Get metadata from Sentinel-1 imagery

Apps / Services Python SDK
1

Hi all,

I’m trying to extract the metadata of a Sentinel-1 scene. I’ve followed several tutorials and examples, but the userData.json file returned is null every time, which doesn’t happens for Sentinel-2 scenes. I don’t know if I’m missing something or the scenes for Sentinel-1 are different. It’s important to say that the image is from one specific day, not a mosaic.

The evalscript I use is the following:

                //VERSION=3
                function setup() {
                    return {
                        input: [{
                            bands: ["VH", "VV"]
                        }],
                        mosaicking: Mosaicking.ORBIT,
                        output: {
                            id: "default",
                            bands: 2
                        }
                    };
                }

                function evaluatePixel(sample) {
                    return [sample.VH, sample.VV];
                }

                function updateOutputMetadata(scenes, inputMetadata, outputMetadata) {
                    outputMetadata.userData = { "scenes":  scenes.orbits }
                }
2

Hi,

I cannot reproduce your problem: I get a populated userdata file for Sentinel-1, even for a single date using your Evalscript. Would you care to share your payload so we can take a look?

3

Sure, I attach the rest of the code


time = ('2021-09-26', '2021-09-26')
bbox = (101.298014, 17.297079, 101.347986, 17.343721)

process_requests = list()
request = SentinelHubRequest(
                    data_folder=data_folder,
                    evalscript=evalscript,
                    input_data=[
                        SentinelHubRequest.input_data(
                            data_collection=DataCollection.SENTINEL1,
                            time_interval=time,
                            mosaicking_order=None
                        )
                    ],
                    responses=[
                                SentinelHubRequest.output_response("default", MimeType.TIFF),
                                SentinelHubRequest.output_response("userdata", MimeType.JSON),
                    ],
                    bbox=bbox,
                    size=bbox_to_dimensions(bbox, 1000),
                    config=config,
                )
                process_requests.append(request)

download_client = SentinelHubDownloadClient(config=config)
download_requests = [request.download_list[0] for request in process_requests]
data = download_client.download(download_requests)
4

Very strange… when I run your code I get the following:

'userdata.json': {'scenes': [{'tiles': [{'date': '2021-09-26T23:08:35Z',
       'shId': 2468928,
       'tileOriginalId': 'S1A_IW_GRDH_1SDV_20210926T230835_20210926T230900_039859_04B728_9D6F',
       'dataPath': 's3://sentinel-s1-l1c/GRD/2021/9/26/IW/DV/S1A_IW_GRDH_1SDV_20210926T230835_20210926T230900_039859_04B728_9D6F'}],
     'dateTo': '2021-09-26T23:59:59Z',
     '__idx': 0,
     'dateFrom': '2021-09-26T00:00:00Z'}]}}

I did modify the code for it to run with:

coords = (101.298014, 17.297079, 101.347986, 17.343721)
bbox = BBox(coords, crs="EPSG:4326")

but asides from this all is the same as you!