NOAA Logo, NOAA Satellites and Information, National Geophysical Data Center (NGDC).

Go to the NGA Web Go to the WMM Web Home Go to the Geomagnetic Data Home Go to the WMM Web Home Go to Background on Geomagnetism Go to WMM accuracy and limitations Go to download WMM software and test values Go to WMM maps of the magnetic field elements Go to Copyright and license information
World Magnetic Model (WMM) Banner
 NOAA | NGA | NGDC | Geomagnetic Data & Info | WMM Home comments |  privacy policy

Home

Background

Brief description of geomagnetism and observation systems

About WMM

Learn more about model derivation, uncertainties and magnetic poles

Model & Software

Download model coefficients, software and documentation

Online Calculators

Calculate magnetic field values at or near the Earth surface

Maps

Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM

License

License and copyright information

Changes made to the WMM Code

As changes are made to the WMM code, the revised code will be posted. Check this site for change notices.The download code will always be the latest version


Date

Product

Short description of changes

Dec 15, 2015
Updated the Geomagnetism Library and software to handle new WMM2015 Error Model. Now distributed with the new WMM2015. Several bug fixes and performance improvements.

Dec 15, 2015
Updated for the new WMM2015 error model. Now distributed with the new WMM2015. Includes self-testing option. Several bug fixes and performance improvements.

Dec 2, 2013
Updates to Mesh implementation of EMM:
-Corrected a bug that caused the executable to fail on some windows machines
-No longer distributing .msh files and program no longer attepts to convert them from binary
-No longer distributing "EGM9615.BIN" file instead information is included in .exe files, in line with our other programs

Apr 20, 2012
The EMM has been extended backward to 2000 using the POMME model.

Apr 20, 2012
Major overhaul of the WMM Sublibrary, which is now called the Geomagnetism Library. It has been reorganized into 5 categories:
-User Interface
-Memory and File Processing
-Conversions, Transformations, and other Calculation
-Spherical Harmonics
-Geoid
The documentation has been updated. Two new functions were added: MAG_YearToDate and MAG_SphericalToCartesian. Several minor pointer related bugs were fixed as well.

Dec 20, 2011
Removed upper limit on altitude. The lower limit was left unchaged at -10 km.

Nov 22, 2011
Removed the Geoid file, "EGM9615.BIN", from the package and added the Geoid data as a header file so it is now a part of the executable. Minor bug fixes and stability improvements were also made.

Jun 16, 2011
Changes in WMM. Fixed minor bugs which threw warnings when WMM was compiled. Fixed memory leak related errors.

Sep 24, 2010
Changes in WMM_SubLibrary.c. Fixed two bugs in WMM_readMagneticModel_Large.

Sep 9, 2010
Changes in WMM_SubLibrary.c 1) Fixed problems due to unclosed files pointers 2) Fixed problems while using "print to file" option in grid programs. Updated WMM header files.

Feb 22, 2010
Users can now enter the height as above MSL or WGS84 Ellipsoid

Feb 4, 2010
GUI now uses the new WMM subroutines. More information on the updates is available in the software package.

Dec 15, 2009
GUI updated with the new WMM2010 coefficients.

July 27, 2007
WMM GUI is released

Feb 4, 2010
Version 1.0 is released. Extensive revision of the sublibrary, point, grid and file processing programs. More information on the updates is available in the software package.

Dec 15, 2009
Version 0.3 is released. Software is updated with WMM2010 coefficients.

Nov 17, 2009
Beta version is released.

Feb 4, 2010
Version 3 is released. This is the last update for this software. Floating point precision changed from single to double. More information on the updates is available in the software package.

Nov 5, 2005
Version 2 is released. Changes include: Spelling corrections in help text and input prompts, Warnings added for undefined declination at / near magnetic poles, Resolution of results consistent across all programs and Corrected elevation bug in the Fortran grid program

Apr 5, 2005
C Software bug fixes: 1) Fixed inclination reporting (erroniously reported as positive upwards) 2) Fixed problem reading input which led to a memory leak and program fail when compiled with gnu compilers

Dec 15, 2004
Changes: As of 2000, the model produced and distributed from the Web has been named "wmm.cof", with the model epoch contained in the header of the model. The current model has an additional change to be compliant with Y2K. The publication date of the model, as shown in the first line (header) of the model is now a four-digit year. There are no changes in the format of the coefficients.

Last Modified on: Sunday, 14-Dec-2014 15:18:37 MST
NOAA > NESDIS > NGDC
http://www.ngdc.noaa.gov/geomag/WMM/WMMChangesToTheCode.shtml
Maintained by: geomag.models@noaa.gov