Style ocean depth data | Mapbox GL JS

Use the interpolate expression with a cubic bezier curve expression to style bathymetry data.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Style ocean depth data</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
 
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [142.591669, 11.373335],
zoom: 3,
minZoom: 3,
maxZoom: 5
});
 
map.on('load', () => {
map.addSource('10m-bathymetry-81bsvj', {
type: 'vector',
url: 'mapbox://mapbox.9tm8dx88'
});
 
map.addLayer(
{
'id': '10m-bathymetry-81bsvj',
'type': 'fill',
'source': '10m-bathymetry-81bsvj',
'source-layer': '10m-bathymetry-81bsvj',
'layout': {},
'paint': {
'fill-outline-color': 'hsla(337, 82%, 62%, 0)',
// cubic bezier is a four point curve for smooth and precise styling
// adjust the points to change the rate and intensity of interpolation
'fill-color': [
'interpolate',
['cubic-bezier', 0, 0.5, 1, 0.5],
['get', 'DEPTH'],
200,
'#78bced',
9000,
'#15659f'
]
}
},
'land-structure-polygon'
);
});
</script>
 
</body>
</html>