ifg info meaning

[maulanaheno]

ifg dates bperp dt unw_cov coh_av

20180102_20180108 -75.6 6 0.993 0.258
20180102_20180114 -46.0 12 0.975 0.223

what is this bbrep, dt, unw_cov, coh_av mean?

[yumorishita]

Perpendicular baseline, time interval (day), percentage of unwrapped pixel coverage, average coherence.

[githubrahmatcoba]

i try to process a deformation and have the result like in the picture, its like raster of the result been sliced, and i look at the ifg info its because of it has low unw_coh. do you know whats make it have low unw_cov?

[yumorishita]

It is because of the LiCSAR system. Please contact COMET.

[maulanaheno]

It is because of the LiCSAR system. Please contact COMET.

could you tell me the step of how to add our own pair of interferograms to be process using licsbas?

[yumorishita]

You should follow the file structure of GEOC (see here) or GEOCml (see here).

[as1234554321]

Hi sir @yumorishita
sorry I asked basic questions again

1. Why is the ref area point for each processing different even though the data and commands used are the same? Does this influence the determination of vertical deformation?
2. How to get a time series and land subsidence at several different location points?
3. If the processing is done with gacos and mask correction, does it have to be compared with GNSS data?

[yumorishita]

1. It should not happen if the data and commands are the same.
2. Do you mean exporting a text file? LiCSBAS_cum2tstxt.py can do it.
3. No.

[as1234554321]

thankyou sir,
ascending and descending produce different reference points.

• does it affect the results of vertical deformation?
• should both orbits have the same reference point for decomposition processing?

[yumorishita]

Yes for both.

[as1234554321]

thank you sir
how to set the same reference point on each orbit?

[yumorishita]

#244 (comment)

[maulanaheno]

Perpendicular baseline, time interval (day), percentage of unwrapped pixel coverage, average coherence.

what is the perpendicular baseline unit? and what the difference between negative and positive value?

[yumorishita]

Unit is meter. The positive and negative values are simply because of the definition.

[as1234554321]

#244 (comment)

hi sir
I have clipped the frame with my area of interest in steps 0-5, if I do the decomposition process, do I have to align the reference points with LiCSBAS_cum2vel.py before?

[yumorishita]

You don't have to, but it would be better to do it.