Getting metadata using SentinelHubRequest

3 months ago
26 April 2024
6 replies
3 views

SentinelHub User
4181 posts replied to

Hello everyone,

Is there a way to get the metadata of the downloaded image? Like the date or the name of the Tile.

I’am using the SentinelHubRequest class.

And calling the method like:

    request_all_bands = SentinelHubRequest(
    data_folder = sentinel_folder,
    evalscript=evalscript_all_bands,

    input_data=[
        SentinelHubRequest.input_data(
            data_source=DataSource.SENTINEL2_L2A,
            time_interval=('2020-01-01', '2020-09-11'),
            mosaicking_order= "mostRecent",
            maxcc= 0.05,        
    )],
    responses=[
        SentinelHubRequest.output_response('default', MimeType.TIFF)
    ],
    bbox=bbox,
    size=size,
    config=config)

6 replies

It is.

curl example is shown in Sentinel Hub docs. With Python an example that retrieves a normalisation factor for S2L1C data is shown in this example .

Outputing the ‘scene’ object should probably get all the info you are after, see scene object description on SH docs.

Hope that helps.

SentinelHub User
Author
4181 posts replied to
3 months ago
26 April 2024

thanks I could make it work correctly, but it seems that the metadata for sentinel2-L2A is empty, finally I ended up using WcsRequest, to get the information

Hi,

It works for me, using the following:

evalscript = """
    //VERSION=3

    function setup() {
        return {
            input: [{
                bands: ["B02", "B03", "B04"],
                units: "DN"
            }],
            output: {
                bands: 3,
                sampleType: "INT16"
            },
            mosaicking: Mosaicking.TILE
        };
    }

    function updateOutputMetadata(scenes, inputMetadata, outputMetadata) {
        outputMetadata.userData = { "norm_factor":  inputMetadata.normalizationFactor, 
                                    "scenes":  JSON.stringify(scenes)}
    }

    function evaluatePixel(sample) {
        return [sample.B04, sample.B03, sample.B02];
    }
"""

request_multitype = SentinelHubRequest(
    evalscript=evalscript,
    input_data=[
        SentinelHubRequest.input_data(
            data_collection=DataSource.SENTINEL2_L2A,
            time_interval=('2020-06-01', '2020-06-30'),
            mosaicking_order='leastCC'
        )
    ],
    responses=[
        SentinelHubRequest.output_response('default', MimeType.TIFF),
        SentinelHubRequest.output_response('userdata', MimeType.JSON)
    ],
    bbox=betsiboka_bbox,
    size=betsiboka_size,
    config=config
)

multi_data = request_multitype.get_data()[0]
multi_data['userdata.json']['scenes']

gives me this:

Hope this will help.

SentinelHub User
Author
4181 posts replied to
3 months ago
26 April 2024

batic:

evalscript = """
    //VERSION=3

    function setup() {
        return {
            input: [{
                bands: ["B02", "B03", "B04"],
                units: "DN"
            }],
            output: {
                bands: 3,
                sampleType: "INT16"
            },
            mosaicking: Mosaicking.TILE
        };
    }

    function updateOutputMetadata(scenes, inputMetadata, outputMetadata) {
        outputMetadata.userData = { "norm_factor":  inputMetadata.normalizationFactor, 
                                    "scenes":  JSON.stringify(scenes)}
    }

    function evaluatePixel(sample) {
        return [sample.B04, sample.B03, sample.B02];
    }
"""

i am using your script and get all metadata, but the image only return number 0 or nan, you know why?
When i remove “mosaicking: Mosaicking.TILE”, the image return well.
thanks .

SentinelHub User
Author
4181 posts replied to
3 months ago
26 April 2024

I faced same issue. Any update?

Hi,

When using TILE mosaicking the sample object in the evaluatePixel function is an array. You need to specify to which item you want to access, e.g. return [sample[0].B04, sample[0].B03, sample[0].B02]; (see our documentation for more details).

If this does not help, please share your curl command and we will have a look at it.