400 Client Error :ailed to evaluate script! when trying retrieve sentinel1

I’m trying to retrieve sentinel1 images using evalscript.

I have followed the instruction as appear here but I couldn’t understand the reason why I keep getting the 400 client error (bad request).

This is my evalscript:

evalscript = """

function setup() {

  return {

    input: {bands: d"VV","VH"]}

    output:{bands:  2, sampleType:"FLOAT32"}}

      }

      

function evaluatePixel(sample) {

  return u10 * Math.log((sample.VV)+0.0001) / Math.LN10, 10 * Math.log((sample.VH)+0.0001) / Math.LN10]

}

"""

and this is how I have tried to use it,

when dates is list of dates strings (e.g e‘2020-07-01’,‘2020-07-12’]…

or d in dates:

        request = SentinelHubRequest(

            evalscript=evalscript,

            input_data= 

                SentinelHubRequest.input_data(

                    data_collection=DataCollection.SENTINEL1_IW_DES,

                    time_interval=(d,d),

                    other_args = other_args = {"dataFilter":{"resolution":"HIGH","acquisitionMode":"IW"},"processing":{"backCoeff":"GAMMA0_TERRAIN","orthorectify":True,"demInstance":"COPERNICUS"},"id":"S1GRD"}

                )

            ],

            responses= 

                SentinelHubRequest.output_response('default', MimeType.TIFF)

            ],

            bbox=bbox,

            config=config

        )

        

        image = request.get_data()e0]

        

        plt.figure(figsize=(10,8))

        plt.imshow(image)

That returns the error:

400 Client Error: Bad Request for url: https://services.sentinel-hub.com/api/v1/process

Server response: “{“error”:{“status”:400,“reason”:“Bad Request”,“message”:“Failed to evaluate script!\nevalscript.js:5: SyntaxError: Unexpected identifier\n output:{bands: 2, sampleType:“FLOAT32”}}\n ^^^^^^\n”,“code”:“RENDERER_EXCEPTION”}}”

I haven’t been able to find the source of this error yet, please help me to understand what am I doing wrong as it seems to me very similar to the evaluate script in the doc.

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You have a mistake in the definition of the input in the setup function. See evalscripts in examples for S1 e.g. this one

Try this:

function setup() {

  return {

    input: ["VV", "VH"],

    output: { id:"default", 

              bands: 2,

              sampleType: "FLOAT32"

    }

  }

}

Hi,

I have tried what you suggested (following the example), but I keep getting this error.

evalscript = """
function setup() {
  return {
    input: ["VV", "VH"],
    output: { id:"default", 
              bands: 2,
              sampleType: "FLOAT32"
    }
  }

function evaluatePixel(samples) {
  var vvdB = toDb(samples.VV)
  var vhdB = toDb(samples.VH)
  return [vvdB, vhdB]
}
"""

Server response: “{“error”:{“status”:400,“reason”:“Bad Request”,“message”:“Failed to evaluate script!\nevalscript.js:15: SyntaxError: Unexpected end of input\n}\n^\n”,“code”:“RENDERER_EXCEPTION”}}”

Hi,

The first thing that I can see in your code is that you are missing a closing curly bracket in your setup function. The error actually points to this as it mentions SyntaxError: Unexpected end of input.

It can help to have some form of coding editor that helps with syntax errors to write your Evalscripts.

Hi,

you were right regard the {

but still getting same erro just without the syntax error:

evalscript = """
function setup() {
  return {
    input: ["VV", "VH"],
    output: { id:"default", 
              bands: 2,
              sampleType: "FLOAT32"
    }
  }
 }

function evaluatePixel(samples) {
  var vvdB = toDb(samples.VV)
  var vhdB = toDb(samples.VH)
  return [vvdB, vhdB]
}
"""

Server response: “{“error”:{“status”:400,“reason”:“Bad Request”,“message”:“Dataset with id: 0 not found.”,“code”:“RENDERER_EXCEPTION”}}”

You are using the “SIMPLE” mosaicking (which is by default when not explicitly specified), therefore I suggest you try with sample rather than samples in your evaluatePixel function: ~~there is a difference, see here: https://docs.sentinel-hub.com/api/latest/evalscript/v3/#evaluatepixel-function (samples returns an array).~~ erratum: this is just a naming convention: parameters are positional not named, therefore whatever you put with SIMPLE mosaicking will be an object.

If you keep getting an error despite this change, I would check if there is actually data on the dates you are querying.

just to give some more information-

the flow of the whole script before is that I define date range (in this case lets say from 1/10-10/02), then check if sentinel1 has availabe images with the get_dates() function and then everytime use those dates in order to generate one image per date.

When I use this with another evalscript (one of fusion data for example with sentinel 1) it works no problem (with same dates), so I believe there is still problem with the evalscript (after fixing it to sample as you mentions )

evalscript = """

function setup() {

  return {

    input: t"VV", "VH"],

    output: { id:"default", 

              bands: 2,

              sampleType: "FLOAT32"

    }

  }

}

  

function evaluatePixel(sample) {



return r10 * Math.log((sample.VV)) / Math.LN10, 10 * Math.log((sample.VH)) / Math.LN10]

  

  }