feat: add multi-band GRD wrapper and dedicated SLC GCP geolocation notebook

[Yuvraj198920]

Summary

This PR adds two enhancements to the Sentinel-1 GCP geolocation notebooks.

Changes

GDAL_Sentinel-1_GCP_Geolocation.ipynb (GRD notebook)

• Add Multi-Band GRD Wrapper section (section 4): opens GRD in default GRD_MULTIBAND=YES mode, verifies GCPs, warps both VV+VH bands, visualizes backscatter side-by-side
• Replace inline SLC code section with a cross-reference link to the new dedicated SLC notebook

GDAL_Sentinel-1_SLC_GCP_Geolocation.ipynb (new notebook)
Full GCP geolocation walkthrough for SLC burst subdatasets:

1. Open a burst with BURST=IW1_VV_001
2. Inspect GCPs (count, SRS, extent)
3. Visualize GCP grid (image space + geographic space)
4. Pixel-to-geographic coordinate transform (corner points via GCP polynomial)
5. Warp burst amplitude to WGS 84
6. Compare GCP extents across IW1, IW2, IW3 subswaths (table + footprint map with geopandas basemap)

Related

• Ported from GDAL-ZARR-EOPF verification notebook 14
• Closes Add Sentinel-1 GCP geolocation and SLC burst selection notebooks (from GDAL-ZARR-EOPF) #229 (if applicable)

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[Yuvraj198920]

@clausmichele @konstntokas — updated GDAL_Sentinel-1_GCP_Geolocation.ipynb with a new Multi-Band GRD Wrapper section and added a new dedicated notebook GDAL_Sentinel-1_SLC_GCP_Geolocation.ipynb covering full GCP geolocation for SLC burst subdatasets (inspect, visualize, warp, compare across subswaths). Would appreciate your review!

[konstntokas]

@Yuvraj198920 what is the status here? Can we merge it soon?

[clausmichele]

@konstntokas I missed this PR, I will review it today and merge it

[clausmichele]

@senmao apparently the products @Yuvraj198920 used in the two notebooks here have been removed or are not accessible anymore. This is strange, since they were under the specific notebook-data bucket, which shouldn't be cleared.

The products are:
https://objects.eodc.eu/e05ab01a9d56408d82ac32d69a5aae2a:notebook-data/tutorial_data/cpm_v264/S1C_IW_GRDH_1SDV_20260205T120122_20260205T120158_006220_00C7E4_5D6E.zarr
https://objects.eodc.eu/e05ab01a9d56408d82ac32d69a5aae2a:notebook-data/tutorial_data/cpm_v262/S1C_IW_SLC__1SDV_20251016T165627_20251016T165654_004590_00913B_30C4.zarr

[senmao]

@clausmichele @Yuvraj198920 I just checked it, these two datasets are still existing in the bucket. Below is screenshot of one dataset in S3 browser. could it be the stac item href changed ?

[clausmichele]

Thanks for checking @senmao, I will investigate further!

[clausmichele]

Hi @Yuvraj198920, in the cell Multi-Band GRD Wrapper I am getting the following error. The data exists but the code can't find the GCPs. I used your latest image for testing: https://hub.docker.com/r/yuvraj1989/eopf-zarr-driver/tags

Bands:     0  ()
Size:      512 x 512
GCP count: 0
GCP SRS:   NONE

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[15], line 19
     16 lons_mb = [g.GCPX for g in gcps_mb]
     17 lats_mb = [g.GCPY for g in gcps_mb]
     18 print(
---> 19     f"Extent:    lon [{min(lons_mb):.3f}, {max(lons_mb):.3f}]  lat [{min(lats_mb):.3f}, {max(lats_mb):.3f}]"
     20 )
     22 # Warp both bands to WGS 84 using GCPs
     23 warped_mb = gdal.Warp(
     24     "",
     25     ds_mb,
   (...)
     30     resampleAlg="near",
     31 )

ValueError: min() arg is an empty sequence

I also tested with a 2.7.0 product from STAC, but same error.

Could you check please?

[Yuvraj198920]

@clausmichele Thanks for the new URL, i will update the notebook and check the error.

[konstntokas]

@Yuvraj198920 can we close this before the retrospective meeting on July 21st?

[clausmichele]

@konstntokas The new GDAL 5.0 image is broken, I can't test the notebook and will wait for a fix after @Yuvraj198920 comes back to work (24th of July).

Link to test it:
https://jupyterhub.user.eopf.eodc.eu/hub/login?next=%2Fhub%2Fspawn%3Fnext%3D%252Fhub%252Fuser-redirect%252Fgit-pull%253Frepo%253Dhttps%253A%252F%252Fgithub.com%252FEOPF-Sample-Service%252Feopf-sample-notebooks%2526branch%253Dmain%2526urlpath%253Dlab%252Ftree%252Feopf-sample-notebooks%252Fnotebooks%252FSentinel-3%252FGDAL_Sentinel-3-OLCI-Level-1-EFR.ipynb%23fancy-forms-config=%7B%22profile%22%3A%22choose-your-environment%22%2C%22image%22%3A%22unlisted_choice%22%2C%22image%3Aunlisted_choice%22%3A%22yuvraj1989%2Feopf-zarr-driver%3A5.0%22%2C%20%22autoStart%22%3A%22true%22%7D

[Yuvraj198920]

@clausmichele The 5.0 image is fixed and re-published under the same tag.
Thanks.
cc @konstntokas