How to mask out cloud cover in sentinel Imagery data

Apps / Services
1

Hello community,

I am using this code to fetch the s2l2a data in form of tiff which is working perfectly from the docs.

curl -X POST \
  https://services.sentinel-hub.com/api/v1/process \
  -H 'Authorization: Bearer <your access token>' \
  -F 'request={
    "input": {
        "bounds": {
            "properties": {
                "crs": "http://www.opengis.net/def/crs/OGC/1.3/CRS84"
            },
            "geometry": {
                "type": "Polygon",
                "coordinates": [
                    [
                        [
                            -94.04798984527588,
                            41.7930725281021
                        ],
                        [
                            -94.04803276062012,
                            41.805773608962869
                        ],
                        [
                            -94.06738758087158,
                            41.805901566741308
                        ],
                        [
                            -94.06734466552735,
                            41.7967199475024
                        ],
                        [
                            -94.06223773956299,
                            41.79144072064381
                        ],
                        [
                            -94.0504789352417,
                            41.791376727347969
                        ],
                        [
                            -94.05039310455322,
                            41.7930725281021
                        ],
                        [
                            -94.04798984527588,
                            41.7930725281021
                        ]
                    ]
                ]
            }
        },
        "data": [
            {
                "type": "sentinel-2-l2a",
                "dataFilter": {
                    "timeRange": {
                        "from": "2022-10-01T00:00:00Z",
                        "to": "2022-10-31T00:00:00Z"
                    }
                },
                "processing": {
                    "harmonizeValues": "true"
                }
            }
        ]
    },
    "output": {
        "width": 512,
        "height": 512,
        "responses": [
            {
                "identifier": "default",
                "format": {
                    "type": "image/tiff"
                }
            }
        ]
    }
}' \
  -F 'evalscript=//VERSION=3
function setup() {
  return{
    input: [{
      bands: ["B04", "B08"],
      units: "REFLECTANCE"
    }],
    output: {
      id: "default",
      bands: 1,
      sampleType: SampleType.FLOAT32
    }
  }
}

function evaluatePixel(sample) {
  let ndvi = (sample.B08 - sample.B04) / (sample.B08 + sample.B04)
  return [ ndvi ]
}'

However some data seems to come with a lot cloud cover in some dates. How can I exclude the clouds inside the area of interest.

Regards,
Edwin.

2

Hi Edwin, there are plenty of examples of evalscripts on the Custom Scripts Repository, that mask out cloud cover of Sentinel-2 L2A data. For example;

3

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