Support different GPS solution providers

[falkamelung]

Currently MintPy supports only the UNR GPS solutions. It would be nice to have an option to select the GPS data source. For example, people from Scripps, MIT and JPL would like to use SOPAC, PBO and JPL GPS solutions, respectively. The way to do this would be to support the Unavco webservices where some of the GPS solution are available.

• GNSS Time Series from JPL: https://sideshow.jpl.nasa.gov/post/series.html
  • List of sites w/ position and velocity: https://sideshow.jpl.nasa.gov/post/tables/table2.html
  • Time series: https://sideshow.jpl.nasa.gov/pub/JPL_GPS_Timeseries/repro2018a/post/point/

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[yunjunz]

Hi @falkamelung, all GPS related features should have major changes in the coming version. I will keep this feature in mind and check the detailed implementation strategy when we started to actively work on it.

[falkamelung]

I got some feedback from Geoff Blewitt. There will be a reprocessing of all GPS data out by AGU with much better vertical (different handling of the troposphere). I asked about velocities for user-defined time periods. They will not do this. He suggests to use the MIDAS code and that it works well as long as you consider a little more than 1 year. He also points out that the MIDAS code is very simple and should be easy to translate to Python.

[yunjunz]

That's good to know, @falkamelung. Is there a publicly available implementation of MIDAS code for reference?

[ehavazli]

@yunjunz

ftp://gneiss.nbmg.unr.edu/MIDAS_release/

[yunjunz]

Thank you @ehavazli.