 +y_0=150000.00001464

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11349","+proj=omerc +lat_0=48.4 +lonc=-114.45 +alpha=320 +gamma=-40 +k=1.000142 +x_0=150000.00001464 +y_0=150000.00001464");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Conversion",
    "name": "Montana Flathead 83 (international foot)",
    "method": {
        "name": "Hotine Oblique Mercator (variant B)",
        "id": {
            "authority": "EPSG",
            "code": 9815
        }
    },
    "parameters": [
        {
            "name": "Latitude of projection centre",
            "value": 48.4,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8811
            }
        },
        {
            "name": "Longitude of projection centre",
            "value": -114.45,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8812
            }
        },
        {
            "name": "Azimuth at projection centre",
            "value": 320,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8813
            }
        },
        {
            "name": "Angle from Rectified to Skew Grid",
            "value": -40,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8814
            }
        },
        {
            "name": "Scale factor at projection centre",
            "value": 1.000142,
            "unit": "unity",
            "id": {
                "authority": "EPSG",
                "code": 8815
            }
        },
        {
            "name": "Easting at projection centre",
            "value": 492125.9843,
            "unit": {
                "type": "LinearUnit",
                "name": "foot",
                "conversion_factor": 0.3048
            },
            "id": {
                "authority": "EPSG",
                "code": 8816
            }
        },
        {
            "name": "Northing at projection centre",
            "value": 492125.9843,
            "unit": {
                "type": "LinearUnit",
                "name": "foot",
                "conversion_factor": 0.3048
            },
            "id": {
                "authority": "EPSG",
                "code": 8817
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 11349
    }
}

Definition: GeoServer

11349=PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",48.4],PARAMETER["longitude_of_center",-114.45],PARAMETER["azimuth",320],PARAMETER["rectified_grid_angle",-40],PARAMETER["scale_factor",1.000142],PARAMETER["false_easting",150000.00001464],PARAMETER["false_northing",150000.00001464]

Definition: MapServer - MAPfile

PROJECTION
	"proj=omerc"
	"lat_0=48.4"
	"lonc=-114.45"
	"alpha=320"
	"gamma=-40"
	"k=1.000142"
	"x_0=150000.00001464"
	"y_0=150000.00001464"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=omerc +lat_0=48.4 +lonc=-114.45 +alpha=320 +gamma=-40 +k=1.000142 +x_0=150000.00001464 +y_0=150000.00001464">
	<Layer srs="+proj=omerc +lat_0=48.4 +lonc=-114.45 +alpha=320 +gamma=-40 +k=1.000142 +x_0=150000.00001464 +y_0=150000.00001464">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11349, 'EPSG', 11349, '+proj=omerc +lat_0=48.4 +lonc=-114.45 +alpha=320 +gamma=-40 +k=1.000142 +x_0=150000.00001464 +y_0=150000.00001464', 'PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",48.4],PARAMETER["longitude_of_center",-114.45],PARAMETER["azimuth",320],PARAMETER["rectified_grid_angle",-40],PARAMETER["scale_factor",1.000142],PARAMETER["false_easting",150000.00001464],PARAMETER["false_northing",150000.00001464]');