Sun Zenith Angle for Sentinel 3

1

Hi,

I require sun elevation angle in my python script on a daily basis.

But sun elevation angle is not available on a daily basis. Sentinel 3 provides sun zenith angle on a daily basis in the form of a band as mentioned here in this link in the available bands section.

There is a direct complimentary angles relation between sun elevation angle and sun zenith angle.
I am unable to download the sun zenith angle band as I cannot find the evalscript for it.

Can you help in setting up the sun zenith angle layer on sentinelhub as this is very important for us and a priority.

Thank you
Sidharrth

2

Hi Sidharrth,

This curl request shows you how to download the SAA and SZA bands:

curl -X POST https://creodias.sentinel-hub.com/api/v1/process \
 -H 'Content-Type: multipart/form-data' \
 -H 'Authorization: Bearer <access_token>' \
 --form-string 'request={
  "input": {
    "bounds": {
      "bbox": [
        12.44693,
        41.870072,
        12.541001,
        41.917096
      ]
    },
    "data": [
      {
        "dataFilter": {
          "timeRange": {
            "from": "2024-02-22T00:00:00Z",
            "to": "2024-03-22T23:59:59Z"
          }
        },
        "type": "sentinel-3-olci"
      }
    ]
  },
  "output": {
    "width": 512,
    "height": 343.697,
    "responses": [
      {
        "identifier": "default",
        "format": {
          "type": "image/tiff"
        }
      }
    ]
  }
}' \
 --form-string 'evalscript=//VERSION=3
function setup() {
  return {
    input: [{
      bands: [
        "SAA",
        "SZA",
        "dataMask"
      ]
    }],
    output: {
      bands: 3,
      sampleType: "UINT16"
    }
  }
}
function evaluatePixel(samples) {
    return [samples.SAA, samples.SZA, samples.dataMask]
}
'
4

Hi @william.ray

Is there a way to find out the time when this zenith angle data from sentinel 3 olci has come. ]

Thanks
Sidharrth

5

Hi,

You can copy and paste the request I shared into Request Builder and convert it this way. This will give you a chance to update the input parameters too.