script.js

//VERSION=3
// To set custom max and min values, set
// choose your max and min values. 
// The color map will then be scaled
// to those max and min values
const max = 9000
const min = -12000

function setup() {
    return {
        input: ["DEM", "dataMask"],
        output: { bands: 4, sampleTYPE: "AUTO" },
    };
}

const map = [
    [9000, 0xffffff],
    [7000, 0xdcefff],
    [5000, 0xbdc7f9],
    [3000, 0x9faaef],
    [1000, 0x788bb4],
    [500, 0x8b6d00],
    [400, 0xd292b4],
    [300, 0x78385a],
    [200, 0xaa5f00],
    [50, 0x8b4b28],
    [30, 0x782d28],
    [10, 0x63383b],
    [0, 0xc7c7c7],
    [-10, 0x9f9fff],
    [-20, 0x7878eb],
    [-50, 0x5a54f9],
    [-200, 0x3b50f5],
    [-500, 0x3b3be6],
    [-1000, 0x2831b4],
    [-6000, 0x1e1e78],
    [-9000, 0x1e005a],
    [-12000, 0x000028],
];

const visualizer = new ColorRampVisualizer(map, min, max);

function evaluatePixel(sample) {
    let val = sample.DEM;
    let imgVals = visualizer.process(val)

    // Return the 4 inputs and define content for each one
    return [...imgVals, sample.dataMask]
}