swath mode

[yunjunz]

I agree with you, that's the timing difference along the orbit! If it's not accounted for, this timing variation will introduce a small ramp along the azimuth direction for a long track (I described this in section III.E.2 in my 2022 TGRS paper, after Dr. Dennis Milber brought it up in our email communications); and for the multiple frames stitching, as in your case here, it looks like a jump in our current implementation!

I intended to write a swath mode, in addition to the current grid and point mode, for this scenario. The implementation will be much easier if we have a true API-like talking between the python and fortran code (#2), instead of the current talking via text file. Therefore, I have not done it yet.

Originally posted by @yunjunz in #54 (comment)

Since solid.for could return numpy array since #56, we could implement this feature.