SLC to GRD workflow. Different steps

Microwave Toolbox
13

Hi @cristianoLopes,

I have checked your post and I need some clarity…

First link (https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S1_GRD) shows how each scene has been pre-processed using Sentinel-1 toolbox:

  1. Thermal noise removal
  2. Radiometric calibration
  3. Terrain correction using SRTM 30 or ASTER DEM for areas greater than 60 degrees latitude, where SRTM is not available. The final terrain-corrected values are converted to decibels via log scaling (10*log10(x)).

It´s ok, I understand. It´s similar to my workflow GRD_Hub to GRD.
However, the article linked (https://developers.google.com/earth-engine/guides/sentinel1) to those steps shows:

  1. Apply orbit file; restituted orbit file.
  2. GRD border noise removal.
  3. Thermal noise removal.
  4. Radiometric calibration.
  5. Terrain correction; orthorectification); using SRTM 30 meter DEM or the ASTER DEM for high latitudes (greater than 60° or less than -60°).

Both workflows are clear but I need to know which one is followed to obtain GRD.

Thanks in advance,

Juanjo V.