Wrong EVI values | Planet Community

Hello, i’m getting 0 to 250 tiff values when I run this Layer script in QGIS.

What should I add to get -1 to +1 values as index?

Regards

//VERSION=3

function evaluatePixel(samples) {

let val = 2.5 * (samples.B08 - samples.B04) / (samples.B08 + 6 * samples.B04 - 7.5 * samples.B02 + 1);

return nval, samples.dataMask];

}

function setup() {

return {

input: :{

bands: :

“B02”,

“B04”,

“B08”,

“dataMask”

]

}],

output: {

bands: 2

}

}

}

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Hi ihernandez,

to get values between -1 and 1 you need to specify sampleType: "FLOAT32". E.g.:

//VERSION=3



function evaluatePixel(samples) {

	let val = 2.5 * (samples.B08 - samples.B04) / (samples.B08 + 6 * samples.B04 - 7.5 * samples.B02 + 1);

	return [val, samples.dataMask];

}



function setup() {

	return {

		input: [{

			bands: [

				"B02",

				"B04",

				"B08",

				"dataMask"]

		}],

		output: {

			bands: 2, 

    		sampleType: "FLOAT32"

		}

	}

}

More info in the SH documentation: sampleType

I am not sure how exactly you are using this in Qgis. To get float values you might need to add a WCS layer.

Thanks it worked! I work always with WMS and its fine. I don’t know whats the different between WCS and WMS. In QGIS I use the Plugin to search for images and download from there.

Regards. Jose