Sentinel-1 radar data all zeros with Python SentinelHub API

Question

I am requesting Sentinel-1 SAR data but rather than throwing an error the code is just returning zeros.

My request:

bbox = BBox([-145.8, 60.96, -146.5, 61.38], crs=CRS.WGS84)
bbox_size = bbox_to_dimensions(bbox, resolution=100)
time_interval = ('2018-07-01', '2018-07-16')

evalscript_all_bands = """
    //VERSION=3
    function setup() {
        return {
            input: [{
                bands: ["HV"],
            }],
            output: {
                bands: 1,
            }
        };
    }

    function evaluatePixel(sample) {
        return [sample.HV];
    }
"""

request_all_bands = SentinelHubRequest(
    evalscript=evalscript_all_bands,
    input_data=[
        SentinelHubRequest.input_data(
            data_collection=DataCollection.SENTINEL1_EW,
            time_interval=time_interval,
    )],
    responses=[
        SentinelHubRequest.output_response('default', MimeType.TIFF)
    ],
    bbox=bbox,
    size=bbox_size,
    config=config
)

data = request_all_bands.get_data()

print(len(data))

print(data[0][:,:].shape)

plt.imshow(data[-1][::],aspect='auto')

The output of this is an array of zeros - no error message. Can anybody suggest a time period or region where I can find some data?

Answer 1

The EW mode is quite rare, only available for specific regions, see the Sentinel-1 Observation scenario.

If you want these specific type of data, you can e.g. find them here, for the same time period:

bbox = BBox([-145.8, 60.96, -146.5, 61.38], crs=CRS.WGS84)

If you are not certain, where there are some data, I suggest to use EO Browser, select Sentinel-1, then "Advanced search" and filter for the type you are interested in.

There is no error message as there is simply no data here.