Non-backward compatible changes:
− Update on new file-naming convention for plotting with stamps
− MERRA model downloads and uses netcdf 4 instead of hdf5 product

Other changes:
− Include support for GACOS products in aps_weather_model*.m programs
− Add GACOS information to manual
− Fix for downloading MERRA and MERRA2 models
− Add information on username and password for MERRA/MERRA2 downloads
− Add chunking approach for aps_weather_model_SAR.m, to avoid large memory issues
− Allow gmt function to be preceded with GMT or gmt executable.
− Staggering to ECMWF ERA-I download.
− Add support for .xml and .rsc DEM files
− Update manual for DEM and add statement that inc_angle is preferred above look_angle.

Non-backward compatible changes:
− aps_erra.m, aps_era_sar.m and aps_era_insar are discontinued and integrated in aps_weather_model.m module.
− Redefine hydrostatic delay based on surface pressure for aps_wrf and aps_weather_model functions.

New and other changes:
− Including powerlaw-band comparison with a reference technique (MERIS, ERA-I, WRF, unwrapped phase).
− Include the option to re-calibrate the MODIS PWV wrt MERIS PWV.
− Add chapter on PWV recalibration in manual.
− Include powerlaw ridge approach
− Include powerlaw and linear method support for varying interferogram pixel selection
− Isolate DEM loading module.
− Auto-format recognition for DEM, adapted from Hua Wang contribution
− Include “.grd” file support for DEM
− Matlab multi-core support included for WRF and weather models.
− Plotting of sounding sensitivity for spectrometer and powerlaw method.
− Add more tip and tricks based on issues on TRAIN forum
− Integrate all weather model approaches together into modular approach
− Include MERRA/MERRA2 weather model with automatic download & integration into the weather model routine
− Automated error catching.
− Attempt to autocorrect issues for GMT usage of MAC and Linux users
− Update manual on weather model correction routine
− Incorporate function which patches no-date pixels for weather models.