Missing Sentinel 1 GRD product from Planetary STAC

[rishabhjain4]

Hi,
I was checking the feasibility to use Planetary stac for fetching S1 metadata for a bbox and for certain time period. Below is the code to replicate my concerns.

from pystac_client import Client
catalog = Client.open('https://planetarycomputer.microsoft.com/api/stac/v1')
bbox = [73.035264, 8.795702, 79.567607, 23.077675]

results = catalog.search(
    collections =['sentinel-1-grd'],
    bbox= [73.035264, 8.795702, 79.567607, 23.077675],
    #intersects= box(*[73.035264, 8.795702, 79.567607, 23.077675]),
    datetime=['2021-01-01', '2024-03-20'],
    fields={
        "include": [
            "id",
            "properties.datetime",
            "geometry",
            "type",
            "stac_version",
        ]})
satellite_items = [i.to_dict() for i in results.items()]
print(len(satellite_items))

This prints 3456 from PyStac. Which includes dates 2021-01-01 and 2024-03-20

Similarly I did a quick search using asf_search python module by alsaka search facility.

import asf_search as asf
import geopandas as gpd
from shapely.geometry import box
from datetime import datetime

start = "2021-01-01"
end = "2024-03-21"
start_date = datetime.strptime(start, "%Y-%m-%d")
end_date = datetime.strptime(end, "%Y-%m-%d")

wkt_str = box(*[73.035264,  8.795702, 79.567607, 23.077675]).wkt

downLoadCandidates = asf.search(
        platform= [asf.PLATFORM.SENTINEL1A,asf.PLATFORM.SENTINEL1B],
        processingLevel=[asf.PRODUCT_TYPE.GRD_HD],
        start = start_date,
        end= end_date,
        intersectsWith = wkt_str,
        beamMode = asf.BEAMMODE.IW,
            )

print(len(downLoadCandidates)) #3667

# To get a dataframe
frm_asf = pd.DataFrame()
frm_asf['polygon']=None
for i,h in enumerate(downLoadCandidates):
    
    pid = h.properties['sceneName']
    s1_date = h.properties['startTime'].split("T")[0]
    frm_asf.at[i,'Product'] = pid[:-5]
    frm_asf.at[i,'S1Date'] = s1_date
    frm_asf.at[i,'polygon'] =  h.geometry

Here almost 211 products go missing in the Planetary Stac sentinel 1 grd products.

For the missing 211 products I did the following.

1. Check if they were falling only on start and end date.

• they are falling all across the date range.

2. Check if these are only at the edges of the bbox being used.

• They are all falling inside the bbox as well intersecting with the bbox.

3. I also checked if these Sentinel 1 products are available in the following AWS s3 bucket
   which is s3://sentinel-s1-l1c/GRD and it happens to be present in the AWS S3 bucket.

Is there any reason that these Sentinel 1 Images were dropped when the PyStac for sentinel-1-grd was created?

Atacching the list of missing 211 products.
missed_from_mp.csv