EPSG:11356

Montana NECI 83 (meter)

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: See code 11357 for equivalent non-metric definition.

Method: Hotine Oblique Mercator (variant B)

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

Description: (0,)

Covered area powered by MapTiler MapTiler logo
SimpleMap
United States (USA) - Montana - NECI.

MapTiler banner

Definition: OGC Well Known Text

PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["latitude_of_center",48.25],
PARAMETER["longitude_of_center",-112],
PARAMETER["azimuth",39],
PARAMETER["rectified_grid_angle",39],
PARAMETER["scale_factor",0.999985],
PARAMETER["false_easting",50000],
PARAMETER["false_northing",100000]

Definition: OGC Well Known Text 2 (2019)

CONVERSION["Montana NECI 83 (meter)",
    METHOD["Hotine Oblique Mercator (variant B)",
        ID["EPSG",9815]],
    PARAMETER["Latitude of projection centre",48.25,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8811]],
    PARAMETER["Longitude of projection centre",-112,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8812]],
    PARAMETER["Azimuth at projection centre",39,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8813]],
    PARAMETER["Angle from Rectified to Skew Grid",39,
        ANGLEUNIT["degree",0.0174532925199433],
        ID["EPSG",8814]],
    PARAMETER["Scale factor at projection centre",0.999985,
        SCALEUNIT["unity",1],
        ID["EPSG",8815]],
    PARAMETER["Easting at projection centre",50000,
        LENGTHUNIT["metre",1],
        ID["EPSG",8816]],
    PARAMETER["Northing at projection centre",100000,
        LENGTHUNIT["metre",1],
        ID["EPSG",8817]],
    ID["EPSG",11356]]

Definition: ESRI Well Known Text

PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
PARAMETER["False_Easting",50000.0],
PARAMETER["False_Northing",100000.0],
PARAMETER["Scale_Factor",0.999985],
PARAMETER["Azimuth",39.0],
PARAMETER["Longitude_Of_Center",-112.0],
PARAMETER["Latitude_Of_Center",48.25]

Definition: PROJ.4

+proj=omerc +lat_0=48.25 +lonc=-112 +alpha=39 +gamma=39 +k=0.999985 +x_0=50000 +y_0=100000

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11356","+proj=omerc +lat_0=48.25 +lonc=-112 +alpha=39 +gamma=39 +k=0.999985 +x_0=50000 +y_0=100000");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Conversion",
    "name": "Montana NECI 83 (meter)",
    "method": {
        "name": "Hotine Oblique Mercator (variant B)",
        "id": {
            "authority": "EPSG",
            "code": 9815
        }
    },
    "parameters": [
        {
            "name": "Latitude of projection centre",
            "value": 48.25,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8811
            }
        },
        {
            "name": "Longitude of projection centre",
            "value": -112,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8812
            }
        },
        {
            "name": "Azimuth at projection centre",
            "value": 39,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8813
            }
        },
        {
            "name": "Angle from Rectified to Skew Grid",
            "value": 39,
            "unit": "degree",
            "id": {
                "authority": "EPSG",
                "code": 8814
            }
        },
        {
            "name": "Scale factor at projection centre",
            "value": 0.999985,
            "unit": "unity",
            "id": {
                "authority": "EPSG",
                "code": 8815
            }
        },
        {
            "name": "Easting at projection centre",
            "value": 50000,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8816
            }
        },
        {
            "name": "Northing at projection centre",
            "value": 100000,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8817
            }
        }
    ],
    "id": {
        "authority": "EPSG",
        "code": 11356
    }
}

Definition: GeoServer

11356=PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",48.25],PARAMETER["longitude_of_center",-112],PARAMETER["azimuth",39],PARAMETER["rectified_grid_angle",39],PARAMETER["scale_factor",0.999985],PARAMETER["false_easting",50000],PARAMETER["false_northing",100000]

Definition: MapServer - MAPfile

PROJECTION
	"proj=omerc"
	"lat_0=48.25"
	"lonc=-112"
	"alpha=39"
	"gamma=39"
	"k=0.999985"
	"x_0=50000"
	"y_0=100000"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=omerc +lat_0=48.25 +lonc=-112 +alpha=39 +gamma=39 +k=0.999985 +x_0=50000 +y_0=100000">
	<Layer srs="+proj=omerc +lat_0=48.25 +lonc=-112 +alpha=39 +gamma=39 +k=0.999985 +x_0=50000 +y_0=100000">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11356, 'EPSG', 11356, '+proj=omerc +lat_0=48.25 +lonc=-112 +alpha=39 +gamma=39 +k=0.999985 +x_0=50000 +y_0=100000', 'PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",48.25],PARAMETER["longitude_of_center",-112],PARAMETER["azimuth",39],PARAMETER["rectified_grid_angle",39],PARAMETER["scale_factor",0.999985],PARAMETER["false_easting",50000],PARAMETER["false_northing",100000]');