Version 
Date 
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Amendments 
46 
June 2013 
Added Lambert Conic Conformal 2SP (Michigan), Colombia Urban and timedependent Helmert 7parameter transformation methods and Affine Parametric Transformation example. Amended Tunisia Mining Grid description. 

45 
July 2012 

Added lefthanded bin grid method. 
44 
April 2012 

Added missing equations for reverse case of American Polyconic. Amended 
43 
July 2011 

Corrected formula for ξ_{O} in Transverse Mercator. Corrected coefficient B1 and longitude example in Polynomial transformation for Spain. 
42 
November 2010 

Corrected formula for t in Mercator variant C reverse case. Changed name of Krovak defining parameter. 
41 
October 2010 

Augmented Transverse Mercator for wide area. Amended TM(SO) example. Amended Mercator and Oblique Mercator variant names, added Mercator variant C method. corrected Oblique Mercator (Hotine variant B) formulae for azimuth = 90º case. Added Krovak variants. Corrected Polar Stereographic equations for calculation of longitude. Augmented reverse case for Similarity Transformation. References to OGP publication 430 (GIGS test data) added. 
40 
November 2009 

For geographic/geocentric conversions, corrected equation for j. For Tranverse Mercator (South Oriented), added example. Corrected equation for computation of radius of authalic sphere (optionally referenced by equal area methods developed on a sphere). Augmented description of geocentric methods to clearly discriminate the coordinate domain to which they are applied. 
39 
April 2009 
Preface revised to be consistent with other parts of GN7. For Lambert Azimuth Equal Area, in example corrected symbol for β'. For Krovak, corrected formulas. For Equidistant Cylidrical (spherical) corrected formula for R; comments on R added to all sperical methods. For Equidistant Cylindrical updated formula to harmoise parameters and symbols with similar methods. 

38 
January 2009 

For Mercator (1SP), clarified use of φ_{O}. For MolodenskyBadekas, augmented example.Added Popular Visualisation Pseudo Mercator method, added formulas and examples for Mercator (Spherical) and formulas for American Polyconic 
37 
August 2008 

Corrected general polynomial example 
36 
July 2008 

For Lambert Conic Near Conformal, corrected equations for φ_{O}. 
35 
April 2008 

Longitude wraparound note clarified. For Oblique Mercator, corrected symbol in formula for longitude. For Krovak, clarified defining parameters. Amended Vertical Offset description and formula. Added geographic/topocentric conversions, geocentric/topocentric conversions, Vertical Perspective, Orthographic, Lambert Cylindrical Equal Area, ellipsoidal development of Equidistant Cylindrical. Removed section on identification of map projection method. 
34 
July 2007 

Note on longitude wraparound added prior to preample to map projection formulas, section 1.4. For Laborde, corrected formula for q'. For Albers Equal Area, corrected formulae for α and β'. 
33 
March 2007 
For Krovak example, corrected axis names. 

32 
February 2007 
Descriptive text for Oblique Mercator amended; formula for Laborde projection for Madagascar added. Added polar aspect equations for Lambert Azimuthal Equal Area. Corrected example in polynomial transformation for Spain. For Lambert 1SP, corrected equation for r'. 

31 
August 2006 

Corrected sign of value for G in Modified Azimuthal Equidistant example. 
30 
August 2006 
Added Hyperbolic CassiniSoldner. Corrected FE and FN values in example for Modified Azimuthal Equidistant. Added note to Krovak. Amended Abridged Molodensky description, corrected example. 

29 
April 2006 

Typographic errors corrected. (For oblique stereographic, corrected formula for w. For Lambert azimuthal equal area, changed example. For Albers equal area, corrected formulae for alpha. For modified azimuthal equidistant, corrected formula for c. For Krovak, corrected formula for theta', clarified formulae for tO and lat. For Cassini, in example corrected radian value of longitude of natural origin). References to EPSG updated. 
28 
November 2005 

Corrected error in formula for t and false grid coordinates of 2SP example in Mercator projection 
27 
September 2005 
Miscellaneous linear coordinate operations paragraphs rewritten to include reversibility and UKOOA P6. Improved formula for r' in Lambert Conic NearConformal. 

26 
August 2005 

Further correction to Lambert Azimuthal Equal Area formulae. Correction to MoldenskiBadekas example. 
25 
May 2005 
Amended reverse formulas for Lambert Conic NearConformal. Corrected Lambert Azimuthal Equal Area formulae. Symbol for l atitude of pseudo standard parallel parameter made consistent. Corrected Affine Orthogonal Geometric transformation reverse example. Added Modified Azimuthal Equidistant projection. 

24 
October 2004 
From this revision, published as part 2 of a twopart set. Corrected equation for u in Oblique Mercsator. Added Guam projection, Geographic 3D to 2D conversion, vertical offset and gradient method, geoid models, bilinear interpolation methods. Added tables giving projection parameter definitions. Amended MolodenskyBadekas method name and added example. Added section on reversibility to Helmert 7parameter transformations. Transformation section 2 reordered. Section 3 (concatenated operations) added. Problem in reverse formulas for Lambert Conic NearConformal to be resolved. 

23 
January 2004 
Database codes for Polar Stereographic variants corrected. Degree representation conversions withdrawn. 

22 
December 2003 
Errors in FE and FN values in example for Lambert Azimuthal Equal Area corrected. 

21 
October 2003 
Typographic errors in example for Lambert Conic (Belgium) corrected. Polar Stereographic formulae extended for secant variants. General polynomial extended to degree 13. Added Abridged Molodensky and Lambert Azimuthal Equal Area examples and Reversible polynomial formulae. 

20 
May 2003 
Font for Greek symbols in Albers section amended. 

19 
December 2002 
Polynomial formulas amended. Formula for spherical radius in Equidistant Cylindrical projection amended. Formula for Krovak projection amended. Degree representation conversions added. Editorial amendments made to subscripts and superscripts. 

18 
August 2002 
Revised to include ISO 19111 terminology. Section numbering revised. Added Preface. Lambert Conformal (West Orientated), Lambert Azimuthal Equal Area, Albers, Equidistant Cylindrical (Plate Carrée), TM zoned, Bonne, MolodenskyBadedas methods added. Errors in Transverse Mercator (South Orientated) formula corrected. 

17 
June 2001 
Lambert Conformal, Mercator and Helmert formulas corrected. 

16 
December 2000 
Lambert Conformal (Belgium) remarks revised; Oblique Mercator methods consolidated and formulas added. Similarity Transformation reversibility remarks amended. 

15 
June 2000 
General Polynomial and Affine methods added 

14 
December 1999 
Stereographic and Tunisia Mining Grid formulas corrected. Krovacmethod added. 

13 
July 1999 
Lambert ConicNear Conformal and American Polyconic methods added 

12 
February 1999 
Abridged Molodensky formulas corrected 

11 
November 1998 
Polynomial for Spain and Tunisia Mining Grid methods added 

10 
May 1998 
Additionally issued as an EPSG guidance note 

1 
December 1993 
First release  POSC Epicentre 