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Name: DRUKREF 03 to DrukRef23 (1)
Method: NTv2
Grid Files: d03tod23.gsb
Remarks: Derived at 5753 points.
Information source: National Land Commission Secretariat of Bhutan (NLCS), MiraSpaco NTv2 Summary Report (Nov 2025); https://miranet.nlcs.gov.bt/public/ntv2/
Revision date: 2026-02-13
Unit: metre
Geodetic CRS: DRUKREF 03
Datum: Bhutan National Geodetic Datum
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Information source: Department of Survey and Land Records (DSLR), National Land Commission of Bhutan (NLC) via Lantmäteriet Sweden.
Revision date: 2010-10-26
Scope: Engineering survey, topographic mapping.
Area of use: Bhutan.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: m.
Definition: OGC Well Known Text 2 (2019)
BOUNDCRS[ SOURCECRS[ PROJCRS["DRUKREF 03 / Bhutan National Grid", BASEGEOGCRS["DRUKREF 03", DATUM["Bhutan National Geodetic Datum", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",5264]], CONVERSION["Bhutan National Grid", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",90, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",1, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",250000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Engineering survey, topographic mapping."], AREA["Bhutan."], BBOX[26.7,88.74,28.33,92.13]], ID["EPSG",5266]]], TARGETCRS[ GEOGCRS["DrukRef23", DATUM["National Reference Frame of Bhutan 2023", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Horizontal component of 3D system."], AREA["Bhutan."], BBOX[26.7,88.74,28.33,92.13]], ID["EPSG",11226], REMARK["Replaces DRUKREF 03 (CRS code 5264)."]]], ABRIDGEDTRANSFORMATION["DRUKREF 03 to DrukRef23 (1)", METHOD["NTv2", ID["EPSG",9615]], PARAMETERFILE["Latitude and longitude difference file","d03tod23.gsb"], USAGE[ SCOPE["Transformation of coordinates at 0.1m level of accuracy."], AREA["Bhutan."], BBOX[26.7,88.74,28.33,92.13]], ID["EPSG",11337], REMARK["Derived at 5753 points."]]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "type": "ProjectedCRS", "name": "DRUKREF 03 / Bhutan National Grid", "base_crs": { "type": "GeographicCRS", "name": "DRUKREF 03", "datum": { "type": "GeodeticReferenceFrame", "name": "Bhutan National Geodetic Datum", "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": 5264 }, "remarks": "Replaced by DrukRef23 (CRS code 11226)." }, "conversion": { "name": "Bhutan National Grid", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 0, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": 90, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 1, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 250000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 0, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "E", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "N", "direction": "north", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5266 } }, "target_crs": { "type": "GeographicCRS", "name": "DrukRef23", "datum": { "type": "GeodeticReferenceFrame", "name": "National Reference Frame of Bhutan 2023", "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": 11226 }, "remarks": "Replaces DRUKREF 03 (CRS code 5264)." }, "transformation": { "name": "DRUKREF 03 to DrukRef23 (1)", "method": { "name": "NTv2", "id": { "authority": "EPSG", "code": 9615 } }, "parameters": [ { "name": "Latitude and longitude difference file", "value": "d03tod23.gsb", "id": { "authority": "EPSG", "code": 8656 } } ], "id": { "authority": "EPSG", "code": 11337 } } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=tmerc +lat_0=0 +lon_0=90 +k=1 +x_0=250000 +y_0=0 +ellps=GRS80 +units=m +no_defs +type=crs"> <Layer srs="+proj=tmerc +lat_0=0 +lon_0=90 +k=1 +x_0=250000 +y_0=0 +ellps=GRS80 +units=m +no_defs +type=crs"> </Layer> </Map>
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