Extracted backscatter values by using SNAP toolbox

s1tbx
#26

No, it only takes the pixels under the imported points.

1 Like
#27

While importing excel file as text format another error occurred.

Screenshot (36)
Screenshot (36)1920×1080 689 KB

And my import file is;
vh sm excel edited.txt (74.5 KB)

#28

a number was missing in line 1174:

grafik

I changed it from 718 to 2718, but this did not solve the error

grafik

The problem was that the number of headers and the number of columns did not match.
I fixed it for you: vh sm excel edited_AB.txt (72.1 KB)

#29

How can I fix this error?

#30

I opened it in Excel and delted empty columns, somehow there was a shift.

#31

Back scatter values include both sigma mean db and sigma db. which is used for correlation between local incidence angle and back scatter values?

#32

mean is the average at the point and sigmal is the standard variation.
to me, only the first makes sense for this purpose.

#33

Is it possible to do multiple regression in SNAP? This is my reference journal and I don’t know how to do it.

Screenshot (40)
Screenshot (40)562×784 28.1 KB

#34

you can extract backscatter values (Sigma0VV= at your sampling points (ms) in the pin manager in the correlative plot view, but you have to export this table with the point pairs and find the regression in a more specialized software, e.g. MS Excel or SPSS.

The same task as discussed here, please have a look: Soil Moisture Mapping Using S1_SLC product and s1tx

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#35

How can I map soil moisture distribution using band math in SNAP software?

#36

please use the search function on this.

There are already so much topics on this question. Here are the most important ones:

#37

Thank you…
I calculated NDVI but confused about how to mask vegetated areas and water body using NDVI.

#38

The use of the mask manager is explained in this tutorial SAR Polarimetry and Analyses

#39

Hello,
please any help to retrieve soil moisture using sentinel 1 images. I tried Multi-pol IEM SM retrieval in SNAP but snap refuse to read the image because it misses the hh pol (my image is vh and vv pol). I need any possible solution to retrieve sm using IEM using SNAP or any other software or code I will be very thankful for any help.

#40

what data are you using?

#41

I am using sentinel 1 images

#42

Sentinel-1 does not hav HH polarization in most parts of the world. The soil moisture tool you are using requires fully polarimetric (HH/HV/VH/VV) data.

#43

Thanks for your response. So these solution is not possible for my case.please do you have any suggestion that can help me to attend my objective?

#44

Please see here: I want to extract soil moisture from SAR data

#45

I am very thankful for your help.