EPSG:8706

COMPD_CS["NAD83 / Montana (ft) + NAVD88 height (ft)",
    PROJCS["NAD83 / Montana (ft)",
        GEOGCS["NAD83",
            DATUM["North_American_Datum_1983",
                SPHEROID["GRS 1980",6378137,298.257222101,
                    AUTHORITY["EPSG","7019"]],
                AUTHORITY["EPSG","6269"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4269"]],
        PROJECTION["Lambert_Conformal_Conic_2SP"],
        PARAMETER["latitude_of_origin",44.25],
        PARAMETER["central_meridian",-109.5],
        PARAMETER["standard_parallel_1",49],
        PARAMETER["standard_parallel_2",45],
        PARAMETER["false_easting",1968503.937],
        PARAMETER["false_northing",0],
        UNIT["foot",0.3048,
            AUTHORITY["EPSG","9002"]],
        AXIS["Easting",EAST],
        AXIS["Northing",NORTH],
        AUTHORITY["EPSG","2256"]],
    VERT_CS["NAVD88 height (ft)",
        VERT_DATUM["North American Vertical Datum 1988",2005,
            AUTHORITY["EPSG","5103"]],
        UNIT["foot",0.3048,
            AUTHORITY["EPSG","9002"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","8228"]],
    AUTHORITY["EPSG","8706"]]

COMPOUNDCRS["NAD83 / Montana (ft) + NAVD88 height (ft)",
    PROJCRS["NAD83 / Montana (ft)",
        BASEGEOGCRS["NAD83",
            DATUM["North American Datum 1983",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4269]],
        CONVERSION["SPCS83 Montana zone (international foot)",
            METHOD["Lambert Conic Conformal (2SP)",
                ID["EPSG",9802]],
            PARAMETER["Latitude of false origin",44.25,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8821]],
            PARAMETER["Longitude of false origin",-109.5,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8822]],
            PARAMETER["Latitude of 1st standard parallel",49,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8823]],
            PARAMETER["Latitude of 2nd standard parallel",45,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8824]],
            PARAMETER["Easting at false origin",1968503.937,
                LENGTHUNIT["foot",0.3048],
                ID["EPSG",8826]],
            PARAMETER["Northing at false origin",0,
                LENGTHUNIT["foot",0.3048],
                ID["EPSG",8827]]],
        CS[Cartesian,2],
            AXIS["easting (X)",east,
                ORDER[1],
                LENGTHUNIT["foot",0.3048]],
            AXIS["northing (Y)",north,
                ORDER[2],
                LENGTHUNIT["foot",0.3048]]],
    VERTCRS["NAVD88 height (ft)",
        VDATUM["North American Vertical Datum 1988"],
        CS[vertical,1],
            AXIS["gravity-related height (H)",up,
                LENGTHUNIT["foot",0.3048]]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["United States (USA) - Montana - counties of Beaverhead; Big Horn; Blaine; Broadwater; Carbon; Carter; Cascade; Chouteau; Custer; Daniels; Dawson; Deer Lodge; Fallon; Fergus; Flathead; Gallatin; Garfield; Glacier; Golden Valley; Granite; Hill; Jefferson; Judith Basin; Lake; Lewis and Clark; Liberty; Lincoln; Madison; McCone; Meagher; Mineral; Missoula; Musselshell; Park; Petroleum; Phillips; Pondera; Powder River; Powell; Prairie; Ravalli; Richland; Roosevelt; Rosebud; Sanders; Sheridan; Silver Bow; Stillwater; Sweet Grass; Teton; Toole; Treasure; Valley; Wheatland; Wibaux; Yellowstone."],
        BBOX[44.35,-116.07,49.01,-104.04]],
    ID["EPSG",8706]]

PROJCS["NAD_1983_StatePlane_Montana_FIPS_2500_Feet_Intl",
    GEOGCS["GCS_North_American_1983",
        DATUM["D_North_American_1983",
            SPHEROID["GRS_1980",6378137.0,298.257222101]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Lambert_Conformal_Conic"],
    PARAMETER["False_Easting",1968503.937],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",-109.5],
    PARAMETER["Standard_Parallel_1",49.0],
    PARAMETER["Standard_Parallel_2",45.0],
    PARAMETER["Latitude_Of_Origin",44.25],
    UNIT["foot",0.3048]],
VERTCS["NAVD88_height_(ftIntl)",
    VDATUM["North_American_Vertical_Datum_1988"],
    PARAMETER["Vertical_Shift",0.0],
    PARAMETER["Direction",1.0],
    UNIT["foot",0.3048]]

proj4.defs("EPSG:8706","+proj=lcc +lat_0=44.25 +lon_0=-109.5 +lat_1=49 +lat_2=45 +x_0=599999.9999976 +y_0=0 +datum=NAD83 +units=ft +vunits=ft +no_defs +type=crs");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "CompoundCRS",
    "name": "NAD83 / Montana (ft) + NAVD88 height (ft)",
    "components": [
        {
            "type": "ProjectedCRS",
            "name": "NAD83 / Montana (ft)",
            "base_crs": {
                "type": "GeographicCRS",
                "name": "NAD83",
                "datum": {
                    "type": "GeodeticReferenceFrame",
                    "name": "North American Datum 1983",
                    "ellipsoid": {
                        "name": "GRS 1980",
                        "semi_major_axis": 6378137,
                        "inverse_flattening": 298.257222101
                    }
                },
                "coordinate_system": {
                    "subtype": "ellipsoidal",
                    "axis": [
                        {
                            "name": "Geodetic latitude",
                            "abbreviation": "Lat",
                            "direction": "north",
                            "unit": "degree"
                        },
                        {
                            "name": "Geodetic longitude",
                            "abbreviation": "Lon",
                            "direction": "east",
                            "unit": "degree"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 4269
                },
                "remarks": "Longitude is POSITIVE EAST. The adjustment included connections to Greenland and Mexico but the system was not adopted there. For applications with an accuracy of better than 1m replaced by NAD83(HARN) in the US and PRVI and by NAD83(CSRS) in Canada."
            },
            "conversion": {
                "name": "SPCS83 Montana zone (international foot)",
                "method": {
                    "name": "Lambert Conic Conformal (2SP)",
                    "id": {
                        "authority": "EPSG",
                        "code": 9802
                    }
                },
                "parameters": [
                    {
                        "name": "Latitude of false origin",
                        "value": 44.25,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8821
                        }
                    },
                    {
                        "name": "Longitude of false origin",
                        "value": -109.5,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8822
                        }
                    },
                    {
                        "name": "Latitude of 1st standard parallel",
                        "value": 49,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8823
                        }
                    },
                    {
                        "name": "Latitude of 2nd standard parallel",
                        "value": 45,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8824
                        }
                    },
                    {
                        "name": "Easting at false origin",
                        "value": 1968503.937,
                        "unit": {
                            "type": "LinearUnit",
                            "name": "foot",
                            "conversion_factor": 0.3048
                        },
                        "id": {
                            "authority": "EPSG",
                            "code": 8826
                        }
                    },
                    {
                        "name": "Northing at false origin",
                        "value": 0,
                        "unit": {
                            "type": "LinearUnit",
                            "name": "foot",
                            "conversion_factor": 0.3048
                        },
                        "id": {
                            "authority": "EPSG",
                            "code": 8827
                        }
                    }
                ]
            },
            "coordinate_system": {
                "subtype": "Cartesian",
                "axis": [
                    {
                        "name": "Easting",
                        "abbreviation": "X",
                        "direction": "east",
                        "unit": {
                            "type": "LinearUnit",
                            "name": "foot",
                            "conversion_factor": 0.3048
                        }
                    },
                    {
                        "name": "Northing",
                        "abbreviation": "Y",
                        "direction": "north",
                        "unit": {
                            "type": "LinearUnit",
                            "name": "foot",
                            "conversion_factor": 0.3048
                        }
                    }
                ]
            }
        },
        {
            "type": "VerticalCRS",
            "name": "NAVD88 height (ft)",
            "datum": {
                "type": "VerticalReferenceFrame",
                "name": "North American Vertical Datum 1988"
            },
            "coordinate_system": {
                "subtype": "vertical",
                "axis": [
                    {
                        "name": "Gravity-related height",
                        "abbreviation": "H",
                        "direction": "up",
                        "unit": {
                            "type": "LinearUnit",
                            "name": "foot",
                            "conversion_factor": 0.3048
                        }
                    }
                ]
            }
        }
    ],
    "scope": "Engineering survey, topographic mapping.",
    "area": "United States (USA) - Montana - counties of Beaverhead; Big Horn; Blaine; Broadwater; Carbon; Carter; Cascade; Chouteau; Custer; Daniels; Dawson; Deer Lodge; Fallon; Fergus; Flathead; Gallatin; Garfield; Glacier; Golden Valley; Granite; Hill; Jefferson; Judith Basin; Lake; Lewis and Clark; Liberty; Lincoln; Madison; McCone; Meagher; Mineral; Missoula; Musselshell; Park; Petroleum; Phillips; Pondera; Powder River; Powell; Prairie; Ravalli; Richland; Roosevelt; Rosebud; Sanders; Sheridan; Silver Bow; Stillwater; Sweet Grass; Teton; Toole; Treasure; Valley; Wheatland; Wibaux; Yellowstone.",
    "bbox": {
        "south_latitude": 44.35,
        "west_longitude": -116.07,
        "north_latitude": 49.01,
        "east_longitude": -104.04
    },
    "id": {
        "authority": "EPSG",
        "code": 8706
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=lcc +lat_0=44.25 +lon_0=-109.5 +lat_1=49 +lat_2=45 +x_0=599999.9999976 +y_0=0 +datum=NAD83 +units=ft +vunits=ft +no_defs +type=crs">
	<Layer srs="+proj=lcc +lat_0=44.25 +lon_0=-109.5 +lat_1=49 +lat_2=45 +x_0=599999.9999976 +y_0=0 +datum=NAD83 +units=ft +vunits=ft +no_defs +type=crs">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8706, 'EPSG', 8706, '+proj=lcc +lat_0=44.25 +lon_0=-109.5 +lat_1=49 +lat_2=45 +x_0=599999.9999976 +y_0=0 +datum=NAD83 +units=ft +vunits=ft +no_defs +type=crs', 'COMPD_CS["NAD83 / Montana (ft) + NAVD88 height (ft)",PROJCS["NAD83 / Montana (ft)",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["latitude_of_origin",44.25],PARAMETER["central_meridian",-109.5],PARAMETER["standard_parallel_1",49],PARAMETER["standard_parallel_2",45],PARAMETER["false_easting",1968503.937],PARAMETER["false_northing",0],UNIT["foot",0.3048,AUTHORITY["EPSG","9002"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2256"]],VERT_CS["NAVD88 height (ft)",VERT_DATUM["North American Vertical Datum 1988",2005,AUTHORITY["EPSG","5103"]],UNIT["foot",0.3048,AUTHORITY["EPSG","9002"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","8228"]],AUTHORITY["EPSG","8706"]]');