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Changelog

March 6, 2017 (HDGM-2017):
- Incorporated over 3 years of data from the Swarm satellite mission
- Main field and secular variation update valid until 2019.0
- Implemented Ionospheric DIFI-2 model within the HDGM-RT package

March 17, 2016 (HDGM-2016):
- Incorporated over 2 years of data from the Swarm satellite mission
- Main field and secular variation update valid until 2018.0
- Implemented HDGM-RT Real-Time Disturbance model as an optional addition to the standard HDGM package

March 17, 2015 (HDGM-2015):
- Incorporated over 1 year of data from the Swarm satellite mission
- Main field and secular variation update valid until 2017.0
- Retroactive updates of models for 2010-2014 using new Swarm data
- Extended main field model back to 1900, so now HDGM covers all time periods 1900-present
- Updated external disturbance field prediction for 2015

May 7, 2014 (HDGM-2014):
- Incorporated data from DMSP satellites for 2010-2014 models
- Main field and secular variation update valid until 2016.0
- Updated external disturbance field prediction for 2014