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esrivas17 / gacos_correction_for_GMTSAR

Atmospheric GACOS correction adapted for GMTSAR
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some questions about processing the script #2

Closed Luvina0503 closed 2 years ago

Luvina0503 commented 2 years ago

Dear author, As a beginner, I encountered difficulties in the step of GACOS calibration. I would like to ask you about GACOS_ Problems with correction.csh and operation.csh. Sentinel data time: 2021.7.17/2021.8.10/2021.8.22/2021.9.3/2021.9.27 supermaster: 2021.9.3 Picture 1 is the file after merging and unwrapping, and Picture 2 is the content of each sub file. Question:

  1. Based on the above data, I do not understand what time should I download the GACOS data?
  2. GACOS datas have only ztd and .ztd preview, no *. ztd.rsc.(Figure 3) Why is this? 3、GACOS. csh list interferograms full path to GACOS data full path topo reference point incidence angle list Interferograms refers to intflist (Figure 4)? In which file can they find reference point incidence angle? 4、gacos operation. csh master ztd master ztd. rsc slave ztd slave ztd. rsc reference point incidence angle what date does slave_ ztd refer to? Figure 1: image Figure 2: image Figure 3: image Figure 4: image

Thank you!

esrivas17 commented 2 years ago

Hi, Sorry for the late response. I don't check my Github very often, but I should. 1.- I would say you should download GACOS data around the same time of the acquisition time. This is stated in the zip file name for every S-1 data. 2.- Probably you downloaded Geotiff format. I suggest you get the binary form, the .ztd.rsc is the header file and is needed to resample and convert the data. 3.- Yes, list of interferograms refers to inftlist. Just make sure it is in the same directory you run the commands. 4.- GACOS corrections are based on atmospheric measurements that are converted to phase or meters and then applied to your interferogram. Therefore, you need GACOS from your master date and slave date, get the correction and apply it to your interferogram.

Luvina0503 commented 2 years ago

@esrivas17 Thank you for your answer. The problem has been solved