Negative value of ndwi

Good morning,

I calculated the value of index of ndwi and the result is negative.
The value should be positive. (not all of date for example date 31/08/2022). I want to know if it is normal.
I attached the python code and result of index.
Geometry: [-5.7580946, 37.3905082], [-5.7579981, 37.3903292], [-5.7585989, 37.3902355], [-5.7585453, 37.3893489], [-5.7583629, 37.3886755],[-5.7573811, 37.3887778], [-5.7565442, 37.3910112], [-5.7580946, 37.3905082]

evalscript = “”"
//VERSION=3
function setup() {
return {
input: [{
bands: [“Green”, “NIR”],
units: “DN”
}],
output: {
id: “default”,
bands: 1,
sampleType: SampleType.FLOAT32
}
};
}

    function evaluatePixel(sample) {
        var ndwi = (sample.Green - sample.NIR)/(sample.Green + sample.NIR);
        return [ndwi];
    }
    """

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Hi @antonio.santos.rodri ,

NDWI can vary between -1 to +1 in general, depending on the plant water content, the vegetation type, and land cover. The negative value indicates that the area is under water stress.

Here is a documentation from European Commission which briefly summarise NDWI and the interpretation of values. You could also find more information about NDWI online.