Sampletype float32 in costum script returns UINT8 (sentinel-hub py)

Apps / Services Python SDK
1

I have used Custom script editor in order to create script that will mask clouds. I want to check if they are really masked by plotting the image.
The problem is that when I use get_data and priint the results, the results are in UINT8.

This is my costum script in the cinfugruation utility:

//VERSION=3
function setup() {
  return {
    input: ["B04", "B08", "CLM"],
    output: { bands: 1 },
    sampleType:"FLOAT32"
  };
}

function evaluatePixel(sample) {
  let ndvi = index(sample.B08, sample.B04);
  if (sample.CLM == 1) {
    return [null]
  }
  return [ndvi];
}

the idea- return null value if there is a cloud.

Then when I retrieve images and print the values:

wms_bands_request = WmsRequest(
            data_collection=DataCollection.SENTINEL2_L2A,
            data_folder='{}/{}/{}'.format(folder_,date,plot),
            layer='NDVI_MASK_CLOUD',
            bbox=bbox,
            time=date,
            width=bbox_size[0],
            height=bbox_size[1],
            image_format=MimeType.TIFF,
            time_difference=datetime.timedelta(hours=2),#get one image when there is small time differences between them
            config=config)
        
        
        wms_bands_img = wms_bands_request.get_data(save_data=False)

image

I have no idea why does it happen as the sampleType in the costum script is float32.

1 Like
2

You have defined the “sampleType” outside of the “output” block, so it is essentially ignored, replaced with DEFAULT, which is UINT8.

Try replacing your EVALSCRIPT setup() part with:

function setup() {
  return {
    input: ["B04", "B08", "CLM"],
    output: {
      bands: 1, 
      sampleType: "FLOAT32"
    }
  };
}

More info in the documentation:

1 Like