添加多方向山体阴影图层

使用多方向山体阴影图层增强地形表现;

<!DOCTYPE html>
<html lang="en">
<head>
    <title>添加多方向山体阴影图层</title>
    <meta property="og:description" content="使用多方向山体阴影图层增强地形表现" />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@5.5.0/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/maplibre-gl@5.5.0/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const map = new maplibregl.Map({
        container: 'map',
        style: 'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: [-121.66, 44.31],
        zoom: 12
    });

    map.on('load', () => {
        // 添加DEM（数字高程模型）数据源
        map.addSource('dem', {
            'type': 'raster-dem',
            'url': 'https://api.maptiler.com/tiles/terrain-rgb-v2/tiles.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
            'tileSize': 256
        });

        // 添加以DEM为基础的山体阴影图层
        map.addLayer({
            'id': 'hillshading',
            'source': 'dem',
            'type': 'hillshade',
            'paint': {
                // 指定多方向照明
                'hillshade-illumination-direction': 335,
                'hillshade-illumination-anchor': 'viewport',
                // 使用多方向山体阴影（比单一方向更加细腻）
                'hillshade-accent-color': 'hsl(39, 58%, 95%)',
                'hillshade-highlight-color': 'hsl(0, 0%, 100%)',
                'hillshade-shadow-color': 'hsl(45, 45%, 75%)',
                'hillshade-exaggeration': 0.5
            }
        }, 'waterway-label');
    });
</script>
</body>
</html>