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HTML 

              
                <h1>Effect of different Image Maps in SVG feDisplacement Filter</h1>
<section class="image-wrapper">
        <svg class="image-wrapper__image" width="256" height="256" viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg">
    <defs>
        <style type="text/css">
            .filtered{
                filter: url(#filter);
                }
        </style>
        <filter id="filter" width="1" height="1" x="0" y="0" color-interpolation-filters="sRGB">
            <feImage id="feimage" width="100%" height="100%" x="0" y="0" result="10_MAP" href="https://assets.codepen.io/100347/fedm_identity.png"/>
            <feDisplacementMap id="displacement" in="SourceGraphic" in2="10_MAP" scale="100" xChannelSelector="R" yChannelSelector="B"/>
        </filter>
    </defs>
    <image id="map" href="https://assets.codepen.io/100347/fedm_pattern-a.svg" width="100%" height="100%" class="filtered" />
</svg>
        <section class="image-wrapper__sources" id="viewsource">
            <code class="image-wrapper__code" id="filtercode">
            </code>
            <img class="image-wrapper__map" id="map-preview" width="256" height="256"
                src="https://assets.codepen.io/100347/fedm_identity.png" alt="Preview of displacement-map" />
            <button id="toggleview" class="image-wrapper__toggleview">Show Code</button>
        </section>
    </section>

    <section class="map-scale-wrapper">
        <div class="map-scale-wrapper__value" id="scaleval">scale: 100</div>
        <input class="map-scale-wrapper__scale-range" id="scale" type="range" min="-256" max="256" steps="4" value="100"
            size="50" />
    </section>
    <ul class="map-select" id="thumbs">
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-a" checked="checked" />
            <label class="map-select__label" for="thumb-a">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_identity.png" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Identity Map
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-b" />
            <label class="map-select__label" for="thumb-b">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_distort-100.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Distort -100
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-c" />
            <label class="map-select__label" for="thumb-c">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_distortplus100.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Distort +100
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-d" />
            <label class="map-select__label" for="thumb-d">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_canvas.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Canvas
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-e" />
            <label class="map-select__label" for="thumb-e">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_cracks.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Cracks
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-f" />
            <label class="map-select__label" for="thumb-f">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_crystal.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Crystal
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-g" />
            <label class="map-select__label" for="thumb-g">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_glass.jpg" width="100%" item-height="100%" />
                    <figcaption class="map-select__title">
                        Glass
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-h" />
            <label class="map-select__label" for="thumb-h">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_oceanwaves.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Ocean Waves
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-i" />
            <label class="map-select__label" for="thumb-i">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_oscillation.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Oscillation
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-j" />
            <label class="map-select__label" for="thumb-j">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_polar2circle.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Polar Square to Circle
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-k" />
            <label class="map-select__label" for="thumb-k">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_polar2square.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Polar Circle to Square
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-l" />
            <label class="map-select__label" for="thumb-l">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_raster.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Raster
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-m" />
            <label class="map-select__label" for="thumb-m">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_ripple.jpg" width="100%"
                        item-height="100%" />
                    <figcaption class="map-select__title">
                        Ripple
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-n" />
            <label class="map-select__label" for="thumb-n">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_tiles.jpg" width="100%" item-height="100%" />
                    <figcaption class="map-select__title">
                        Tiles
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-o" />
            <label class="map-select__label" for="thumb-o">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_twirl.jpg" width="100%" item-height="100%" />
                    <figcaption class="map-select__title">
                        Twirl
                    </figcaption>
                </figure>
            </label>
        </li>
        <li class="map-select__thumb">
            <input type="radio" name="radio" id="thumb-p" />
            <label class="map-select__label" for="thumb-p">
                <figure class="map-select__figure">
                    <img class="map-select__image" src="https://assets.codepen.io/100347/fedm_waves.jpg" width="100%" item-height="100%" />
                    <figcaption class="map-select__title">
                        Waves
                    </figcaption>
                </figure>
            </label>
        </li>
    </ul>
    <section class="map-channelselector-wrapper" id="channel">
        <fieldset class="map-channelselector-wrapper__group">
            <span class="map-channelselector-wrapper__title">x-channel selector</span>
            <input type="radio" name="xchannel" id="redx" value="R" checked="checked" data-channel="x" />
            <label class="map-channelselector-wrapper__label--red" for="redx">red</label>
            <input type="radio" name="xchannel" id="bluex" value="B" data-channel="x" />
            <label class="map-channelselector-wrapper__label--blue" for="bluex">green</label>
        </fieldset>
        <fieldset class="map-channelselector-wrapper__group">
            <span class="map-channelselector-wrapper__title">y-channel selector</span>
            <input type="radio" name="ychannel" id="redy" value="R" data-channel="y" />
            <label class="map-channelselector-wrapper__label--red" for="redy">red</label>
            <input type="radio" name="ychannel" id="bluey" value="B" checked="checked" data-channel="y" />
            <label class="map-channelselector-wrapper__label--blue" for="bluey">green</label>
        </fieldset>
    </section>
!

CSS 

              
                @use postcss-preset-env;

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

body {
    margin: 0;
    padding: 1.25em;
    height: 100%;
    color: white;
    font: 0.85em -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    min-width: 320px;
}

p {
    margin-bottom: 1em;
}

.filter {
    position: absolute;
    top: 0;
    left: -1;
    width: 1px;
    height: 1px;
    visibility: hidden;
}

::selection {
    background: #b400ff;
}

input[type='checkbox'],
input[type='radio'] {
    display: none;
}

html {
    height: 100%;
}

body {
    background: #071a2f;
    color: white;
}

h1 {
  font-size: 16px;
  text-align: center;
}

.image-wrapper {
    display: block;
    display: flex;
    justify-content: space-between;
    width: 512px;
    height: 256px;
    margin: 20px auto;
    text-align: center;
}

.image-wrapper__sources,
.image-wrapper__sources--toggle,
.image-wrapper__map,
.image-wrapper__code,
.image-wrapper__image {
    display: inline-block;
    position: relative;
    width: 256px;
    height: 256px;
    background-color: rgba(255, 255, 255, 0.4);
    overflow: hidden;
}

.image-wrapper__map,
.image-wrapper__code {
    position: absolute;
    left: 0;
    top: 0;
    transition: transform 0.3s ease-out;
}

.image-wrapper__code {
    background: black;
    padding: 10px;
    text-align: left;
    white-space: pre-wrap;
    font-size: 11px;
}

.image-wrapper__toggleview {
    display: block;
    position: absolute;
    right: 0;
    max-width: 14em;
    top: 50%;
    transform: translateY(-50%);
    background-color: transparent;
    color: transparent;
    height: 40px;
    line-height: 40px;
    padding: 0 46px 0 6px;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, top 0.2s, padding-right 0.2s, max-width 0.2s;
    outline: none;

    &:hover {
        outline: none;
        background-color: black;
        color: white;
    }

    &::after {
        display: block;
        position: absolute;
        right: 0;
        top: 0;
        width: 40px;
        height: 40px;
        background: black;
        color: white;
        text-align: center;
        font-size: 18px;
        line-height: 40px;
        content: '</>';
        overflow: hidden;
    }

    &:before {
        position: absolute;
        display: block;
        max-width: 0;
        background-color: rgba(255, 255, 255, 0.4);
        color: white;
        height: 40px;
        overflow: hidden;
        right: 0;
        top: 0;
        content: 'show map';
        white-space: pre;
        opacity: 0;
        transition: opacity 0.2s, max-width 0.3s, padding 0.3s;
    }
}

.image-wrapper__sources--toggle .image-wrapper__toggleview {
    bottom: 0;
    background: white;
    max-width: 0;
    top: 240px;
    color: black;
    padding: 0;

    &::before {
        max-width: 114em;
        opacity: 1;
        line-height: 36px;
        padding: 0 6px;
    }

    &:hover::before {
        background-color: white;
        color: black;
    }

    &::after {
        width: 0;
    }
}

.image-wrapper__code {
    left: -100%;
}

.image-wrapper__sources--toggle {
    & .image-wrapper__code,
    & .image-wrapper__map {
        transform: translateX(100%);
    }
}

.map-select {
    display: block;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 512px;
    margin: 0 auto;
    position: relative;
}

.map-select__thumbs {
    display: block;
    position: relative;
    list-style-type: none;
}

.map-select__thumb {
    display: inline-block;
    position: relative;
    width: 60px;
    height: 60px;
    flex: 0 1 60px;
    margin: 0 4px 4px 0;

    &::nth-child(8) {
        margin-right: 0;
    }
}

.map-select__label {
    cursor: pointer;
    display: block;
    position: relative;
    width: 100%;
    height: 100%;
    border: solid rgba(255, 255, 255, 0.75) 0px;
    transition: border-width 0.3s;
}

input:checked + .map-select__label {
  border-width: 2px;
}

.map-select__figure {
    width: 100%;
    height: 100%;
}

input:checked + .map-select__label .map-select__figure {
    width: 56px;
    height: 56px;
}

.map-select__image {
    width: 100%;
    height: 100%;
}

.map-select__title {
    display: block;
    position: absolute;
    padding: 5px;
    font-size: 13px;
    color: black;
    text-align: center;
    left: 50%;
    top: 0;
    width: 70px;
    visibility: hidden;
    opacity: 0;
    transform: translate(-50%, -120%);
    background: white;
    transition: opacity 0.5s, visibility 0.5s;
    transition-delay: 0, 1.3s;

    &::after {
        display: block;
        width: 10px;
        height: 10px;
        background: white;
        position: absolute;
        left: 50%;
        bottom: -8px;
        transform: rotate(45deg) translateX(-50%);
        content: '';
    }

    @nest .map-select__label:hover & {
        opacity: 1;
        visibility: visible;
    }
}

.map-channelselector-wrapper,
.map-scale-wrapper {
    display: block;
    display: flex;
    width: 512px;
    margin: 40px auto;
    position: relative;
    text-align: right;
}

.map-scale-wrapper__value {
    background-color: rgba(255, 255, 255, 0.2);
    width: 162px;
    text-align: center;
    margin-right: 1px;
    padding: 0 0.5em;
    line-height: 20px;
}

.map-channelselector-wrapper {
    justify-content: flex-start;
    align-items: center;
    align-content: center;
    text-align: left;
    height: 36px;
}

.map-channelselector-wrapper__group {
    display: block;
    width: 50%;
    flex: 0 1 50%;
    border: none;
}

.map-channelselector-wrapper__title {
    display: inline-block;
    outline: none;
    margin-right: 8px;
}

.map-channelselector-wrapper__label--blue,
.map-channelselector-wrapper__label--red {
    display: inline-block;
    width: 10px;
    height: 10px;
    border: solid white 1px;
    background: #ff0000;
    text-indent: -100px;
    font-size: 0;
    color: transparent;
    vertical-align: middle;
    margin-right: 8px;
    transition: width 0.2s ease-out, height 0.2s ease-out;
    cursor: pointer;
}

:checked + .map-channelselector-wrapper__label--blue,
:checked + .map-channelselector-wrapper__label--red {
    width: 14px;
    height: 14px;
    cursor: auto;
}

.map-channelselector-wrapper__label--blue {
    background: #0000ff;
}

input[type='range'] {
    display: block;
    -webkit-appearance: none;
    background-color: rgba(255, 255, 255, 0.5);
    margin-top: 0;
    width: 100%;
}

input[type='range']:focus {
    outline: none;
}

input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none;
    background-color: white;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

input[type='range']::-moz-range-track {
    background-color: #ffaa00;
    border: none;
    margin: 0;
    padding: 0;
    outline: 0;
}

input[type='range']::-moz-range-thumb {
    background-color: white;
    width: 30px;
    height: 20px;
    cursor: pointer;
    border: none;
    border-radius: 0;
    margin: 0;
}

input[type='range']::-ms-fill-lower {
    background: #ff3632;
}
input[type='range']::-ms-fill-upper {
    background: #ffaa00;
}
input[type='range']::-ms-thumb {
    background: white;
}
input[type='range']::-ms-ticks-after {
    display: none;
    color: blue;
}
input[type='range']::-ms-ticks-before {
    display: none;
    color: black;
}
input[type='range']::-ms-track {
    padding: 0;
    cursor: pointer;
}
input[type='range']::-ms-tooltip {
    display: none;
}
!

JS 

              
                'use strict';

const toggleButton = document.getElementById('toggleview');
const sourceWrapper = document.getElementById('viewsource');
const codeWrapper = document.getElementById('filtercode');
const feImage = document.getElementById('feimage');
const displacement = document.getElementById('displacement');
const map = document.getElementById('map-preview');
const slider = document.getElementById('scale');
const thumbs = document.getElementById('thumbs');
const scaleVal = document.getElementById('scaleval');
const mapThumbs = document.querySelectorAll('.map-select__image');
const radios = document
    .getElementById('channel')
    .querySelectorAll('input[type=radio]');
const channelSelector = {
    x: 'R',
    y: 'B',
};
let displacementScale = 100;
let mapSrc = 'https://assets.codepen.io/100347/fedm_identity.png';

for(let thumb of mapThumbs) {
  const url = thumb.getAttribute('src');
  
  fetch(url)
  .then((response) => {
      return response.blob();
  })
  .then((blob) => {
      const objURL = URL.createObjectURL(blob);
    
      thumb.setAttribute('src', objURL);
    
      if(/identity/g.test(url)){
        feImage.setAttribute('href', objURL);
        map.setAttribute('src', objURL);
      }
  });
}

for (let i = 0; i < radios.length; i++) {
    radios[i].addEventListener('change', swapChannel);
}

toggleButton.addEventListener('click', toggleCode);
thumbs.addEventListener('click', swapMap);
slider.addEventListener('input', setMapScale, false);
slider.addEventListener('change', setMapScale, false);

function toggleCode(e) {
    let cn = sourceWrapper.className;

    if (/--toggle/gi.test(cn)) {
        cn = cn.replace('--toggle', '');
    } else {
        cn += '--toggle';
    }
    sourceWrapper.className = cn;
}

function updateCode() {
    const code = `<filter width="1" height="1" x="0" y="0" color-interpolation-filters="sRGB">
    <feImage id="feimage"
     width="100%" height="100%"
     x="0" y="0"
     result="10_MAP"
     href="${mapSrc}"
    />
    <feDisplacementMap
     in="SourceGraphic" 
     in2="10_MAP"
     scale="${displacementScale}" 
     xChannelSelector="${channelSelector.x}"
     yChannelSelector="${channelSelector.y}'
    />
</filter>`;

    codeWrapper.innerText = code;
}

function swapChannel(e) {
    const target = e.target;
    const channel = target.dataset.channel;

    channelSelector[channel] = target.value;
    displacement.setAttribute(
        `${channel}ChannelSelector`,
        channelSelector[channel]
    );
    updateCode();
}

function swapMap(e) {
    const target = e.target;

    if (target.src) {
        let src = target.src;
        mapSrc = src.match(/\/([^\/]+)$/g)[0].replace('/', '');
        map.setAttribute('src', src);
        feImage.setAttribute('href', src);
    }

    updateCode();
}

function setMapScale(e) {
    displacementScale = e.target.value;
    displacement.setAttribute('scale', displacementScale);
    scaleVal.innerHTML = 'scale: ' + displacementScale;
    updateCode();
}

updateCode();
!
999px

Console