Good day I recently changed my Evalscript for downloading S1 GRD images and since the change my PU usage has gone up exponentially. See below the Evalscript before the change:
evalscript = """
//VERSION=3
function setup() {
return {
input: [
{
bands: ["VV","VH"],
}
],
output: [
{
id: "default",
bands: 2,
sampleType: "FLOAT32",
noDataValue: 0,
},
],
mosaicking: "SIMPLE",
};
}
function evaluatePixel(samples) {
// Your javascript code here
return {
default:[samples.VV, samples.VH],
};
}
function updateOutputMetadata(scenes, inputMetadata, outputMetadata) {
// Write your code here
}
function preProcessScenes(collections) {
return collections;
}
"""
See below the changed Evalscript which increased the PU usage, on the documentation it says dataMask does not count as a band.
evalscript = """
//VERSION=3
function setup() {
return {
input: [
{
bands: ["VV","VH","dataMask"],
}
],
output: [
{
id: "default",
bands: 2,
sampleType: "FLOAT32",
noDataValue: 0,
},
],
mosaicking: "ORBIT",
};
}
function evaluatePixel(samples) {
// initial variables as the noDataValue
let mosaic_vv = 0;
let mosaic_vh = 0;
// initial self-defined dataMask as 0 which means no data
let mosaic_dataMask = 0;
// for each pixel we check all available acquisitions and select the one having data
for (let i = 0; i < samples.length; i++) {
if (samples[i].dataMask === 1) {
mosaic_vv = samples[i].VV;
mosaic_vh = samples[i].VH;
mosaic_dataMask = 1;
}
}
return {
default:[mosaic_vv, mosaic_vh, mosaic_dataMask],
};
}
"""