POSC Specifications
Version 3.0
Epicentre Standard Values
transformation_method

transformation_method

Standard Instance Values

Alias values exist. Go to the alias file.

identifier description naming _system reverse _transform _valid sign _reversal source _reference source _content source version status
    naming _system .identifier           ref _version .identifier  
Unknown The transformation method is unknown. EPSG preferred name False False   POSC POSC epicentre 3.0 current
concatenated The transformation is an ordered application of two or more known simple transformations. EPSG preferred name False False   POSC POSC epicentre 2.2.3 current
Transverse Mercator A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder whose central axis is in the plane of the equator. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.4 EPSG POSC epicentre 2.1 current
Lambert Conic Conformal (1SP) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cone whose central axis coincides with the polar axis. The method uses one standard parallel, and a scale factor at the origin. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.1 EPSG POSC epicentre 2.1 current
Lambert Conic Conformal (2SP) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cone whose central axis coincides with the polar axis. The method uses two standard parallels. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.1 EPSG POSC epicentre 2.1 current
Lambert Conic Conformal (2SP Belgium) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cone whose central axis coincides with the polar axis. The method has been modified by Helmert (similarity) transformation. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.1 EPSG POSC epicentre 2.2 current
Lambert Conic Near-Conformal A transformation between geographic and projected coordinate systems, which almost conformally maps an ellipsoid onto a cone whose central axis coincides with the polar axis. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.1 EPSG POSC epicentre 3.0 current
Mercator (1SP) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder whose central axis coincides with the polar axis. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.2 EPSG POSC epicentre 2.2 current
Mercator (2SP) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder whose central axis coincides with the polar axis. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.2 EPSG POSC epicentre 2.2 current
Laborde Oblique Mercator A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder whose central axis is in the plane oblique to the equator. EPSG preferred name True False La nouvelle projection du Service Geographique de Madagascar; J. Laborde; 1928 EPSG POSC epicentre 2.1 current
Hotine Oblique Mercator A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder in contact with the ellipsoid along a geodesic. EPSG preferred name True False Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.5 EPSG POSC epicentre 2.1 current
Transverse Mercator (South Oriented) A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a cylinder whose central axis is in the plane of the equator. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.4 EPSG POSC epicentre 2.1 current
Polar Stereographic A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a plane tangent to the ellipsoid at the pole. EPSG preferred name True False US Geological Survey Professional Paper 1395; Map Projections - A Working Manual; J. Snyder EPSG POSC epicentre 2.2 current
Oblique Stereographic A transformation between geographic and projected coordinate systems, which conformally maps an ellipsoid onto a plane tangent to the ellipsoid at some point on the ellipsoid. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.6 EPSG POSC epicentre 2.1 current
New Zealand Map Grid A transformation between geographic and projected coordinate systems developed for the New Zealand area. EPSG preferred name True False New Zealand Department of Lands technical circular 1973/32 EPSG POSC epicentre 2.1 current
Cassini-Soldner A transformation between geographic and projected coordinate systems, which is neither conformal nor equal area. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.3 EPSG POSC epicentre 2.1 current
Swiss Oblique Cylindrical A transformation between geographic and projected coordinate systems developed for the area of Switzerland. EPSG preferred name True False Die projecktionen der Schweizerischen Plan und Kartenwerke; J Bollinger; 1967 EPSG POSC epicentre 2.2 current
Tunisia Mining Grid A transformation between geographic and projected coordinate systems developed for Tunisia. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.8 EPSG POSC epicentre 2.2.2 current
Oblique Mercator A transformation between geographic and projected coordinate systems. This method subsumes the Laborde Oblique Mercator and the Swiss Oblique Cylindrical methods for an appropriate formulation. EPSG preferred name True False EPSG Guidance note #7; Geographic and Projected Coordinate System Transformations; section 1.4.5 EPSG POSC epicentre 2.2.1 current

transformation_method

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identifier description naming _system reverse _transform _valid sign _reversal source _reference source _content source version status
American Polyconic A transformation between geographic and projected coordinate systems EPSG preferred name True False US Geological Survey Professional Paper 1395; Map Projections - A Working Manual; J. Snyder EPSG POSC epicentre 3.0 current
Krovak Oblique Conic Conformal A conic conformal transformation in which the axis of the cone is not coincident with the polar axis (the semi-minor axis of the ellipsoid). This transformation is used in the Czech Republic and Slovakia. EPSG preferred name True False Research Institute for Geodesy Topography and Cartography (VUGTK); Prague. EPSG POSC epicentre 3.0 current
NADCON North American Datum Conversion. A grid that is produced by the DMA. Implementation is by software that performs a grid interpolation. EPSG preferred name False False US Coast and geodetic Survey - http://www.ngs.noaa.gov EPSG POSC epicentre 2.1 current
Longitude rotation A transformation on a 2d or 3d geographic coordinate system, which changes the longitude values by rotation value, and leaves the latitude and/or elevation unchanged. Lon2 = Lon1 + longitude_rotation. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Geographical and Height Offsets This transformation allows calculation of coordinates in the target system by adding the parameter value to the coordinate values of the point in the source system. The parameter value is added to the value in the source system to give the value in the target system. Lat2 = Lat1 + latitude_offset; Lon2 = Lon1 + longitude_offset; EllipsoidHeight2 = GravityHeight1 + gravity-related to ellipsoid height. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Geographical Offsets This transformation allows calculation of coordinates in the target system by adding the parameter value to the coordinate values of the point in the source system. The parameter value is added to the value in the source system to give the value in the target system. Lat2 = Lat1 + latitude_offset; Lon2 = Lon1 + longitude_offset. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Geographic/geocentric conversions A point in a geodetic (lat, long, elevation) coordinate system is converted to a geocentric (x, y, z), or the reverse. EPSG preferred name False False   EPSG POSC epicentre 3.0 current
Geocentric translations A transformation on a 3d geocentric coordinate system that translates the x, y, z values by parameter values. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Molodenski A transformation between Geographic Coordinate Systems EPSG preferred name True True   EPSG POSC epicentre 2.2 current
Abridged Molodenski A transformation between Geographic Coordinate Systems EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Position Vector 7-param. transformation A 3-dimensional affine transformation between geocentric coordinate systems. The rotations view the difference between the point in the new coordinate system vs. the same point in the old system. See also coordinate frame rotation. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
NTv1 Geodetic transformation operating on geographic coordinate differences by bi-linear interpolation. Used specifically for some NAD27 -- NAD83 transformations in Canada. EPSG preferred name False False Geomatics Canada - Geodetic Survey Division. EPSG POSC epicentre 3.0 current
NTv2 Geodetic transformation operating on geographic coordinate differences by bi-linear interpolation. EPSG preferred name False False http://www.geod.nrcan.gc.ca/products/html-public/GSDapps/English/NTv2_Fact_Sheet.html EPSG POSC epicentre 3.0 current
Norway Offshore Interpolation Geodetic transformation specifically for offshore Norway. EPSG preferred name False False Norwegian Mapping Authority note of 13-Feb-1991 Om Transformasjon mellom Geodetiske Datum i Norge. EPSG POSC epicentre 3.0 current
Madrid to ED50 The original geographic coordinate system for the Spanish mainland was based on Madrid 1870 datum, Struve 1860 ellipsoid, with longitudes related to the Madrid meridian. Three polynomial expressions have been empirically derived by to convert geographical coordinates based on this system to equivalent values based on the European Datum of 1950 (ED50). The polynomial coefficients derived can be used to convert from Madrid 1870 to ED50. Three pairs of expressions have been derived: each pair is used to calculate the shift in latitude and longitude respectively for (i) a mean for all Spain, (ii) a better fit for the north of Spain, (iii) a better fit for the south of Spain. The polynomial expressions transformations are: dLat seconds = A1 + (along*lon) + (alat*lat) + (ah*h); dLon seconds = (b0+b1) + (blong*lon) + (blat*lat) + (bh*h) where latitude lat and longitude lon are in decimal degrees referred to the Madrid 1870 (Madrid) geographic coordinate system and h in metres. b0 is the longitude (in seconds) of the Madrid meridian measured from the Greenwich meridian; it is the value to be applied to a longitude relative to the Madrid meridian to transform it to a longitude relative to the Greenwich meridan. The results of these expressions are applied through the formulas: Lat(ED50) = Lat(M1870(M)) + dLat; and Lon(ED50) = Lon(M1870(M)) + dLon. EPSG preferred name False False El Servicio Geografico del Ejercito EPSG POSC epicentre 3.0 current
Coordinate Frame rotation A 3-dimensional affine transformation between geocentric coordinate systems. The rotations view the axes in the new coordinate system with respect to the old coordinate system. See also position vector transformation. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Vertical Offset This transformation allows calculation of ordinate in the target system by adding the parameter value to the ordinate value of the point in the source system. V2 = [(V1 * U1) + (O12 * Uoff)] * (m / U2) where V2 = value in second vertical coordinate system; V1 = value in first system; O12 is the value of the origin of system 2 in system 1; m is unit direction multiplier (m=1 if both systems are height or both are depth; m=-1 if one system is height and the other system is depth; the value of m is implied through the vertical coordinate system type attribute); U1 U2 and Uoff are unit conversion ratios to metres for systems 1 2 and the offset value respectively. EPSG preferred name True True   EPSG POSC epicentre 2.2.1 current
2-dimensional affine transformation A 2-dimensional affine transformation between rectangular coordinate systems. P2 = A + B P1. A is a two dimensional vector, and B is a 2 by 2 matrix. POSC basic False False   POSC POSC epicentre 3.0 current
Similarity transformation A 2-dimensional affine transformation for which B has only two independent values. Namely, a12 = -a21, and a11 = a22, and for which all unit vectors are transformed into unit vectors.. POSC basic False False   POSC POSC epicentre 3.0 current
Affine orthogonal geometric transformation A 2-dimensional affine transformation for which B has only two independent values. Namely, a12 = -a21, and a11 = a22. Unit vectors are scaled by a factor of k. POSC basic False False   POSC POSC epicentre 3.0 current

transformation_method

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identifier description naming _system reverse _transform _valid sign _reversal source _reference source _content source version status
Affine general geometric transformation A 2-dimensional affine transformation for which may rotate the two axes by different angles, and which may scale the axes by a given factor. POSC basic False False   POSC POSC epicentre 3.0 current
Affine general parametric transformation A 2-dimensional affine transformation for which for which the actual matrix coefficients are given. Xnew = A0 + A1 Xold + A2 Yold; Ynew = B0 + B1 Xold + B2 Yold. POSC basic False False   POSC POSC epicentre 3.0 current
high order fit Standard software that uses a high order fit to convert between datums. POSC basic False False   POSC POSC epicentre 2.1 current
3D affine A general affine transformation between 3-dimensional coordinate systems. P2 = A + B P1 POSC basic True False   POSC POSC epicentre 2.1 current
2D linear A linear transformation from one 2-dimensional coordinate system to another. P2 = B P1 POSC basic True False   POSC POSC epicentre 2.1 current
3D linear A linear transformation from one 3-dimensional coordinate system to another. P2 = B P1 EPSG preferred name True False   POSC POSC epicentre 2.1 current
2D orthogonal An orthogonal transformation from one 2-dimensional coordinate system to another. P2 = B P1 where B B(transpose) is an identity matrix. POSC basic True False   POSC POSC epicentre 2.1 current
3D orthogonal An orthogonal transformation from one 3-dimensional coordinate system to another.. P2 = B P1 where B B(transpose) is an identity matrix. POSC basic True False   POSC POSC epicentre 2.1 current
identity13 An identity-type transformation from a 1-dimensional coordinate system to a 3-dimensional coordinate system. POSC basic False False   POSC POSC epicentre 2.1 current
identity23 An identity-type transformation from a 2-dimensional coordinate system to a 3-dimensional coordinate system. POSC basic False False   POSC POSC epicentre 2.1 current
identity31 An identity-type transformation from a 3-dimensional coordinate system to a 1-dimensional coordinate system. (A projection) POSC basic False False   POSC POSC epicentre 2.1 current
identity32 An identity-type transformation from a 3-dimensional coordinate system to a 2-dimensional coordinate system. (A projection) POSC basic False False   POSC POSC epicentre 2.1 current
1D affine ax + b. b represents the shift, and a represents the expansion. negative a means a reversal of direction. This is a two way transformation, where the inverse is defined by b --> -b/a, and a --> 1./a. POSC basic True False   POSC POSC epicentre 2.1 current
Reversible polynomial (2nd-order) Definition of 2nd order polynomial function mapping from R2 -> R2, which may be defined by 12 parameters. The method is defined so that the polynomial is reversible, but requires preconditioning of the coordinate values. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
General polynomial (2nd-order) Definition of 2nd order polynomial function mapping from R2 -> R2, which may be defined by 12 parameters. EPSG preferred name False False   EPSG POSC epicentre 3.0 current
Reversible polynomial (3rd-order) Definition of 3rd order polynomial function mapping from R2 -> R2, which may be defined by 20 parameters. The method is defined so that the polynomial is reversible, but requires preconditioning of the coordinate values. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Complex polynomial (3rd-order) Definition of 3rd order polynomial function mapping from C1 -> C1, which may be defined by 6 parameters. The transformation is expressed in terms of complex numbers. EPSG preferred name False False   EPSG POSC epicentre 3.0 current
General polynomial (3rd-order) Definition of 3rd order polynomial function mapping from R2 -> R2, which may be defined by 24 parameters. EPSG preferred name False False   EPSG POSC epicentre 3.0 current
Reversible polynomial (4th-order) Definition of 4th order polynomial function mapping from R2 -> R2, which may be defined by 30 parameters. The method is defined so that the polynomial is reversible, but requires preconditioning of the coordinate values. EPSG preferred name True True   EPSG POSC epicentre 3.0 current
Complex polynomial (4th-order) Definition of 4th order polynomial function mapping from C1 -> C1, which may be defined by 8 parameters. The transformation is expressed in terms of complex numbers. EPSG preferred name False False   EPSG POSC epicentre 3.0 current

transformation_method

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identifier description naming _system reverse _transform _valid sign _reversal source _reference source _content source version status
General polynomial (4th-order) Definition of 4th order polynomial function mapping from R2 -> R2, which may be defined by 34 parameters. EPSG preferred name False False   EPSG POSC epicentre 3.0 current
polar A transformation between a rectangular and a polar coordinate system. It is explicitly a mapping from R2 to R2. There are no parameters. POSC basic True True   POSC POSC epicentre 2.2.2 current
cylindrical A transformation between a rectangular and a cylindrical coordinate system. It is explicitly a mapping from R3 to R3. There are no parameters. POSC basic True True   POSC POSC epicentre 2.2.2 current
spherical A transformation between a rectangular and a cylindrical coordinate system. It is explicitly a mapping from R3 to R3. There are no parameters. POSC basic True True   POSC POSC epicentre 2.2.2 current
Lambert Conic Conformal (Helmert) Deprecated. Changed to Lambert Conic Conformal (2SP Belgium). EPSG preferred name True False   EPSG POSC epicentre 2.2 deprecated
Mercator Deprecated. Use Mercator (1SP) or Mercator (2SP). EPSG preferred name True False   EPSG POSC epicentre 2.2 deprecated
Swiss Oblique Mercator Deprecated. Use Swiss Oblique Cylindrical. EPSG preferred name True False   EPSG POSC epicentre 2.2 deprecated
longitude rotation Deprecated. Use Longitude rotation. The only difference is the uppercase L. EPSG preferred name True True   EPSG POSC epicentre 3.0 deprecated
geodetic/geocentric conversion Deprecated. Use Geodetic/geocentric conversions. The difference is in the upper case and spelling. EPSG preferred name False False   EPSG POSC epicentre 3.0 deprecated
geocentric translation Deprecated. Use Geocentric translations. The difference is in the upper case and spelling. EPSG preferred name True True   EPSG POSC epicentre 3.0 deprecated
Molodensky Deprecated. A change in the spelling. EPSG preferred name True True   EPSG POSC epicentre 2.2 deprecated
abridged Molodenski Deprecated. Use Abridged Molodenski. The difference is the upper case A. EPSG preferred name True True   EPSG POSC epicentre 3.0 deprecated
position vector transformation Deprecated. Use Position Vector 7-param. transformation. EPSG preferred name True True   EPSG POSC epicentre 3.0 deprecated
Bursa-Wolf Deprecated. Renamed to position vector transformation. EPSG preferred name True True   EPSG POSC epicentre 2.2 deprecated
coordinate frame rotation Deprecated. Use Coordinate Frame rotation. EPSG preferred name True True   EPSG POSC epicentre 3.0 deprecated
2D affine Deprecated. Use 2-dimensional affine transformation. EPSG preferred name False False   EPSG POSC epicentre 3.0 deprecated

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