On experimenting with HLS data recently I was expecting to get valid data produced in HLS for each valid capture of LANDSAT & SENTINEL data. But it is not the case, On multiple cloud free days HLS dataset for my AOI is not having valid pixels.
Gijon_FU.kml (702 Bytes)

One such date Instances where HLS download images comes out complete blank and no data shown eo-browser is 2019-03-31 (See corresponding Sentinel 2 constellation data available).

I downloaded HLS image for this date but it is all masked.

QGIS capture showing all complete black image.

EvalScript Used

// VERSION 3

    function setup() {

    return {

        input: [{

        bands: ["Red", "Green", "Blue", "NIR_Narrow", "SWIR1", "QA", "dataMask"], // this sets which bands to use

        units: "DN"

        }],

        output: {

        bands: 7,

        sampleType: "UINT16" // raster format will be UINT16

        }

    };

    }

    function evaluatePixel(sample) {

    return [sample.Red, sample.Green, sample.Blue, sample.NIR_Narrow, sample.SWIR1, sample.QA, sample.dataMask];

    }

I tried downloading HLS data with cloud filters but on my AOI I am getting 50% of the images as invalid having no valid pixels? What could be the reason behind these instances?