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Removal of Thermal Noise from Polarimetric Sentinel-1 SAR Data

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Noise-free-C2-graph

Removal of Thermal Noise form Single Look Complex (SLC) dual-polarization Interferometric Wide Swath (IW) Sentinel-1 (S1) SAR data using the Sentinel Application Platform (SNAP) software, provided by the European Space Agency (ESA)

The processing graph allows implementing the approach published in the article:

L. Mascolo, Juan Manuel Lopez-Sanchez, Shane R. Cloude, "Thermal Noise Removal from Polarimetric Sentinel-1 Data", IEEE Geoscience and Remote Sensing Letters, doi: https://doi.org/10.1109/LGRS.2021.3050921


File : NoiseFree_C2_single_look.xml

Input: SLC dual-polarization IW S1 data

Output: Noise-free C2 matrix, C11, C12_imag, C12_real, C22 .img files (and associated .hdr files)

Authors : L. Mascolo, Juan Manuel Lopez-Sanchez, Shane R. Cloude

Creation : 09/2020


NOTES:

 1) The processing graph available in this repository has been tested in SNAP 8, using a SLC dual-polarization VH-VV IW S1A image, collected on a sea area
 The ID of the image is: S1A_IW_SLC__1SDV_20180603T182052_20180603T182119_022196_0266A4_F6CB.SAFE
 
 2) Only a Region of Intesrest (ROI) has been processed, by selecting sub-swath IW1 and bursts 3-5, and using the Subset operator
 
 3) In the Multilook operator, the number of range looks is set to 4, the number of azimuth looks is set to 1

BEFORE RUNNING THE PROCESSING GRAPH IN SNAP

  • MANDATORY CHANGES

According to the image (or the set of images) to be processed, the user must change:

  1) The sub-swath and the bursts in the TOPSAR-Split operator, by selecting the sub-swath and the the bursts of interest
 
  2) The geographical coordinates of the ROI's polygon in the Subset operator, by updating the new coordinates relevant to ROI of interest
  • OPTIONAL CHANGES

According to the user needs, the following changes can be applied:

  1) The Subset operator can be removed from the graph
 
  2) The number of range and azimuth looks in the Multilook oprator can be changed

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