NISAR_DualPol_CloudePottier_DPID notebook added

[ials]

Illustration of SAR dual polarization concepts, along with two supporting Python utility modules.

Changes Made

• notebooks/NISAR_DualPol_CloudePottier_DPID.ipynb: Interactive tutorial explaining dual polarization matrices and decomposition.
• utils/nisar_polsar.py: Python script with SAR processing utilities for NISAR dual-pol GSLC analysis.
• utils/nisar_plot_utils.py: Python script containing plotting functions for polarization bands.

How to Test

1. Open notebooks/NISAR_DualPol_CloudePottier_DPID.ipynb in Jupyter.
2. Run all cells sequentially to verify the plots render correctly using the new utility scripts.

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[github-actions]

👋 Thanks for opening this PR! The Cookbook will be automatically built with GitHub Actions. To see the status of your deployment, click below.
🔍 Git commit SHA: c637e82
✅ Deployment Preview URL: https://ASFOpenSARlab.github.io/NISAR_Cookbook/_preview/36

[Alex-Lewandowski]

@ials Thank you very much for contributing your polarimetry workflow! I have scheduled some time to test and review it on Wednesday.

[review-notebook-app]

View / edit / reply to this conversation on ReviewNB

Alex-Lewandowski commented on 2026-07-28T17:27:09Z
----------------------------------------------------------------

• Make the title a level-1 header (using a single # instead of ##)
• Make the Overview a level-2 header (##)
• The Overview should be a list of notebook section links. The current overview content could move above the overview section.
• The template notebook demonstrates how to create linkable notebook sections for the overview
• Add horizontal rules to separate each notebook section (<hr>)
• Add a Prerequisite section (see notebook template)
• Move the author and references to the last markdown cell in the notebook with the title "Resources and references"
• See the NISAR Cookbook notebook template
• Remove standalone installation instructions and move Python dependencies into the Cookbook's Pixi environment
• It worked to add:
• These to the "feature.isce3.dependencies" section of the pixi.toml:

               hdf5plugin = "*"
               rasterio = "*"
               pyproj = "*"
               scipy = "*"

• This as a new "feature.isce3.pypi-dependencies" section:

                       [feature.isce3.pypi-dependencies]
                       opencv-python = "*" 

[Alex-Lewandowski]

@ials, I apologize that it took a bit longer than intended to start reviewing your notebook. The first comment addresses notebook formatting and handling of the software environment. I will likely have more feedback as I begin to dive into the code. Thank you again for the contribution!

[review-notebook-app]

View / edit / reply to this conversation on ReviewNB

Alex-Lewandowski commented on 2026-07-28T17:37:18Z
----------------------------------------------------------------

It would be helpful to include some code that searches and downloads a GSLC. There is an example that you could copy/paste from in section 2 of this notebook.

[ials]

@Alex-Lewandowski, thank you for your feedback. I've done the changes.