Downloading image Pleiades from third party with size 145 bytes

Apps / Services
1

Hello, good morning. I put this post in the forum because recently when downloading an image using python request it does not download well even if the query is well created.

This is the query

{‘input’: {‘bounds’: {‘properties’: {‘crs’: ‘http://www.opengis.net/def/crs/EPSG/0/4326’},
‘bbox’: [35.93360430260824, 35.250857571893675, 35.941400182082255, 35.25644736415403]},
‘data’: [{‘type’: ‘byoc-b0eaa136-0648---************’,
‘dataFilter’: {‘timeRange’: {
‘from’: ‘2021-05-20T00:00:00.000000Z’, ‘to’: ‘2021-05-22T00:00:00.000000Z’}}}]},
‘output’: {‘width’: 2048, ‘height’: 1798,
‘responses’: [{‘identifier’: ‘default’, ‘format’: {‘type’: ‘image/tiff’, ‘quality’: 100}}]},
‘evalscript’: ‘\n //VERSION=3\n function setup() {\n return {\n input: [“B0”, “B1”, “B2”, “B3”, “PAN”],\n output: { bands: 4 }\n };\n }\n let minVal = 0.0;\n let maxVal = 3000;\n let viz = new DefaultVisualizer(minVal, maxVal);\n function evaluatePixel(samples) {\n let sudoPanW = (samples.B1 + samples.B2 + samples.B0) / 3;\n let ratioW = samples.PAN / sudoPanW;\n let ndwi = (samples.B1 - samples.B3) / (samples.B1 + samples.B3);\n let val = [samples.B2 * ratioW, samples.B1 * ratioW, samples.B0 * ratioW, ndwi];\n return viz.processList(val);\n }’}

There are times when the image can not be opened because it has a weight of 145 bytes (when it should weigh more). In this case it has happened to me in 2 different ways, the first one that only happens from time to time if I try to make the download recurrently but the other way of the error is to make the download repeatedly but in all the weight of the image is 145 bytes.

And I wanted to ask: Has anyone else had this happen to you / Is it a known error?

Just in case I put the code of how the request is being done:

    url = "https://services.sentinel-hub.com/api/v1/process"
    headers = {'content-type': 'application/json', 'Authorization': 'Bearer ' + token}
    response = requests.post(url, data=json.dumps(query), headers=headers)
2

Hi @seda.defensa ,

The error comes from the quotation marks used in the evalscript for input bands. I’ve edited your request with the right quotation marks so you can copy it and make your request.

{
  "input": {
    "bounds": {
      "bbox": [
        35.93360430260824,
        35.250857571893675,
        35.941400182082255,
        35.25644736415403
      ]
    },
    "data": [
      {
        "dataFilter": {
          "timeRange": {
            "from": "2021-05-20T00:00:00.000000Z",
            "to": "2021-05-22T00:00:00.000000Z"
          }
        },
        "type": "byoc-b0eaa136-0648-4d63-9601-************"
      }
    ]
  },
  "output": {
    "width": 512,
    "height": 343.697,
    "responses": [
      {
        "identifier": "default",
        "format": {
          "type": "image/jpeg"
        }
      }
    ]
  },
  "evalscript": "//VERSION=3\n function setup() {\n return {\n input: [\"B0\", \"B1\", \"B2\", \"B3\", \"PAN\"],\n output: { bands: 4 }\n };\n }\n let minVal = 0.0;\n let maxVal = 3000;\n let viz = new DefaultVisualizer(minVal, maxVal);\n function evaluatePixel(samples) {\n let sudoPanW = (samples.B1 + samples.B2 + samples.B0) / 3;\n let ratioW = samples.PAN / sudoPanW;\n let ndwi = (samples.B1 - samples.B3) / (samples.B1 + samples.B3);\n let val = [samples.B2 * ratioW, samples.B1 * ratioW, samples.B0 * ratioW, ndwi];\n return viz.processList(val);}\n"
}

We also hide your byoc collection id so others cannot access the data you purchased. Please be careful when sharing codes since it may contain your sensitive information.

3

Hi, thanks for the quick reply. I mean the problem is that sometimes it downloads well and sometimes badly with the same code. Is this only due to the inverted commas ?

Thank you, seda.defensa

4

Hello, I write again because recently, and even changing the corrected evalscript, when making the access request to an image downloaded from third parties, it does not download the expected size, always having a size between 122 and 146 bytes instead of ±330000 bytes.

It should be noted that the download request was made repeatedly with the same result, a total of more than 1000 repetitions.

Is this bug a known bug in sentinel hub? Could it be related to the recience error when downloading images from Planet ?

Best regards
seda.defensa