Calculate the ratio of the backscatter coefficients

s1tbx
#1

Hello,everyone!

I have three S1 SLC datas(different times)，and I want to calculate the ratio of the backscatter coefficients between them.The processing steps I am using is as follow:

  1. calibration
  2. Deburst
  3. Multilook
  4. speckle filtering
  5. Terrain Correction
  6. DEM-Assisted Coregistration

But there would be a error ‘0’ when I run DEM-Assisted Coregistration.What’s wrong with my processing steps?And what should I do next?

Thank you!

#2

what DEM did you use for the coregistration? Maybe your images are outside the SRTM coverage?

grafik
image source

#3

SRTM 3Sec.And my study area is In China,Altai Mountains .

S1A_IW_SLC__1SDV_20181006T115432_20181006T115459_024015_029FB2_E498
S1A_IW_SLC__1SDV_20190122T115430_20190122T115457_025590_02D70C_4EC1
S1A_IW_SLC__1SDV_20190323T115429_20190323T115456_026465_02F6A8_D073

I found if I input the images (calibration->Deburst->Multilook) when I run DEM-Assisted Coregistration, there wouldn’t be a error ‘0’.And now it is running slowly,I haven’t got the results yet. :flushed:

图片
图片1188×616 83.8 KB

If it works fine,can I keep doing Speckle filtering and Terrain Correction?And compared to the DEM-Assisted Coregistration,maybe I can also run coregistration->stack tools->create stack ?(I saw this from other post)

#4

for SLC data, this is not exact enough. I suggest using GRD products, apply Calibration and then Coregistration and in the end Terrain Correction.

SLC data is only suitable if you need the complex pixel information.

#5

Thank you for your answer!
Because I also want to run H/α decomposition,so I choose to use SLC data.
And for SLC,if now I need to calculate the ratio of the backscattering coefficients between three images(different times),could you tell me a complete processing procedure?

#6

you find suggestions for both products here: Radiometric & Geometric Correction Workflow

#7

Thank you!