Sentinel1_grd

openEO Platform
, ,
1

Hello,

I just wanted to know why SENTINEL1_GRD collection is not working.

When I try to query the data :

image
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I get a this error :

OpenEO batch job failed: Exception during Spark execution: Sentinel Hub returned an error response: HTTP/1.1 400 Bad Request with body: {“error”:{“status”:400,“reason”:“Bad Request”,“message”:“Requested band ‘HV’ is not present in Sentinel 1 tile ‘S1A_IW_GRDH_1SDV_20230517T051224_20230517T051249_048569_05D787_8E4C’ returned by criteria specified in dataFilter parameter.”,“code”:“RENDERER_S1_MISSING_POLARIZATION”}}

Then I tried to launch the same graph without HV, and I get the same error but for HH.

Finally I did a last test specifying only ‘VV’ and ‘VH’ polarizations. The job finished without error but it s not possible to vizualize/download it.

image

Any tips ?

Thanks for answering.

BEHLOUL Selim

2

Hi Selim,

Could you provide the process graph?

3

Hello Jan,

Here is the JSON associated to the graph with the last case, that is to say when I specify only for VV and VH polarizations :

{
“process_graph”: {
“load1”: {
“arguments”: {
“bands”: [
“VV”,
“VH”
],
“id”: “SENTINEL1_GRD”,
“spatial_extent”: {
“east”: 14.3537681,
“north”: 40.916123,
“south”: 40.7912976,
“west”: 14.1320999
},
“temporal_extent”: [
“2023-05-01T04:14:15Z”,
“2023-05-31T00:00:00Z”
]
},
“process_id”: “load_collection”
},
“save2”: {
“arguments”: {
“data”: {
“from_node”: “load1”
},
“format”: “GTIFF”
},
“process_id”: “save_result”,
“result”: true
}
}
}

4

Re: the process graph with VV and VH bands:

This is a bug on our end that’s being fixed. I’m not sure how tech-savvy you are but there are workarounds to download its results, should you need them.

5

Re: missing HV and HH bands:

Here’s some valuable info: https://github.com/openEOPlatform/architecture-docs/issues/155

S1 never acquires images with all polarization. There is general schema that HH/HV is acquired over the poles and VV/VH is aquired elsewhere (see graphic on the observation scenarios here). Unfortunately locally different modes and polarization are possible.

So if you don’t specify a band filter in your process graph, you implicitly request all bands but that’s not generally possible. The error message gives an indication on how to fix your process graph:

Closing this as we improve the error reporting and are now returning something more meaningful that indicates clearly to the user where the error in his request is/was. This should enable the user to debug his pg himself and try with a different band.

Maybe @daniel.thiex can chip in.

6

Not much to add here besides from what you already wrote (that we should fix the bug and that there are workarounds).

@selim.behloul If you let us know for which AOI and which time-span you are looking for S1 data I can share a pg with you that should work already.

7

Hello,

Thanks for your answer @jan.van.den.bosch about polarizations, it makes sense.

@daniel.thiex I don’t mind to get the data with your method but isn’t any other way to get it from OpeneEO ? I tried it again this morning for Napoli, then for Genoa spatial extent and I still get the same error.

I am looking for Sentinel 1 GRD data for the area of Napoli for the whole month of May either 2022 or 2023.

“spatial_extent”: {
“east”: 14.3537681,
“north”: 40.916123,
“south”: 40.7912976,
“west”: 14.1320999
}

8

@selim.behloul, a quick fix has been applied so this should at least allow you to view and download the results for the original process graph (VV/VH). Note that this does not fix your original batch job; you’ll have to run it again.

Internal ref: raster:bands statistics produce invalid JSON · Issue #471 · Open-EO/openeo-geopyspark-driver · GitHub

9

I confirm that it works now. Thank you Jan