Dear @Muhammad Budi

You need to work with SLC not GRD when you study about displacement and deformation because only SLC have phase and amplitude while GRD have only amplitude.

My Greeting

Of course GRD。 You do not need phase and amplitude to estimate soil moisture. Most studies use intensity. Whereas you will need georeferenced image to validate against observations

both products are free.

GRD is kind of a secondary product of SLC. You can make a GRD out of a SLC product by multi-looking but you cannot get it backwards. The main difference is that SLC is in slant geometry (some pixels are closer to the satellite than others, thus the incidence angle is different) and additonally contain phase information (besides backscatter intensity).

File sizes depend on the polarization (single or dual) but are roughly 450-900 MB (GRD) and 4-8 GB (SLC) respectively.

If you are not interested in an interferometric approach (which doesn't make much sense for soil moisture), GRD data is totally sufficient. But you should calibrate your data at a first step. Maybe also thermal noise removal is for your S1 images.

In my experience, GRD turned to be good for estimation of Soil moisture. If you want to try with SLC data you need high computing power for processing the SAR data.

I follow the option B

All the best

@Lakshmi,

Thank you very much. 

I am also working on the soil moisture retrieval from the microwave remote sensing. Could you please brief me about the basic steps for retrieval of soil moisture?

Hi guys, what about active faults? Which one is better to use, GRD or SLC? Thank You, your answers will be helpful for me

Dear @Muhammad Budi

You need to work with SLC not GRD when you study about displacement and deformation because only SLC have phase and amplitude while GRD have only amplitude.

My Greeting

Dear @Ammar Abd , I have question, when do i input in SNAP, why in Sentinel 1A just has Intensity, I dont find Phase and Amplitude. Thankyou

very interesting topic

Dear it is better ti use GRD to estimate the soil moisture

My regards

For DEM generation, which one is better GRD or SLC?

@Rahul

I think you need SLC to create DEM.

as Hayder said " because only SLC have phase and amplitude while GRD have only amplitude".

i just googling and find this useful links:

" How to produce high-resolution DEMs from new Sentinel-1 data?"

https://gis.stackexchange.com/a/120467

https://forum.step.esa.int/t/the-order-of-dem-creating-steps/5771

I just copy some text from " Kersten " in https://gis.stackexchange.com witch specify some step in DEM creation from Radar data:

Steps required to create a DEM

• co-register scenes
• calculate baselines
• create interferogram and extract phase information
• correct for sensor movement, flat earth removal, athmosphere, etc.
• convert differential phase to absolute phase differences
• phase unwrapping
• phase to height conversion
• correct for absolute elevation, phase jumps, etc()

SNAP is little slow! Any other open source software to process the Sentinal data?

Dear Rahul Devrani,

Just followed the topic, and although you set your question 2 months ago I am wondering If you have tried working SNAP via Copernicus RUS Virtual Machine (cloud-computing environment) ? The processing is done via a cloud environment using RUS server's resources and not your own hardware's. You can describe your needs and the RUS support team will make sure you have the adequate resources to run your processes sufficiently. For more info please refer to https://rus-copernicus.eu/portal/the-rus-service/how-does-rus-work/. On the other hand If you have found open source software other than SNAP processing Sentinel faster please share...

Greetings

Please, I would like to work with the land cover types in urban areas, which is better? SLC or GRD? Why? Thank you.

@J. Zhao

Links below may answer your Question

https://aaltodoc.aalto.fi/handle/123456789/28445

http://lup.lub.lu.se/student-papers/record/8915043/file/8915048.pdf

Regard

@Meeland Okay. Thank you very much.

@Meeland Okay.

I am very appreciate your comments.

Thank you very much.

Can anybody add a graph for SLC data pre-processing in SNAP?

I want to study riverbank erosion.

Md Tawhid Hossain you can find "SLC data pre-processing in SNAP "

Direction--> Tools-- GraphBuilder-- Graphs-- Radar-- InSAR Graphs

Baha Bilgilioğlu thank you.

hi, does anyone know which one is better for processing ship detection? GRD or SLC?

@sarah putri fitriani

you can use GRD version. Also SNAP has an operator for ship detection called “Ocean Object Detection” under Radar->SAR Application->Ocean Application

It maybe useful to your project. For pre-processing, you may want to do the calibration and speckle filtering.

Hi

I think this link can help you to choice the best one.

good luck every one

https://sentinel.esa.int/web/sentinel/user-guides/sentinel-1-sar/product-overview/polarimetry

CAN YOU PLEASE ADD THE PROCESSING STEPS FOR PRODUCING INSAR FROM SLC

I hope this SNAP workflow that I developed some time ago and this link will help. You could also add DerampDemod step in the preprocessing.

https://forum.step.esa.int/t/subsidence-map/10621/34

Hi Sayan,

GRD is better for vegetation. There are different processing steps possible, but Calibration and Terrain correction (usually Range Doppler) steps are necessary. You can also add steps like Thermal noise removal, Speckle filtering, etc. If you work in SNAP it is always a good idea to have the Applying orbit file operator as your first step.

Gregoriy