Solid Earth Tides Correction

[sofía viotto]

Hi Yunjun,

I have applied the Solid Earth Tides correction to my time series to test it. Then MintPy creates an inputs/SET.h5 file. When I have plotted that file it looks strange to me, so I suspect that this file is used for further calculation and then finally the contribution of the Solid Earth Tides is subtracted from my time series. So, I was wondering if you can explain me what kind of information is stored in the SET.h5 file.

Also, I would like to know your thoughts about the correction, for example what kind of analysis would require it. 

Thanks a lot!

Best regards,

Sofia 

[Zhang Yunjun]

Hi Sofia,

Both the "inputs/SET.h5" and "inputs/ERA5.h5" file stores the absolute range delay, for more generic purposes. For InSAR, we only see the double-differenced deformation. The double differencing is applied on the fly while running the correction steps (it shows up in the printout message in the terminal as well, if one pays attention to the long message .......). 

This absolute variation (in space and time) is important, for example, for geolocation purposes (a project that I am working on). For SET in InSAR analysis, it only matters for very large-scale analysis (> 200 km, e.g.), as you can see it in the README file of https://github.com/insarlab/pysolid.

This is discussed in a little bit more detail in a paper I am writing. It will be listed in the pysolid github repo once it came out, so stay tuned there if you are interested.

Regards,

Yunjun

[sofía viotto]

Thank Yunjun for your explanation and thoughts. I'll wait for you publication then

Best,

Sofia